awesome science experiments for 7th graders

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MICHAEL WILLIAMS

U.n.c. reports declines in black and hispanic enrollment, educationusa higher education fair 2024, internationalisation experts debate approaches to war in gaza, campus sustainability, research and teaching excellence, smart space optimization, these are the 2 students and 2 teachers killed at apalachee high school in georgia, what research says about preventing school shootings, here’s how you can save for higher education, 43 of the best 7th grade science projects and experiments.

Are you looking for science activities to do with your 7 th graders? No sweat. We have you covered. Check out our list of 43 science projects and experiments that you can try with your 7th graders this month.

• Yeast Metabolism with and without Aeration | Sciencebuddies.org – Grades 6-8 Biology experiment that evaluates the effects of glucose metabolism in yeast.
• Aspirin Absorption in Carbohydrate Solutions | All-Science-Fair-Projects.com – Grades 6-8, Does aspirin absorb into the bloodstream quicker if taken with a carbohydrate food? Test aspirin dissolution in an assortment of carbohydrate solutions.
• Bacteria and Toothpaste | All-Science-Fair-Projects.com – Grades 6-8, Do you know which toothpaste cleans your teeth best? In this project, you will row bacteria from your recently brushed teeth in petri dishes to find out the answer.
• Making Batteries from Fruits and Vegetables | Sciencebuddies.org – Grades 4-7, Use veggie power to build a simple battery from a variety of vegetables. Which ones are the most powerful?
• How Do Roots Grow When the Direction of Gravity Changes? | ScienceBuddies.org -Grades 6-10, Plants respond to gravity by stems that grow upward and roots that grow downward. Experiment with germinating seeds and rotate them to make up down and down up. How do you think the growing seedlings will respond?
• Hydroponics vs. Soil Growth | All-Science-Fair-Projects.com – Grades 6-8, In this project, students find out if plants grow better in soil or a hydroponic solution.
• Puppy Proportions: Your Dog’s Early Months | Sciencebuddies.org – Grades 6-8, Find out how a puppy’s weight, growth, and proportions change early in their lives.
• Do Migratory Birds Like It Hot? | Sciencebuddies.org – Grades 6-8, Pick a species of bird and determine if there is a correlation between air temperature and where and when the birds migrate.
• That’s a Real Smile! …or is it? | ScienceBuddies.org – Grades 6-8, Can people tell the difference between a fake smile and a real one? Gather information from dozens of volunteers to find out.
• Build a Raft Powered by Surface Tension | Sciencebuddies.org – Grades 6-10, Learn about the properties of surface water tension, and use it to propel a raft.
• Paw Preference in Pets | Sciencebuddies.org – Grades 7-10, Are animals left-handed or right-handed like humans?
• Bat Detector: Listen to the Secret Sounds of Bats | Sciencebuddies.org – Grades 7-10, Study the behavior of bats to find out how do they use echolocation to catch their prey
• Saving Migratory Animals | ScienceBuddies.org – Grades 7-10, They’re here today but could be gone tomorrow. Examine the migratory path of a bird species and the similarities and differences between their winter and summer habitats. Recommend which locations should be preserved to protect these species.
• Which Metal Is the Most Resistant to Corrosion? | Sciencebuddies.org – Grades 6-8, Test several kinds of metal exposed to the air, tap water, and saltwater to determine which are the most resistant to corrosion, and which substances are the most corrosive to them.
• Ionizing vs. Photoelectric Smoke Detectors | All-Science-Fair-Projects.com – Grades 6-8, Learn how smoke detectors work, and compare the effectiveness of ionizing smoke detectors to photoelectric smoke detectors.
• Robot Movement | Education.com – Grades 6-8, Construct a robot equipped with sound/touch sensor circuitry. Run it through a maze to find out if it displays sequential or random movement.
• Repurposed Designs | Education.com – Grades 6-8, Identify items that need repurposing such as e-waste, batteries, and mattresses. Then get creative and Invent your own original repurposed design.
• Solar-Powered Robot Bug | Sciencebuddies.org – Grades 6-8, Explore electronics and solar energy by building the Frightened Grasshopper, a solar-powered bug.
• Stressed Out with Beams | Sciencebuddies.org – Grades 6-8, Test the load-bearing capacity of several types of beams, including I-beams, U-beams, rectangular beams, and T-beams.
• Build a Gauss Rifle | ScienceBuddies.org – Grades 6-8, Use magnets and ball bearings to build a rifle based on magnetism. Investigate how many magnet and ball bearing “stages” affect the velocity and distance of the projectile.
• Smart Medicine Cabinet | ScienceBuddies.org – Grades 6-8, Do you know someone who needs to take medication daily? Create a sensor that reminds patients when to take their medication.
• electromagnet?
• Grow the Best and the Largest Crystals | Sciencebuddies.org – Grades 6-8, Figure out the best temperature for making the largest, purest crystals using water and borax.
• What’s the Fastest Way to Cool a Soda? | ScienceBuddies.org – Grades 6-8, Experiment with different ways to cool a can of soda.  Find out the fastest way to get your tall cold drink.
• How Much Potential Energy Do Different Nuts Have? | Education.com – Grades 6-8, Explore the energy of living things. Prove that different varieties of nuts produce electricity in a series of experiments.
• How Salty Does the Sea Have to Be for an Egg to Float? | ScienceBuddies.org – Grades 6-8, Figure out precisely what concentration of salt in water is required to make an egg float.
• Washing Detergent & Hydrophobic Soil | Education.com – Grades 6-8, Some soils do not absorb water very well.  Find out why and if washing detergent and change their ability to absorb water.
• Make Your Own Psychrometer | Sciencebuddies.org – Grades 6-8, Make a psychrometer to measure relative humidity, then use it to measure RH in a variety of weather conditions.
• Do Our Storm Drains Keep the Ocean Trash Free? | ScienceBuddies.org – Grades 6-8, Test your local grated storm drain inlets to see if they’re up to the task of keeping plastic litter out of your community’s stormwater drainage system. If they’re not, work on improving the design.
• Can Water Float on Water? | ScienceBuddies.org – Grades 6-8, Can liquid water float on liquid water? Investigate how the density of water is affected by its temperature and salinity.
• What Weather Factors Create Radiation Fog? | Sciencebuddies.org – Grades 6-8, Make systematic observations about the weather conditions needed to create radiation fog. Can you forecast when and where it will occur?
• The Science Behind Tsunamis | Sciencebuddies.org – Grades 6-8, Study the effect of water depth on wave velocity. Learn how tsunamis form and create your own simulation model wave tank to generate a tsunami.
• Killing ‘Vampires’: Saving Money and Power | Sciencebuddies.org – Grades 6-8, In this project, you’ll identify electricity “vampires” in your home, such as computer peripherals and electronic equipment, that use power even when not in use. Find out exactly how much energy they use. Use this eye-opening data to help your family save money on electricity.
• Which Wheels Work Best? | Education.com – Grades 6-9, Experiment with how different kinds of wheels affect the speed of a skateboard.  You’ll calculate friction co-efficient and its correlation to velocity.
• Test the Efficiency of a Solar Cell? | Education.com – Grades 6-9, Find out how much of the energy from the sun that reaches a photovoltaic cell is changed over into electricity.  Predict how to position solar cells for maximum conversion.
• How Acidic Waters Make Rocks Disappear | Sciencebuddies.org – Grades 6-10, Soak some limestone rocks in varying amounts of acidic water.  Determine how much acidity is needed to make them dissolve.
• Seafloor Spreading | Education.com – Grades 6-12, Use an oatmeal box and some paper to demonstrate seafloor spreading.
• Storytelling Alice | Sciencebuddies.org – Grades 6-12, Create your own computer-animated story using Carnegie Mellon’s 3D programming software. You’ll learn computer programming with easy-to-use drag and drop tools.
• Modeling Darcy’s Law | Education.com – Grades 6-12, Model the underground movement of water, utilizing Darcy’s Law.
• Globular Clusters | Sciencebuddies.org – Grades 7-10, Explore “star gangs” in the Milky Way and beyond. Globular cluster are compact groups of about a million stars that move around in galaxies. Use statistical data to learn how globular clusters help us better understand the universe.
• Demonstrating the Separation of Mixtures | Education.com – Grades 7-10, Separate recycled objects to illustrate how mixtures are created.
• Customize Your Own Drum Set! | ScienceBuddies.org – Grades 7-10, Build a drum set using household materials, a computer, Scratch, and a PicoBoard. Program your drum set to create a synthesized Hip hop, rap, classical, techno, or electronic drumbeat.
• Harmful Algal Blooms in the Chesapeake Bay | Sciencebuddies.org – Grades 8-12, Harmful algal blooms affect the quality of water and impact people, marine animals, and birds. Study how water quality changes before, during, and after algal blooms.

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Science Fair Ideas for 7th Grade – 60 Perfect Projects

June 27, 2024

If your 7th graders are preparing for the science fair, it’s possible that you’re looking for some ideas to get them started. With these 7th grade science projects, your students will be sure to feel inspired and ready to begin. These science fair ideas for 7th grade include projects related to biology, health & psychology, environmental science, chemistry, physics, and engineering.

Things to consider – Science fair ideas for 7th grade—60 perfect projects

Each of these projects is ranked according to “difficulty” and “materials.” You can consider these rankings as you decide which to share with your 7th grade students.

Difficulty : How advanced is the project? Do your 7th graders have enough time to complete it? Each project is rated “basic,” “medium,” or “advanced” based on the complexity of the concept and the amount of time it will take.

Materials : These projects also range in terms of the complexity of the materials and setup, and are ranked as “basic,” “medium,” or “advanced.”

Biology – Science Fair Ideas for 7th Grade—60 Perfect Projects

1) extracting dna from onions.

  Can DNA be studied separately from other cell components? In this experiment, students creatively use a variety of household supplies to learn more about DNA, an important biology concept.

• Difficulty: advanced
• Materials: advanced
• Learn more: onion DNA extraction

2)  Grow box design

  Build a grow box (or series of grow boxes) for plants using cardboard, foil, and a plug-in light source. Students can test the effectiveness of the grow box when variables are changed, such as light source strength and box size. After this experiment, your students can invite plants into their homes or the classroom all winter long.

• Difficulty: medium
• Materials: medium
• Learn more: DIY grow box

3) Collect biofilm

  Biofilm is comprised of microscopic bacteria accumulating on objects in the water (you might notice it rivers, swimming pools, or even on the surface of teeth). Students can quantify biofilm by building a collector. They can also experiment with ways to reduce it.

• Learn more: biofilm experiment

Science Fair Ideas for 7th Grade – 60 Perfect Projects (Continued)

4) plants and phototropism.

  Do plants really grow towards light? Discover more about how plants respond to light through this simple experiment.

• Difficulty: basic
• Learn more: phototropism

5) Nitrogen and plants

Explore the important role of nitrogen in plant growth with this science fair project. The experiment involves comparing the growth of pea plants with and without nitrogen-fixing bacteria.

• Learn more: nitrogen and pea plants

6) Bubble cell membranes

  If you’re looking for a fun way to teach 7th graders about cell membranes, consider using bubbles. Through this lab, students investigate the behavior of bubbles and apply it to cell membrane characteristics.

• Learn more: cell membrane bubble lab

7) Test Darwin’s theory

  With this lab, students repeat Darwin’s “survival of the fittest finch” experiment for a fun and interactive way to learn about natural selection and evolution.

• Learn more: natural selection lab

8) Carbon cycle experiment

  Help your 7th graders learn about processes of photosynthesis and respiration through this project that combines biology and chemistry concepts.

• Learn more: carbon cycle experiment

9) Test for germs

  What’s the dirtiest place in the kitchen? The refrigerator handle? The coffee machine? The sink? Students can guess, though it might not be what they think. Swab household items and store the samples over several days to find out.

• Learn more: germ experiment

10) Cell size lab

  In this project, students can analyze surface-area-to-volume ratios using beets and bleach, demonstrating how small cells are more efficient at moving materials in and out.

• Learn more: cell size lab

Health and psychology – Science Fair Ideas for 7th Grade

11)  colors and memory.

  Find out how color affects memory by asking volunteers to recall simple words on differently-colored construction paper.

• Materials: basic
• Learn more: color influencing memory

12) Measuring tooth decay

  Since eggshells share similar properties to teeth, your students can use them to test how different beverages erode tooth enamel. This project teaches biology concepts while also encouraging healthy eating and dental care.

• Learn more: tooth decay egg experiment

13) Cooking and Vitamin C

  Do cooked fruits and vegetables have less Vitamin C than raw ones? This is another good experiment for your students interested in nutritional science. This project involves a slightly more complex procedure, so it’s also perfect for your advanced 7 th grade students.

• Learn more: Vitamin C determination

Science Fair Ideas for 7th Grade (Continued)

14) caffeine and typing.

  Does a jolt of caffeine help you work more efficiently? Test this out through typing with this 7 th grade science experiment. Your 7 th grade students can run this test with mild forms of caffeine, such as soda or a piece of chocolate.

• Learn more: caffeine and typing

15) Psychology and texting language

  If you teach 7 th graders, you may have heard them speaking in texting-speak. Have these texting abbreviations become a full language? With this project, your 7 th grade students can create a text-language glossary and study its practical applications.

• Learn more: is texting a new language?

16) Test calorie counts

  Where does the calorie number on packaged foods come from? Try this experiment with a variety of foods to help your students understand how food energizes us.

• Learn more: test calorie counts

17) Balloon lung capacity

  Using a balloon and a tape measurer, students can measure lung capacity, which has a number of health implications. It can be made more or less complicated depending on the measurements taken (circumference vs. volume of the balloon, for example).

• Learn more: measuring lung capacity

18) Myers-Briggs and memory

  Are your students interested in exploring questions of psychology and memory? This experiment involves asking volunteers to take a Myers-Briggs personality test, followed by a simple memory exam. They only need internet access and willing volunteers.

• Learn more: memory and personality

19) Flexibility experiment

  There are a number of reasons for stretching, including reducing chances of injury and feeling calmer. But does stretching actually make us more flexible? Find out by comparing flexibility before and after stretch exercises. Students can test volunteers after holding the stretches for different lengths of time.

• Learn more: flexibility experiment

20) Sleep and memory

  Can sleep deprivation affect memory? Your students can find out by quizzing volunteers on trivia studied beforehand after 8 or 5 hours of sleep. While this project takes some planning, organization, and willing volunteers, it’s a fun way to promote healthy sleep habits.

• Learn more: sleep and memory

Environmental science – Science Fair Ideas for 7th Grade

21) water filtration.

Create a charcoal filter in order to better understand water filtration systems. Afterwards, students discuss the science behind clean drinking water, as well as its environmental implications.

• Learn more: charcoal water purifying experiment

22) Acid rain and plant life

  Does acid rain negatively affect plants? Students can test this environmental concern using vinegar. Advanced students can also experiment with different pH levels for a more complex project.

• Learn more: acid rain experiment

23) Ocean acidification

  For another project related to acidification, students can make stimulated ocean water and test its effects on seashells.

• Learn more: ocean acidification lab

24) Test the greenhouse effect

  Though the greenhouse effect can help planet Earth to stay at a livable temperature, it also causes harmful global warming when enhanced by excess greenhouse gases. With this model, students can see the greenhouse phenomenon in action, and discuss how humans could reduce greenhouse gas emissions.

• Materials: simple
• Learn more: greenhouse effect experiment

25) Grow garbage plants

  Grow plants using different kinds of compost and garbage to see which kind of matter facilitates the quickest growth. This project is a great way to teach about composting and sustainability.

• Learn more: growing plants in garbage

26) Water cycle bags

7th grade students can learn more about the water cycle with only a Ziploc bag, food coloring, water, and a marker. Once these water cycle bags are created, they can be hung by a window and checked throughout the following days. Students can observe and record a miniature water cycle happening before their eyes. For more complexity, they can check it at different temperatures.

• Learn more: water cycle bags

27) Glacier ice-cutting

For a demonstration of how glaciers melt from pressure, try this ice-cube-cutting experiment. Mix it up by timing the process with differently sized ice-cubes and weights.

• Learn more: ice cube vs. wire

28) Water quality testing

  A simple water testing kit opens numerous possibilities for science fair projects, including testing the water quality of local streams, ponds, swimming pools, and drinking-water taps. If students don’t have water testing kits on hand, they can purchase them for under $30. This is a perfect way to teach about the importance of clean water sources.

• Learn more: water quality experiment

29) Algae growth

  Teach students about fertilizer runoff and its harmful impacts on local waterways through this experiment, which has students test the effects of pollutants on algae growth using household fertilizers.

• Learn more: algae and pollution

30) Bird watch

  Project FeederWatch is perfect for students who might take an interest in ornithology. It only involves putting a bird feeder outside and recording the number of visitors. For more complex studies, students can take on Feeder Design Challenges .

• Learn more: bird feeding with Project FeederWatch

Chemistry – Science Fair Ideas for 7th Grade

31) slime design.

  Chances are, you already know that middle school students love slime. Turn the fascination into a learning activity by experimenting with chemical properties to create the best slime.

• Learn more: how to make slime

32) Mummify a hot dog

  Students can understand the chemical processes involved in mummification by completing this simple experiment.

• Learn more: hot dog mummification

33) Eggshell chalk

Your 7th graders can make their own sidewalk chalk by using the calcium in eggshells. They can change variables (flour type, water temperature, etc.) to see which chalk is the most long-lasting or water-resistant.

• Learn more: make your own eggshell chalk

34) Homemade ice cream

  The secret to making ice cream is to lower the freezing point of ice. The secret to this secret? Salt. With this experiment, students can have delicious vanilla ice cream ready in about 20 minutes. Test different ingredients for the creamiest results.

• Learn more: homemade ice cream

35) Saltwater and density

Explore salinity by making an egg float or sink in water with various salt levels. You can base your salt levels on notorious salty bodies of water such as the Great Salt Lake (6-27% salt water) and the Dead Sea (34% salt water).

• Learn more: egg float science experiment

36) Oxidation experiment

  Ever wondered how to slow or prevent rusting? Rusting occurs through a process of oxidation, which can be slowed using different liquids. Test how saltwater, freshwater, and other liquids affect oxidation on common metal objects (paper clips, staples, coins, etc.)

• Learn more: does it rust?

37) Static water bending

  Change the flow of water just by combing your hair and then holding it next to a stream of water. How far can you bend the water by combing your hair for different lengths of time? This is a great way to help 7th graders understand static electricity.

• Learn more: bending water experiment

38) Blow bubbles

  Yes, bubble-blowing can be a science fair project. Ask your students to test how temperature affects bubble life through this fun experiment.

• Learn more: bubble life and temperature

39) Red cabbage pH indicator

  Explore chemistry by testing the pH of liquids such as vinegar, milk, and coffee. You’ll need cups and bowls, and of course, red cabbage.

• Learn more: red cabbage indicator experiment

40)  Plate coins with copper

  Create copper-plated coins by extracting copper from a solution, through processes of electrolysis and electroplating . This is a fun way to combine chemistry and electrical engineering.

• Learn more: copper plated coins

Physics Projects – Science Fair Ideas for 7th Grade

41) balloon temperature.

  Using this simple and visual balloon experiment, students can better understand how air expands when heated, a basic component of thermodynamics.

• Learn more: balloon temperature experiment

42) Floating tea bags

  To teach your students about heat and its effects on air molecules, give them this tea bag experiment. Since this project involves fire, you should make sure your students have adult supervision while conducting the experiment. It’s also great for a class demonstration.

• Learn more: floating tea bags

43) Build a parachute

  7th graders can learn about speed, velocity, and acceleration by crafting their own parachutes. They can use different bag materials to test for a smooth fall and graceful landing.

• Learn more: build a parachute

44) Solar-powered oven

Teach your students about thermal energy, reflection, and convection through this fun project. Test the oven on a warm sunny day for delicious results (s’mores).

• Learn more: build a solar oven

45) Swing a glass of water

  This is a great way for 7th graders to learn about centripetal force. The goal is to swing glasses of water over their heads without spilling the water (we recommend doing this experiment outside since it has the potential to get messy).

• Learn more: centripetal force experiment

46) Instant ice

  Through this experiment, your students can experiment with instant ice. For variations, try leaving the water in the freezer for different times, or using other liquids.

• Learn more: instant ice experiment

47) Rainbow density tower

  Teach about density using this simple project with a beautiful outcome. Once students have created their density towers, they can test the density of other objects ty tossing them in (how far will a coin sink? A peanut? An egg?)

• Learn more: density tower

48) Separate hot and cold water

  For another density-related experiment, try separating water by temperature. Students can run the test with the hotter (less density) on the bottom and colder (more density) on the top, and then vice versa.

• Learn more: separating hot and cold water

49) Physics of sound

  It turns out that sound has physical matter. Students can demonstrate this by blowing out a candle using only sound vibrations, which move through an oatmeal box.

• Learn more: discovering sound matters

50) Graphite circuit

  For another electricity-focused experiment, challenge your students to create an electrical circuit using pencil graphite. Since it involves drawing, students can put their art skills to use for a beautiful result.

• Learn more: graphite circuit

Engineering Projects – Science Fair Ideas for 7th Grade

51) pet auto-feeder.

  For a more advanced project with practical application, have your students build this automatic pet feeder. Some coding is involved, which could interest your computer-engineering-oriented students.

• Learn more: auto-feed your pet from anywhere

52) Balloon-powered car

  To help your students learn about engineering design and kinetic energy, suggest that they build a balloon car out of materials likely found around their homes. They can experiment with different wheel and balloon sizes to see how fast the car can go.

• Learn more: Newton’s balloon car

53) Build a geodesic dome

A geodesic dome is a thin-shell structure created out of triangular elements, which help it to withstand heavy loads. This experiment utilizes geometry concepts and it only requires paper and masking tape (students can play with different types of paper and tape as variables).

• Learn more: geodesic dome

54) Da Vinci’s bridge

  This bridge-building project is inspired by Leonardo da Vinci’s self-supporting wooden bridge. Your students will only need pencils and rubber bands (not to tie the pencils together, but to make sure they don’t slip). Test the bridge with different objects to see how much weight it can take.

• Learn more: Da Vinci’s bridge

55) Tensegrity structure

  Understand the mechanics of tension by making this functional floating structure that’s mind-boggling to look at. You will need string, popsicle sticks, and some patience for exact measurements.

• Learn more: anti-gravity structure

56) Make a water clock

  In this engineering project (which has been around since ancient times), students can create a clock from plastic cups, a small bell, yarn, and several other common craft items.

• Learn more:   water clock

57) Design a pinball machine

  Your 7th grade students can create functioning parts for a homemade pinball machine using objects found at home or in the classroom. They can test for speed and materials as they craft their own game.

• Learn more: homemade pinball

58) Rubber band helicopter

Students can learn about helicopter mechanics by constructing this flying and rubber-band-powered toy.

• Learn more: rubber band helicopter

59) Crash cars

This experiment involves building cars and then crash-testing them with raw eggs inside as “passengers.” What structures best protect the egg? Beware: this one could get messy.

• Learn more: car crash project

60) Build an electricity generator

  For another electrical engineering project, students can create an electric generator. Challenge them to test the generator using different materials for different results.

• Learn more: energy generator

Final thoughts – Science Fair Ideas for 7th Grade

Hopefully your 7 th grade students will find projects to get excited about from this list. For more classroom resources applicable to middle school students, we recommend the following articles:

• 124 Good Icebreaker Questions for Students/Adults
• 141 Fun, Weird, & Interesting Facts
• 102 Fun Last Day of School Activities
• 56 8 th Grade Science Fair Projects
• 100 Best Quotes About Education & Teachers
• 150 Journal Prompts for Kids, Middle & High School Students
• 151 Best Summer Jobs for Teachers
• Teacher Tools

Sarah Mininsohn

With a BA from Wesleyan University and an MFA from the University of Illinois at Urbana-Champaign, Sarah is a writer, educator, and artist. She served as a graduate instructor at the University of Illinois, a tutor at St Peter’s School in Philadelphia, and an academic writing tutor and thesis mentor at Wesleyan’s Writing Workshop.

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All Science Fair Projects

1000 science fair projects with complete instructions.

72 Science Projects for 7th Graders

Looking for engaging science fair projects for a middle school science fair? Our handpicked collection of science fair projects for 7th graders is a great place to start!

7th Grade Science Fair Project FAQ

What are some easy 7th grade science fair projects.

Each of these science fair projects are easy for seventh grade science students do. Explore how glow-in-the-dark sticks work, discover how far apart planets really are, and make your own geode crystal with borax!

Chocolate Asphalt

Making Lightning in a Pan

Glow Sticks: Temperature Effects

Geode Rock Borax Crystal

Does Cooking Deplete Vitamin C?

Solar System Scale Model on the Sidewalk

Color and Taste

Uncovering Fall Colors

Growing Mold

Carbonation and Packaging

Science fair project details right above the FAQ!

What is the best 7th grade science project ever?

We love the Fast Food Nutrition project for seventh grade science students. This project encourages students to look more closely at the nutritional value of fast food that's easily available. This project is not only a research project on fast food nutrition, but it also gives middle school students the opportunity to interview willing test subjects about their eating habits.

If you're looking for more 7th grade science projects, check out the 7th grade science fair projects at the top of this page! 

Check out more Best Science Fair Projects →

What are some cool 7th grade science fair projects?

Get ready to be amazed by these super cool science projects for 7th graders! With just a few simple materials, students fascinated by the solar system, how things glow-in-the-dark, unexpected chemical reactions and more, will have too much fun!

Glowing in the Dark

Make Plastic from Milk

The Dissolving Meat Myth

What are 5 testable questions for 7th grade?

A testable question is a question that we can answer through a science experiment. To do this, we do a control science experiment, then we change one thing in the experiment to see how it affects what happens. This is how we can discover the answer to our question!

Here are some testable questions that our seventh grade science projects investigate.

Do detergents affect plant growth?

Can drink and food taste different just by changing its color?

Does the color of light affect photosynthesis?

Does temperature affect seed sprouting?

What makes popcorn pop?

Here are more testable questions along with their science projects →

What are the top 10 science projects for 7th grade?

These are our top 10 science projects for 7th grade, covering biology, chemistry, physics and engineering. Find out how sugary drinks affect teeth, make electricity with your own body or test your design and engineering skills by making a foil bug walk on water! These projects can be used as science fair project ideas or as a fun experiment!

Hamsters and Time of Day

Plant Density and Growth Rate

Water Strider Challenge: Make a Bug Walk on Water!

Human Body Battery

Left-Handedness and Mirror Writing

Making Antibubbles

Soil as an Electrical System

Tooth Decay Experiment with Eggs

Science project details right above the FAQ!

Can I do a 7th grade science fair project in a day?

Yes! Quick experiments or making a model can be a great option for a science fair project! If you want to do a quick science fair project, we have science project ideas on various topics to get you started.

The Solar System: See it in the correct scale!

Create your own sidewalk chalk solar system model and take a walk through space! Solar System Scale Model on the Sidewalk

Chromatography reaction: Separating out colors!

Have you ever wondered why leaves change color in the fall? Let's find out by in this chemistry experiment using chromatography to separate the colors of a green leaf! Uncovering Fall Colors

Heat reactions: Heat speeds things up!

Does the temperature of a room affect how quickly a candle burns? Burn Rate of a Candle

What are some hands-on ways to find inspiration for my science fair project?

There may be free admission days or free passes to a science museum near you! Check your local library for free museum passes, nearby science museums for free entrance days and your credit card for offers.

Find a science museum near you and prepare to be awed by all that you can learn there! I always learn something new and am inspired whenever I go to a science museum!

How do I start a science fair project?

What should I do after I have a science fair project idea?

How do I make a science fair board?

What is the scientific method?

What is the engineering design process?

Where can I find a science fair competition?

The www Virtual Library: Science Fairs website also has a collection of science fairs from all over the world, as well as national, state, regional, local, and virtual competitions!

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30 Ideas For 7th Grade Science Fair Projects

By Beth Roberts | Last Updated May 4, 2022

We’ve compiled some of the best seventh grade science fair projects for your convenience! These science fair project ideas for 7th graders are sure to get you inspired and ready to do go on your own amazing research. We’ve also provided a list of resources you can use at home or in the classroom that will help give you tips on how to start your project, how to present it, and how to write an awesome science fair paper.

1. Drive A Balloon-Powered Car

This is an easy to build science fair project that you can even do with your younger brothers and sisters. You will need a high-quality balloon, scissors, tape, paperclip and a ruler.

First you will want to cut off the end of the balloon just above where half of it already has a hole in it. Then thread the tape through the hole so that it is on one side and stick the paperclip through it (close to the bottom of the balloon). Now take your ruler and measure how long it is going to be. When measuring however, you have to make sure that you are going to cut past where half of your paperclip is.

2. Make A Bionic Hand

This project involves making a bionic hand out of rubber and plastic parts and will involve cutting, gluing and soldering. You will want to be careful when cutting this project as you can seriously injure yourself if you cut too close to the plastic so make a good outline before doing it. First you will want to find out how big your hand is going to be. Then draw that on the rubber sheet with a pencil (minus the thumb where it will be). Measure how long your hand is going to be from top to bottom then measure 1/4″ from all 4 sides (you want 4 measurements).

3. Do An Experiment On The Physical Properties Of Water

This seventh grade science fair project assumes you already know some things about the physical properties of water. You will want to do this experiment with a partner who also knows some things about water. First you will want to find out whether or not your partner is willing to do this experiment with you and then measure out how many 1/2 cups of water there are in a gallon. Then take a sample of that and measure it again, this time in 1/4 cups. Then you will want to find out how many 4 oz cups are in your sample, then 1 cup and then 2 cups. Now take your results and do what is called an average of those measurements in a data table like this.

4. Make A Tornado In A Bottle

This project is somewhat easy but it may take some time to get right . You will want to do this by yourself as you can be seriously injured if you do the wrong thing. First you will want to take your empty soda bottle and rinse out all of the soda from it. Then make sure there is no water left in the bottle from rinsing it then soak it in water for about 20 minutes. After your 20 minutes are up, shake the water out of the bottle, but make sure you leave enough that it will not leak out as soon as you put in your dry ice (if you use dry ice).

5. Sorting Jellybeans is a Fun way To Learn about Heredity.

Use the following pointers to sort jellybeans :

a. Jellybeans come in blue, yellow, orange and pink jellybean colors (you can use colored paper and a different color of pen)

b. Jellybeans are round (you can use a ruler)

c. The outside edge of each jellybean is the “seam” that runs down the middle of the jellybean (you will be able to see this clearly after you fill the bag) 

6. Allow A Teabag To Float In The Air

This experiment is best done outside. First you will want to take a tea bag and put it in a glass of water , then carefully place it on top of the water in the cup. Make sure there is plenty of room between the cup and the tea bag (this will allow for air to circulate and help it to float). Watch as your teabag floats in mid-air!

7. Make A Slime Bomb

This science fair project is best done with an adult or older kid . You will want to find out what chemicals to use for the slime (you can search the internet for that) and then make it. It is best if you have a friend who knows how to make slime with you, too!

8. Build A Mini Catapult And Launch Yourself Across The Room

This science fair project can be fun , but it does take some time to get right. You will need several objects to build a mini catapult out of: a small stick, tape, string, paperclips and cans (for launching).

9. Make A Vacuum Cleaner Powered Fan

This science fair project is fun , but it can be dangerous. You will want to do this in an area where you do not have many dangerous electrical cords nearby and make sure you can easily get out of the way if it starts to fly off the ground. You will need a fan, a handheld vacuum, scissors and paperclips. First you will want to take apart your handheld vacuum and find the blade part of it. You will want to cut out about 1/2″ of the rubber around the blade. Then tape that on one side of your fan (make sure you have 2 blades facing each other).

10. Make A Solar Oven Design.

Students explore thermal energy, reflection, convection, and other physics principles as they experiment with the best way to create a solar oven . They’ll be able to serve up their experiment findings as well as their final reports!

11. Make A Rocket Powered By Dry Ice.

This is a science fair project that is best accompanied with someone who has done this before. You will want to make sure you are in an open area where you can easily get out of the way if it does not work.

First you will want to use a craft knife to cut out the bottom part of a soda bottle, making sure that you leave about 1/4″ on the bottom so it does not leak. About halfway up you will want to then cut off another part (this will be used for your air intake) and make sure your intake side is smaller than your exhaust side. Cut as close as possible so that they are seamless together.

12. Make Your Own Lava Lamp

This is a fun science fair project that involves melting wax and oil together . You will want to make sure you have something to put this in (a bottle, jar or plastic cup would work). You will need: red food coloring, water, dish detergent, oil (olive or vegetable), and that small globe from a lava lamp you might have lying around the house.

13. Take A Look At How The Greenhouse Effect Works.

The greenhouse effect is a natural phenomenon that can be observed in the Earth’s atmosphere on a daily basis. Many people are unaware of how it works and how much it affects our lives. This project encourages students to gain a better understanding of the greenhouse effect and its impact on Earth’s temperature.

14. Use Water Color To Make Your Own Kaleidoscope

You can use a permanent marker, paint or crayon. By varying the size and shape of the dots, you can create many different patterns in your result. Study how light is reflected in two and three dimensions of the pattern.

15. A Dense Rainbow Is Awe-Inspiring.

Density is the same as mass divided by volume . It is a measure of how tightly packed together molecules of matter are. This project forces students to learn about density in order to obtain a rainbow of monochromatic liquids in graduated cylinders that vary in size. The light source and liquid arrangement allows them to observe the density spectrum of each liquid.

16. Use Charcoal To Purify Water.

Water is one of the most important substances on Earth . It keeps us alive, purifies us and is also used to grow crops. Many people do not have access to clean drinking water and this project will help them by guiding them in the creation and use of charcoal for use in a filter for water purification.

17. Find Out How Energy Is Transformed.

Energy can be transformed from one form to another , but often loses some of its original properties. This project highlights the effects on a car battery if it is connected to a series of light bulbs and a conducting wire.

18. Make Your Own Tesla Coil.

Invented by Nikola Tesla in 1891, the Tesla Coil is an electrical resonant transformer circuit capable of producing extremely high voltages using an air-core transformer based on two spark gaps and two capacitors that allow alternating current through the primary coil to build up an oscillating high voltage in the secondary coil without requiring any type of power source with wires directly attached to it like you would find in conventional coils.

19. Coat Some Coins With Copper.

Copper-plating gives a metallic luster and color to many things , such as coins, jewelry, and even small kitchen utensils. In this project, students will use copper sulphate solution to convert a penny into a shiny plated coin.

20. Play With Hydraulics To See What You Can Come Up With.

Hydraulics is the study of fluids at rest or in motion and the mechanical devices that are directed by them. This project will allow students to learn about how pressure and force can be used to create movement and power.

21. Biofilms Should Be Collected And Managed.

Biofilms are naturally occurring communities of microorganisms , usually bacteria but also fungi and algae cells. Biofilms are found in almost all natural environments and on most man-made surfaces. They consist of living microbes that can persist for long periods, while producing tranquil points which may be as much as 100 times greater than their own area. This project introduces students to biofilms in order to encourage them to observe how they grow and how they are treated during the experiments.

22. Using Experiment Kits On Baking Soda And Vinegar, Make A Volcano.

An erupting volcano is an impressive sight to many people , but they are also extremely dangerous! In this experiment, students will learn about what causes volcanoes to erupt and what type of rocks are needed to build them with their own hands.

23. Crystals Are Fun To Grow And Play With.

Crystals are beautiful, fascinating and useful . Students will learn about how crystals grow by experiencing it themselves and observing the different ways they can form, with the help of a variety of experiment kits. This is a hands-on science experiment that encourages students to be creative, experience sensory impact and develop an intuitive understanding of materials as they work with them in real time.

24. Explore The Laws Of Motion Using A Spinner.

Gyroscopes are used in many aspects of our everyday lives . You know them as small spinning wheels that come with every electronic device nowadays, but their uses extend from guiding missiles and rockets in flight, to balancing boats and planes, to keeping your computer monitor from falling over on its side.

25. Make A Simple Breadboard To Use A Battery And Then Attach LEDs.

A breadboard is a board which allows you to connect multiple electronic components on one side . This project uses simple components to demonstrate the use of electricity in real time. You will need some type of battery and some LEDs, but you can buy these items at a local hardware store in addition to assembling the parts yourself.

26. Make A Simple Musical Instrument Using Simple Items.

A musical instrument is any object that is used to make music . In this project, students will use an empty plastic water bottle and some chopsticks to make a simple musical instrument; they will explore the laws of vibration by experimenting with a variety of sounds.

27. Make A Paper Airplane Which Can Fly.

A paper airplane is an aircraft designed to fly by being thrown . There are many variations of paper airplanes, but they all rely on the same basic structure and usually only require a piece of paper or thin cardboard. In this project, students will learn about aerodynamics as they build their own paper airplane.

28. Build A Storage Bin Using Recycled Materials

Storage bins are used to store clothing or other things that you do not need to use regularly but still want to keep around. This project will help students learn about the different shapes of storage bins and the ability they have to store things while being used in real time.

29. Make A Simple Compass.

A compass is a tool used to measure direction and orientation . It is used for navigation and orienteering. This project will help students explore the earth’s magnetic field using simple materials to create their own homemade compass.

30. Make A Rock Tumbler And Use It To Polish Rocks.

Polishing can be a valuable skill that provides aesthetic value and shiny, smooth surfaces for your household items. In this experiment, students will explore various sources for polishing rocks, as well as using their own creativity to create dazzling results in real-time during the experiment itself.

The field of science is vast and varied, with many different types of projects that students can engage in to learn about the world around them. Science projects can be engaging for students and teachers alike if they are designed to provoke a level of interest and excitement about what students are learning. It is also important to consider that science is not only limited to the four corners of a book or classroom; it is all around us, literally everywhere!

This means that there may be opportunities for children to learn while they are waiting in line at the bank, watching television at home, or even while they are otherwise being entertained.

15 Fascinating Science Experiments for 7th Graders

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Whether it’s for the science fair, extra credit, or just exploration, there are plenty of fantastic science experiments that seventh graders can do. Here’s a roundup of 15 fascinating science experiments for 7th graders or any child of any age really who is interested in discovering something new!! These are some of the best experiments shared across the web that are definitely worth trying.

15 Fascinating Science Projects for 7th Graders…..and beyond. 

#1 – check out charcoal’s purification abilities.

This experiment demonstrates how charcoal powder, or activated carbon, purifies water. Charcoal is used in many water filtration systems, but seeing it in action is quite impressive–and all you’ll need is activated carbon, dirty water, and a few jars! Click here for instructions.

#2 – Determine If Mint Is Actually Cooling

Sure, mint always leaves your mouth feeling cooler–but does it actually cool it down? Get the details with this fun experiment that only requires some hot water, a thermometer, and some breath mints to setup. Click here for instructions.

#3 – Experiment with what plants grow best in your home in a homemade grow box

This is such a fun experiment that your kids will love to do! Pick a various amount of seeds to plant and experiment to see which one comes up first, which one produces first etc. The possibilities are endless.  Click here for instructions.

#4 – Harness The Power of the Sun

Design the most powerful “solar oven” you can using whatever materials you have on hand–like a pizza box and some aluminum foil. Then, test the effectiveness of a few different designs and make calculations regarding how long it takes each oven, at what outdoor temperature, to melt a bar of chocolate in direct sunlight. Click here for instructions.

#5 – Measure The Effectiveness of Different Insulations

Have you ever noticed how quick ice melts when you carry a cup or glass outside? You may have even noticed that ice seems to melt more slowly when placed in a foam cup compared to a paper or plastic one. In this experiment, you’ll put these materials to the test to measure the effectiveness of each type of insulated cup–ranging from a normal glass to a cups with and without lids. Click here for instructions.

#6 – How Does Color Affect Your Memory

Are certain colors more memorable or stick out more than others? Find out with this awesome science project to see if your brain remembers things better if they are in certain colors!!  Click here for instructions.

#7 – See If You Can Prevent or Delay Rust

Rust is the result of corrosion, which occurs when moisture meets bare metal. It has long been a problem in the automotive industry and countless other fields–so what can we do to prevent or delay it? Test this out by using various products and substances (such as coatings and special paints) on clean metal and then dropping the metal into water to see what rusts the quickest. Click here for instructions.

#8 – Measure The Impact of Caffeine

Caffeine is a known stimulant and it can certainly give you a kick of energy in the morning, but does it really improve your speed or productivity? In this experiment, you’ll get to explore just how caffeine effects the body and if it really has any improvement over speed and efficiency. A typing test is a great way to measure results! Click here for instructions.

I am not an advocate of caffeine on a regular basis but discovering what caffeine does to your body could be an interesting experiment. An experiment could be done with how it affects different people differently. 

#9 – Find Out If Stretching Matters

Everyone tells you to stretch out your muscles for improved flexibility, but does stretching really make a difference? Find out by measuring flexibility before and after various stretches. Click here for instructions.

#10 – Use Cabbage to Test pH

Measuring the alkaline or acidic content of a substance doesn’t require pH strips. In this experiment, you’ll just boil down some red cabbage and use it to measure the pH of various items. The rule is simple: acids turn red and bases turn green! Click here for instructions.

I remember doing this experiment in elementary and then again in High School. Posters were updated and we ended up taking second place in High School…HA HA!! 

#11 – How Much Salt Does it Take to Float in Water???

This is an easy and fun experiment to do with eggs. You will discover how much salt it takes to allow yourself to float in water without sinking. Click Here for Instructions

#12 – See What Else Floats (or Sinks)

Most people know that oil floats in water, but the point of this experiment is to see where everything else falls. You’ll just need to take a few different substances and put them in a tall pitcher. Figure out the right order and you can make a rainbow! Click here for instructions.

#13 – Build a Generator from Scratch

Anyone can plug into a potato, but how about building a real electricity generator? With a few basic supplies, you can figure out how to do just that in this exciting science experiment. You can also easily expand upon this experiment by trying various things with the generator you build. Click here for instructions.

#14 -What do Sugary Drinks do to Our Teeth

Find out with this fun Science Experiment what sugary drinks do to your teeth! This experiment may have you think twice about how much sugary drinks you actually consume! Click here for instructions.

#15 – Testing the Effectiveness of Sunscreens

There are so many sunscreens on the market and some work better than others!! This is a fun experiment that can benefit others with your findings!! You can buy little beads that change color when placed under ultra violet light  Click here for instructions.

I hope you have found at least one in this list of science experiments for 7th graders and beyond!! 

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7th Grade Science Fair Projects: Experiments, Model Building, Research, And More

February 18, 2024 //  by  Suzanne Bucknam

From homemade helping hands to germs and sugary drinks, we have all of the most creative ideas for science projects right here! Time to use the scientific method for some awesome experiments and impress your peers. Let us help you win your middle school science fair!

1. Caffeine and Computers

Can caffeine really help us focus more and work harder or faster? Write down some questions you want to answer and get experimenting with a cup of coffee (or two) and a computer! You can also use soda or another beverage with high caffeine content.

Learn More: ThoughtCo.

2. Bridging the Gaps

Grab some pencils and small rubber bands to build a bridge inspired by Leonardo da Vinci! Follow the instructions here and see how much weight your bridge can hold at the end. You can make it more challenging by setting a time restriction or making it into a race!

Learn More: Pinterest

3. Generating Amazement

This science fair project idea is sure to win you some blue ribbons! See what materials you need here and get started constructing your generator.

Learn More: Sciencing

4. Blowing Bubbles

Does air temperature affect whether or not bubbles can form? Answer this question and others with this fun and interactive bubble-blowing science experiment using hot and cold water and see what happens!

5. Homemade Chapstick

This science activity only requires a few natural materials that your kids can mix and match to create a completely unique lip balm. With just a few easy steps, they’ll use ingredients such as beeswax, shea butter, and almond oil to whip up this useful project that they can then share with their friends and family.

Learn More: Ecoliving Mama

6. Bacteria Buddies

Collect and measure biofilm for your 7th grade science fair project. Pick a small container or surface you want to observe, submerge it in water for 2 weeks, and see what cool bacterial growth happens. Check out the link here to get started!

Learn More: The Homeschool Scientist

7. High Voice Helium

Here is some balloon science that is sure to bring laughs to the science fair. Why does helium affect our voice? Find out the answer for yourself by attempting this fun experiment!

Learn More: Physlink

8. LEGO Coding

Do your students have an interest in computers? Grab some LEGO bricks and learn the basics of coding with this fun and useful engineering science fair project .

Learn More: Little Bins For Little Hands

9. A Rainbow of Density

This colorful experiment looks almost pretty enough to drink! Measure the density of various liquids by pouring them into a see-through container and seeing how they settle in perfect layers.

10. Helping Hands

With a few materials, you can make your own working robotic hand! See what you need to begin here, and start using your extra hand to pick up some toys or have a glass of water.

Learn More: Science Buddies

11. Can Crusher

Did you know you can crush cans with air? Well, air pressure. It’s a matter of hot and cold water causing pressure build-up in the can. Follow the instructions here to see if you can snap, crackle, and pop!

Learn More: Steve Spangler Science

12. Cooking with The Sun

Are you hungry? Now you can roast your marshmallows using an old pizza box, aluminum foil, and a few other household items. See how to put your over together here and let the sun do the rest!

Learn More: ChildSci

13. Caviar or Juice Balls?

Your classmates don’t want to drink their soda or juice? Turn it into fun and delicious juice spheres using this amazing 7th-grade science project. See what you’ll need to transform your liquids here, and get mixing!

14. Acid Rain

See all the types of corrosion and how they are affected by pH levels using this fun 8th grade science project. You can choose any acidic liquid and measure the changes you see over time. Find instructions here and get experimenting!

15. It’s Dome Time!

Use newspaper, tape, and your amazing brain to create a geodesic dome that can support a surprising amount of weight. This is a simple age-appropriate idea for 5th graders but can be modified with more challenging designs for your 7th or 8th grader.

16. Climate Change in Action!

Teach your middle school students about greenhouse gases and the wonders of our atmosphere with this fun science experiment. You’ll need some glass jars, cold water, and a thermometer. Follow the instructions here to see how the sun can heat up the water and release the gas inside the jars!

Learn More: Education.com

17. The Power of Charcoal

This magical powder is used in a variety of liquid water purification systems and you can see it in action with this easy science experiment. Follow the simple instructions here to watch how activated charcoal absorbs and removes molecules from your water!

18. Bath Bomb Science

Bath bombs are great for a relaxing soak, but did you ever wonder if water temperature affects their bubbles? Grab some jars, a thermometer, and some of these fizzy bombs to test and see the results on your bath bomb science log. Find detailed instructions on how to, here!

Learn more: Steam Powered Family

19. Mummy Apples?!

Did you know that with a few basic household ingredients you can mummify your food? This experiment uses apple slices, but you can try this in class or at home with a variety of foods. See how to make these salty mummies here!

Learn More: Raising Arizona Kids

20. It’s A Germy World Out There!

Pick a room at home, or your classroom and start swabbing! Using cotton swabs, take samples from multiple surfaces and let them sit in agar and grow. Take pictures and notes on how the germs grow in a week or two. To see what you need, check out this link.

Learn More: Angelic Scalliwags Homeschool

21. Insect Behavior Experiment

There are lots of simple and observable animal behavior experiments to try. This one sees how temperature affects ant behavior. You can put a container of ants in the fridge and another in the sun and watch/record their movements.

Learn More: Ants Alive

22. Color Associations

Try this experiment out on your classmates to see how colors affect how we learn, react, and retain information. You’ll need some index cards and markers. See how to execute this experiment in a class by following the instructions in this link.

23. Pinball Fun

Pinball machines may seem complicated, but with some creativity and a few art supplies, you can make your own to show off at the science fair. See the engineering design process to build your own here.

Learn More: Science Museum Group

24.  Classifying Candy

Classification is a way to find similarities and differences within a group. With this fun experiment, your students will classify different candies to represent taxonomy and understand a little more about group formation.

Learn More: Our Journey Westward

25. Amazing Oxidation!

Grab some household items, put them in paper cups of water, and see if they rust. Watch as they react differently depending on the type of water (distilled water versus saltwater) and take notes on your findings. For more information, check out this helpful link!

Learn More: Teach Beside Me

26. Melting Ice Mixtures

See if adding sugar, salt, or other substances changes the melting speed of ice cubes with this fun and easy experiment. Follow the steps here and log your results!

27. Air-Powered Car

Can a balloon propel a car? Test this hypothesis yourself (in a mini version) using a simple homemade cardboard car and a balloon. Make a list of questions you wish to test and see if this is the future of travel!

28. Preservative Spices

This spicy experiment will have your brain and tastes buds tingling! See what spices contain the preservative ingredient “carvacrol” and how they react with dissolved chicken broth cubes by following the procedure instructions here.

29. Testing How Medications Dissolve

There are many brands of Ibuprofen out there. Pick up a few and test how well and fast they dissolve to see their effectiveness at relieving pain. Most medications need to pass into your bloodstream to work so this can give you useful real-life information. For tips and information check out this useful link.

30. Water Erosion

This experiment is a fun way to see how water and earthwork together to create incredible natural landscapes. Pour some water into sand and see how the sand moves around and forms trenches. Log your results and repeat using different methods and strategies.

31. Tee Off!

Do you like golf? Are you curious about how height affects your swing and accuracy? Try this fun experiment by getting some volunteer golfers, male and female, and 3 different tees of varying heights. See if the longer tee helps or hinders the velocity of your ball and record your results.

Learn More: Poster 4 Teachers

32. Are All Sugars the Same?

Test to see how sugar from different sources is processed by the body. Use water, honey, juice, and table sugar to test the reactions with reagent tablets. The results might give you a sugar rush!

33. Manicure Time

Grab a few different types and brands of nail polish from your local beauty store and test them out to see which last the longest. You can put a different polish on each fingernail and see how many days they take to chip or fade. Record your results.

Learn More: Supply Me

34. Germs Around Us

Test to see which surfaces have the most germs on them. Get a bacteria growing kit and pick some places to swab. You might be surprised by the germy results!

35. Portable Solar Energy

Build your own solar battery to charge your smart devices on the go. Follow the instructions here to put together your solar battery pack and see how well it works at powering your phone.

Learn More: Instructables

36. Remembering Different Fonts 

Does using one font help us remember the content better than if we were to use another one? If our teachers use Times New Roman versus Serif will we be able to remember information more easily? Grab a computer and some volunteers and try it out yourself!

Learn More: Science Fair Adventure

37. Keep it Hot!

Do you wish your hot coffee, tea, or soup never got cold? Is there a way we can keep things hot? Try out this experiment using different cups and materials to see which ones keep the heat in the longest.

38. Musical Study Session

Should classrooms have music playing in the background to help students concentrate? How do different people react to music and do different types of music affect individuals in alternative ways? Try this out with a volunteer classroom and a playlist of various genres.

39. Flowers in Time

Are there simple things we can add to our water to help our flowers bloom for longer? Does water temperature matter? What if we add sugar or salt? Test out your ideas and hypotheses with this experiment.

40. Pen or Pencil?

Test your hand movement/fatigue and note-taking ability with different writing instruments to see which works the best. Grab a few options: big pencil, mini pencil, blue pen, gel pen, marker, colored pencil. Use your classmates as test subjects and see what they think!

41. Dominant Senses

Can we feel more sensations in the dominant side of our bodies? You can try this out with 2 bowls, some hot and cold water, and a stopwatch/timer. See if you and your friends can last longer in the different temperatures with your non-dominant or dominant hands.

42. Light Up the Dark

Black lights are a super fun tool to use in any experiment with fluorescents. See what materials, liquids, chemicals, and natural resources glow under a black light and which do not. Gives reasons to explain your findings and if your predictions were proven correct or incorrect.

43. Green Thumb or Bubble Gum?

How can we make hybrid fruits and vegetables like baby kiwi and blood limes? Scientists and botanists have been experimenting with grafting for centuries, and so can you! Use some chewing gum as a way to hold the stem and cuttings together so they can grow into one new hybrid branch, and see how your new invention grows!

Learn More: 100 Amazing Science Fair Projects by Glen Vecchione

44. Vision and Eye Color

Do blue-eyed people see better than brown-eyed people? More specifically this experiment looks at peripheral vision in different eye colors. Grab some classmates with different eye colors and some objects you can place around their area of vision to see who can see the best and if there is a correlation with eye color.

45. Pop Pop POP!

See which popcorn brand pops the most kernels per bag. Grab a few bags of different popcorn and test this out with the same time and microwave to see which gives you the most pop for your buck!

46. Insulation Investigation

Get your kiddies to explore how well different materials insulate against the cold with this simple science fair project. They can use a variety of materials to insulate some hot water, then observe and record the temperature changes that occur over time with a thermometer. 

Learn More: Family Education

47. Earthquake Simulator

Shake things up at your science fair by having your learners develop an earthquake simulator. Simply have them create a shake table to demonstrate how different structures react to tremors.

Learn More: YouTube

48. Scratching the Surface

Rocks rock! Get your kiddos to create their very own hardness scales with this super geology project. They can perform scratch tests on different minerals to help them create their scale, and then compare their results to determine which minerals are the toughest in the bunch.

Learn More: All Science Fair Projects

49. Exploring Capillarity

Set your little scientists on a quest to unravel the secrets of capillarity. All they’ll need are humble paper towels, water, and food coloring to answer a pressing question: Does thickness affect speed? As they work, have them record their results to then share their Eureka moments with the rest of their class.

Learn More: 123 Homeschool 4 Me

50. Plastic Bag Biodegradation

This one’s for all the eco-champions in your class! Arm your students with shovels and biodegradable plastic bags before having them bury the bags in some soil to conduct a study on how fast different materials break down. A few weeks later, have them unearth their bags to observe the various states of decomposition.

51. Hydroponics vs. Soil Planting

Green thumbs at the ready! Have your kiddos plant seeds in both soil and a hydroponic setup. Then, over several weeks, guide them in keeping a journal where they document each plant’s growth. By the end, you and your students will have enough data to determine which method is superior for plant growth.

52. Floating on Salt

Have your learners navigate the topic of buoyancy with this fun, floating experiment. They’ll use varying salt concentrations to test if an egg floats better in salted or unsalted water. We guarantee that they’ll be shocked at the difference some salt makes!

Learn More: Science Sparks

53. Make a Compass

Challenge your kiddos to channel your inner navigators as you guide them through the mystical realms of magnetism. Equip them with a needle and a strong magnet before setting them loose to create their very own compasses. Get them to check that their creations work by comparing them against the readings of real compasses. 

54. Fruit Battery Power

This project is perfect for keen little electricians! Have your pupils connect wires to different fruits and show them how to measure which one produces the most voltage. Whether it’s a lemon, an orange, or a banana- they’ll soon discover the shocking truth about the power of fruit!

Learn More: Teaching with Jennifer Findley

55. Natural vs. Synthetic Vitamin C

Lab coats on, everyone! Your kiddos will love this activity where they get to become chemists for the day. Guide them in investigating which has a higher vitamin C content- natural sources or synthetic supplements. Using titration methods with iodine, they’ll quickly discover which source packs the greatest punch.

Learn More: StudyLib

56. Glowing Germs

Switch off the lights, we’re going dark for a germ investigation! Shock your students as you illuminate an unseen world for them. Start by applying a UV-reactive gel to commonly handled objects around the classroom. Next, break out a blacklight and let them observe just how easily those invisible “germs” can spread.

Learn More: Kids Activities Blog

57. Photosynthesis in Different Light Conditions

Let the sun shine! For this interesting project, your kiddos will grow plants under different colored pieces of cellophane and monitor their progress. Show them how to measure growth and assess the plants’ health, so that they can determine which light color is the best for photosynthesis.

Learn More: A Green Muse

58. Effect of Microwave Radiation on Seeds

Have your learners investigate the effects of a microwave with this next idea! Start by getting your pupils to microwave different seeds for varying amounts of time. After they plant them, help them to document the germination and growth rates. You and your class might be surprised to discover that radiation has its pros and cons in the realm of botany!

59. Homemade Barometer

Step aside, weather channel! Your students will be the new meteorologists in town. Start by showing them how to build their own barometers and keep daily logs. To take things a step further, encourage them to try to make connections between atmospheric pressure and weather conditions. 

Learn More: Housing a Forest

60. Impact of Exercise on Memory

Combine a workout with memory drills with this active science project to see if physical activity boosts retention. Get your kiddos moving with an exercise session and then get them to try and complete a memory test. On another occasion, try a memory test on its own and check the difference! This experiment may just produce a generation of fit geniuses!

61. Homemade Spectroscope

Invite your kiddos to step into the multicolored world of spectral analysis with this fantastic project idea! By using simple materials like a DVD, your learners can build their very own spectroscopes. Once complete, you can let them examine various light sources to identify their unique spectra of colors. 

Learn More: Buggy and Buddy

62. Homemade Compost

Dig into sustainable living by getting your kiddos to start a compost bin! As they begin adding different organic materials, they’ll be able to observe the differences in decomposition rates which will give them valuable insights into natural recycling processes.

Learn More: The Happy Housewife

63. Detecting Fake Silver

Real or fake? Let your students decide! Task your students with authenticating real silver using a variety of different methods. From checking its magnetic properties to observing chemical reactions, they’ll have fun exploring all of the various techniques to identify real silver.

Learn more: Kidal

64. Artificial vs. Natural Sweeteners

Let the sugar rush begin! Show your little scientists yeast metabolism in action with this exciting, hands-on activity. They can see the results of yeast on natural and artificial sweeteners by watching balloons fill up with the carbon dioxide produced by the reaction. This project will undoubtedly show them which sweetener really rises to the occasion.

65. Brine Shrimp and Water Quality

It’s time to dive underwater! Have your kids evaluate the effects of water quality on brine shrimp survival. They can start by setting up tap, distilled, and saltwater environments before monitoring which is most shrimp-friendly over the course of a few days or weeks.

Learn More: Home Science Tools Resource Center

66. The Sweetness of Organic vs. Non-Organic Fruits

Hold a sweetness showdown right in your very own classroom! With this fantastic project, your students will get the chance to use refractometers to gauge the sugar content in organic and non-organic fruits. Which fruit will claim sweet victory?

Learn more: YouTube

67. LDR (Light Dependent Resistor) and Light Intensity

Circuit boards at the ready! Have your learners set up a simple electrical circuit featuring a light-dependent resistor and then ask them to measure how its resistance changes with varying light conditions. What an enlightening introduction to electronics!

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Science Projects > Science Fair Projects for 7th Graders  

Science Fair Projects for 7th Graders

Science fair projects for 7th graders​​.

Science fair projects for 7th graders are a step up in complexity. Because 7th graders have a better grasp of science concepts, they’re expected to practice the scientific method in the way they approach their experiments–which includes starting with a hypothesis and then conducting processes to prove or disprove it. 

Of course, just because these science fair projects are a bit more challenging doesn’t mean that they can’t still be fun! Home Science Tools’ science kits are designed to help kids learn important science lessons through easy-to-do and enjoyable experiments. Here are some easy science fair projects for kids to explore:

Potato Battery

There are many different types of batteries, but all of them generate electricity in the same way–through a chemical reaction. This chemical reaction typically happens between two pieces of metal (electrodes) and a liquid or paste (electrolyte). Potatoes contain a lot of moisture, and this moisture works very well as an electrolyte. This means that when you add some metal electrodes to the root crop, you can create a potato battery!

Creating a potato battery will require some tools you won’t typically have in the house, such as electrodes and a multimeter. Home Science Tools’ Veggie Power Battery Kit for Science Buddies gives you everything you need to make this science fair project work! Once you have your battery, you can have fun with some science project name suggestions for the spud.

Rainbow Fire

With Home Science Tools’ Rainbow Fire Kit for Science Buddies, your child can find out how different chemical compounds react with fire and how these reactions emit different colors. Besides the lesson on chemical reactions, this kit also touches on some astronomy. Astronomers actually determine the atomic composition of different stars by measuring the spectrum of light they emit!

Bacteria Colonies

Bacteria grow all around us, and it’s fun to find out just how much of it exists in everyday items. With Home Science Tools’ Bacteria Growing Kit for Science Buddies, your student can culture their own microbe colony from bacteria swabbed from everyday household items. 

They can explore bacteria on their hands, from their phones, or on the kitchen counter, and learn how to isolate and grow bacteria colonies. Some science fair project ideas include comparing which household surface contains the most germs or checking if a pet’s mouth is dirtier than its owner’s!

Crystal Radio

A crystal radio is the simplest type of radio receiver as it doesn’t need any external power; instead, it only uses sound waves to produce sound. Its name comes from its most important component, a crystal detector (called a ‘diode’), which is made from crystalline minerals (such as galena). 

Home Science Tools’ Build Your Own Crystal Radio Kit for Science Buddies allows you to make this popular form of receiver with all the necessary tools. It’s a great way to allow your 7th grader to present a science fair project on radio waves while learning the basic radio circuit elements required to receive radio signals.

Find Science Fair Project Kits on Home Science Tools

Home Science Tools is dedicated to making science fun and accessible with home science kits that are easy to do! You can explore different options, from easy experiments you can do at home to explorative activities that make for great science fair projects for 7th graders. Check out our catalog in time for your child’s next science fair presentation!

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Cool 7th Grade Science Experiments

Basic Radioactivity Experiments

Science is a main subject in the middle school learning curriculum, and sometimes a science-fair project will count as a percentage of the student's grade. Helping your child to choose a cool, fun science project for her science fair may help to peak her interest, hence improve her grade.

Heat and Evaporation Experiments

One interesting science project for kids grades 4 through 7 is an evaporation and heat experiment. You'll need a few boxes, water dishes and light bulbs of various wattage in small lamps. Children can establish a hypothesis regarding which wattage of bulbs will evaporate the water faster and then prove it by performing tests on their samples. Kids can measure equal amounts of water into each dish, place the water dishes in separate boxes, and place a different wattage of light bulb over each dish. After a specified amount of time, the children can remove the lights and measure the remaining water to see which bulb evaporated the water most rapidly.

Potato Lamp

By attaching a low voltage bulb to a potato, middle school student can safely learn to create an electric charge. This science project is recommended for children from grades 3 through 8. Student will take a penny and wrap a piece of electrical wire around it. Then they should wrap the other end of the wire around a galvanized nail. Once this has been done, the kids can cut a potato in half and insert the penny into one half of the potato and the nail into the other. Students will then attach two alligator clips to the wire and the opposite ends of both alligator clips will be attached to the end of a small light emitting diode (LED). If the project is successful, the LED will light up. Fresh potatoes have been found to be most effective in this experiment.

Home-Made Thermometer

A cool science project that children may find interesting is making a thermometer. By taking a water bottle and filling it with 25 percent water, 50 percent rubbing alcohol, leaving 25 percent empty, and then placing a straw inside, children can create a device to measure heat levels in the water. Be sure the children use tape or modeling clay at the top of the bottle to secure the straw in an upright position. When the bottle is placed near a heating device you should begin to see the liquid rise up through the straw as the water becomes warmer.

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• The Free Science Fair Projects Network: Science Fair Projects Database
• Science Project Lab: 7th Grade Science Fair Project Ideas
• PhysLink: How can a potato be used to light a lightbulb

About the Author

Michelle Renee is a professional trainer and quality assurance consultant in the career, education and customer service industries, with two decades of experience in food/beverage and event coordinating management. Renee has been published by Lumino and Career Flight as well as various food, education and business publications.

Photo Credits

Sarah Vantassel/Demand Media

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30+ Science Fair Projects That Will Wow The Crowd

February 20, 2022 by Ana Dziengel Leave a Comment

Are your children signing up for the science fair this year? Have you begun the arduous task of looking for  science fair projects  that might pique your child’s interest? Or do you have a child who already has ten ideas they have been dying to try?

The science fair is a great school tradition and a memorable experience for many children (I still remember the life size plaster penguin I made in 5th grade), and if your school doesn’t conduct one, consider starting it!

This year if you are on the lookout for science fair projects I challenge you to think beyond the vinegar volcano (we have “Volcano Alley” at our school because there are so many volcano projects every year). I know, vinegar volcanoes are like a rite of childhood passage, but there are so many other amazing science ideas out there! I have compiled a list of 30+ science fair projects for kids based on their grade level below. Before we get started I wanted to share some tips for getting the most out of the science fair.

This post contains affiliate links.

Science Fair Tips

• Don’t do the project for your child! This is my number one tip. Many parents have a tendency to jump in and make children’s work “more presentable” or to assist their child so much in the project that it’s hard to know who actually did it. Listen I get it, science is fun and you want your child to have a wonderful presentation…but that’s not really what the science fair is about. It’s about your child learning how to do scientific research and present their findings in their own way. Think of yourself as a helpful guide NOT an assistant, and definitely not the boss.
• Choose something age  appropriate  When your child is choosing the science fair idea they want to try, make sure it’s age appropriate. Sure we’d all love to make a working robot but there’s nothing more frustrating than trying a project that may be too advanced for the skills of your child. And that’s when a lot of parents resort to doing the project instead. Not a good solution. So make sure your child is capable of completing the steps them self.
• Make a list of three ideas Have your child select three science fair project ideas and then go over the choices with them. Make sure they understand the steps involved in each project and wether or not they feel comfortable in executing those steps on their own with your guidance.
• Follow your child’s interests Encourage your children to explore some ideas based on interests they already have. Here’s a list of science books with projects based on things your child already loves!
• STEAM it up! STEAM projects rock the science fair!!! A great way to get kids to become more familiar with STEAM concepts it to pick science projects that crossover into art, math, engineering and more!  Two STEAM books to consider are  STEAM Kids Play and Learn (my book!) and   STEAM Kids ebook.  Both books will get you started with some great ideas!
• Read our Science Fair Mini Guide I created this mini guide to walk kids  through all the steps for completing their science fair project. You can check out the full guide here: 

Speak like a scientist! Science Vocabulary to use in your presentation

We’re almost ready to get to the projects! Before we begin, let’s review some science terms. In fact, using these terms in your science fair presentation will be sure to impress your friends and adults!

• When you watch, see, or notice something you are making an observation
• When you ask who, what, when, where, why, or how, you are forming a question  
• When you read a book or an article about your observation, you are doing research
• When you make a guess based on your observation, question, and research, you are forming a hypothesis
• When you test your hypothesis, you are conducting an experiment
• When you change one factor in your experiment at a time while keeping everything else the same, you are changing a variable
• When you take notes in your journal and write down what you see happening in your experiment, you are logging data  
• When you examine, or look at, your data, you are analyzing it
• When you are able answer your question, you are coming to a conclusion

30+ Science Fair Projects for Kids 

Now let’s get on with the science fair projects! I have organized the projects by age/grade level. Click the titles to be taken to the project instructions, unless the instructions follow below.

If you’d rather have the science fair projects list organized by subject you can download our hyperlinked PDF by subscribing to our email list here .

Kindergarten-1st Grade Science Fair Projects

1.  lemon volcano.

Skip the vinegar volcano and try lemon juice! Kids will learn about the chemical reaction between citric acid and baking soda.

2. DIY Bouncy Balls

Learn about polymers while making a DIY toy!  This variation on slime uses a few simple ingredients. <span data-mce-type=”bookmark” style=”display: inline-block; width: 0px; overflow: hidden; line-height: 0;” class=”mce_SELRES_start”></span>

3. Shiny Pennies

A classic experiment that kids love is Shiny Pennies . Collect dirty tarnished pennies and have kids soak them for a minimum of 5 minutes in different acidic liquids. We used vinegar, salsa, lime juice, and lemon juice.  After soaking, remove them from the solution and rinse in soapy water then compare which ones are shiniest. Take notes on which acid worked best to shine the pennies. Variation: Don’t rinse all the pennies after removing them from the different liquids. Can you see a difference in the rinsed vs. non-rinsed pennies? Leave them overnight and see if any of the copper oxidizes (turns green) on the non-rinsed pennies.

pictured above: Regrowing vegetable scraps, DIY Stethoscope, Simple Circuit

4.  Regrow Vegetable Scraps

Did you know you can start an entire garden from vegetable scraps? It works indoors too!

5.  DIY Stethoscope

Make your own stethoscope from a few hardware store parts.

6.  Simple Circuit

For all tech centered kids: Learn how to make a very simple circuit from easy to find items.

pictured above: Chromatography Butterflies, Rainbow Rubber Eggs, Exploring Density with Salt

7. Chromatography 3 Ways

Chromatography is the process of separating mixtures, in this case we will be separating ink into different colors.

• How to do the Classic Chromatography Project The simplest kids chromatography project using paper towels
• Chromatography Art Turn chromatography strips into a woven paper art project!
• Chromatography Butterflies Learn how to separate colors and create a sweet science based craft!

8. Exploring Density with Salt

Why don’t oil and water mix? Find out with this density experiment inspired by Lava Lamps!

9. Rainbow Rubber Eggs

Rubber eggs are another classic science project that kids love. And it’s so easy! I mean does dropping an egg in vinegar and coming back in a few days sound do-able?

2nd-4th grade Science Fair Projects

10. magic rollback can.

You just can’t get rid of this physics project! This project explores the difference between potential and kinetic energy. <span data-mce-type=”bookmark” style=”display: inline-block; width: 0px; overflow: hidden; line-height: 0;” class=”mce_SELRES_start”></span>

pictured above: Bleeding Blossoms, Teleidoscopes, Density Tower

11. Absorption 2 Ways

• Bleeding Blossoms Explore capillary action and absorption in this science meets art project.
• Magical Water Blossoms Make beautiful blossoming paper flowers with the help of absorption. This project has a simple wow moment that everyone enjoys watching.

12.  Teleidoscopes

A teleidoscope is a kaliedoscpe without an end. This means you can use it to view anything and everything. Look through one of these and you will be amazed!

13. Density Towers 2 Ways:

Yes, you can layer liquids on top of each other without them mixing! This is a classic project and kids can customize the liquids they choose to layer.

• Simple Layered Liquids Learn how to make a simple density tower out of kitchen ingredients and then turn it into a lava lamp!
• Glowing Density Tower This density tower has a bonus science surprise: it glows under UV light!

14.  Magnet Magic

Make a simple hanging magnet structure and explore the magic of magnetism.

pictured above: Chromatography Art, Dry Erase Figure, Overnight Crystals

15. Make a Lemon Battery and a Lime Light

Did you know that a chemical reaction can generate electricity?

16.  Electric Playdough

AKA Squishy Circuits, this project will demonstrate that salt and water conduct electricity!

17. Simple Sound Science

Explore the science of sound with these 4 experiments, then use your knowledge to make your own DIY instrument!

pictured above: Magnetic Sensory Bottle, Magical Plastic Bag, Cartesian Divers

18.  Magnetic Field Sensory Bottle

This will surely be a hit at the Science Fair! Watch metal particles dance and move under the influence of powerful magnets!

19.  Magical Plastic Bag Experiment

It’s not magic, it’s polymers! This easy science fair project uses a minimum of materials but demonstrates how everyday polymers work.

20.  Cartesian Divers

A classic science experiment exploring buoyancy. Make “diver” swim up and down in a bottle using science.

21. Water Drop Microscope

Did you know you can make simple microscope from a plastic bottle and water? This project teaches kids to turn trash into a science tool!

22. Spinning Tops

Learn about centrifugal force and friction with one of these three spinning tops ideas!

• Spin Art Tops
• Spin-finite Tops
• Perler Bead Tops

23. Kinetic Sculpture

Make you own moving sculpture while learning about cams and gears!

<span data-mce-type=”bookmark” style=”display: inline-block; width: 0px; overflow: hidden; line-height: 0;” class=”mce_SELRES_start”></span>

Science Fair Projects for 5th Grade and up

pictured above: Crystal landscapes, Tiny Dancers, Coffee Can Camera Obscura

24. Crystals 3 Ways:

• Overnight Crystals Grow Epsom salt crystals overnight in your refrigerator.
• Crystal Wind Catchers Borax crystals are SUPER easy to grow! Turn them into a lovely dangling wind catcher.
• Crystal Landscapes A more advanced crystal growing experiment using bluing and salt but WOW, these are gorgeous!

25.  Tiny Dancers

These are actually a very simple motor! Kids will learn about electromagnetism by building this motor that can “dance.”

26.  Coffee Can Camera Obscura

Make a simple camera obscura out of an old coffee can.

pictured above: Heat Sensitive Slime, Levitating Pen

27. Heat Sensitive Slime

Click your slime chemistry up a notch by adding in thermochromic paint!

28.  Levitating Pen

Make a pen appear to levitate using a magnet!

29.  Newton’s Cradle

Featured on Dude Perfect! I made one of these for the science fair back in the 1980’s…This science “toy” is mesmerizing for kids and adults alike!

pictured above: Electromagnetic Train, Fake Lung, Articulated Hand

30.  Electromagnetic Train

Incredible display of electricity and magnetism!

31.  Fake Lung

For kids interested in life science and biology, make a model of how our lungs work for the science fair.

32.  Articulated Hand

Another one for biology oriented kids, explore how our joints move by creating an articulated hand.

33. Salty Circuits

In this simple circuit project, kids will create an electrical circuit using salt to conduct electricity and power a light emitting diode (LED).

Are you ready for the science fair?

Whether your child has never participated in the science fair or is an old pro, I hope the science fair projects here will inspire them to have fun, explore science, and get creative the same time.

And if you still need MORE ideas I also have a giant list of chemistry projects for kids that would make amazing science fair starter projects!

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37 Cool Science Experiments for Kids to Do at Home

General Education

Are you looking for cool science experiments for kids at home or for class? We've got you covered! We've compiled a list of 37 of the best science experiments for kids that cover areas of science ranging from outer space to dinosaurs to chemical reactions. By doing these easy science experiments, kids will make their own blubber and see how polar bears stay warm, make a rain cloud in a jar to observe how weather changes, create a potato battery that'll really power a lightbulb, and more.

Below are 37 of the best science projects for kids to try. For each one we include a description of the experiment, which area(s) of science it teaches kids about, how difficult it is (easy/medium/hard), how messy it is (low/medium/high), and the materials you need to do the project. Note that experiments labelled "hard" are definitely still doable; they just require more materials or time than most of these other science experiments for kids.

#1: Insect Hotels

• Teaches Kids About: Zoology
• Difficulty Level: Medium
• Messiness Level: Medium

Insect hotels can be as simple (just a few sticks wrapped in a bundle) or as elaborate as you'd like, and they're a great way for kids to get creative making the hotel and then get rewarded by seeing who has moved into the home they built. After creating a hotel with hiding places for bugs, place it outside (near a garden is often a good spot), wait a few days, then check it to see who has occupied the "rooms." You can also use a bug ID book or app to try and identify the visitors.

• Materials Needed
• Shadow box or other box with multiple compartments
• Hot glue gun with glue
• Sticks, bark, small rocks, dried leaves, bits of yarn/wool, etc.

#2: DIY Lava Lamp

• Teaches Kids About: Chemical reactions
• Difficulty Level: Easy

In this quick and fun science experiment, kids will mix water, oil, food coloring, and antacid tablets to create their own (temporary) lava lamp . Oil and water don't mix easily, and the antacid tablets will cause the oil to form little globules that are dyed by the food coloring. Just add the ingredients together and you'll end up with a homemade lava lamp!

• Vegetable oil
• Food coloring
• Antacid tablets

#3: Magnetic Slime

• Teaches Kids About: Magnets
• Messiness Level: High (The slime is black and will slightly dye your fingers when you play with it, but it washes off easily.)

A step up from silly putty and Play-Doh, magnetic slime is fun to play with but also teaches kids about magnets and how they attract and repel each other. Some of the ingredients you aren't likely to have around the house, but they can all be purchased online. After mixing the ingredients together, you can use the neodymium magnet (regular magnets won't be strong enough) to make the magnetic slime move without touching it!

• Liquid starch
• Adhesive glue
• Iron oxide powder
• Neodymium (rare earth) magnet

#4: Baking Soda Volcanoes

• Teaches Kids About: Chemical reactions, earth science
• Difficulty Level: Easy-medium
• Messiness Level: High

Baking soda volcanoes are one of the classic science projects for kids, and they're also one of the most popular. It's hard to top the excitement of a volcano erupting inside your home. This experiment can also be as simple or in-depth as you like. For the eruption, all you need is baking soda and vinegar (dishwashing detergent adds some extra power to the eruption), but you can make the "volcano" as elaborate and lifelike as you wish.

• Baking soda
• Dishwashing detergent
• Large mason jar or soda bottle
• Playdough or aluminum foil to make the "volcano"
• Additional items to place around the volcano (optional)
• Food coloring (optional)

#5: Tornado in a Jar

• Teaches Kids About: Weather
• Messiness Level: Low

This is one of the quick and easy and science experiments for kids to teach them about weather. It only takes about five minutes and a few materials to set up, but once you have it ready you and your kids can create your own miniature tornado whose vortex you can see and the strength of which you can change depending on how quickly you swirl the jar.

• Glitter (optional)

#6: Colored Celery Experiment

• Teaches Kids About: Plants

This celery science experiment is another classic science experiment that parents and teachers like because it's easy to do and gives kids a great visual understanding of how transpiration works and how plants get water and nutrients. Just place celery stalks in cups of colored water, wait at least a day, and you'll see the celery leaves take on the color of the water. This happens because celery stalks (like other plants) contain small capillaries that they use to transport water and nutrients throughout the plant.

• Celery stalks (can also use white flowers or pale-colored cabbage)

#7: Rain Cloud in a Jar

This experiment teaches kids about weather and lets them learn how clouds form by making their own rain cloud . This is definitely a science project that requires adult supervision since it uses boiling water as one of the ingredients, but once you pour the water into a glass jar, the experiment is fast and easy, and you'll be rewarded with a little cloud forming in the jar due to condensation.

• Glass jar with a lid
• Boiling water
• Aerosol hairspray

#8: Edible Rock Candy

• Teaches Kids About: Crystal formation

It takes about a week for the crystals of this rock candy experiment to form, but once they have you'll be able to eat the results! After creating a sugar solution, you'll fill jars with it and dangle strings in them that'll slowly become covered with the crystals. This experiment involves heating and pouring boiling water, so adult supervision is necessary, once that step is complete, even very young kids will be excited to watch crystals slowly form.

• Large saucepan
• Clothespins
• String or small skewers
• Candy flavoring (optional)

#9: Water Xylophone

• Teaches Kids About: Sound waves

With just some basic materials you can create your own musical instrument to teach kids about sound waves. In this water xylophone experiment , you'll fill glass jars with varying levels of water. Once they're all lined up, kids can hit the sides with wooden sticks and see how the itch differs depending on how much water is in the jar (more water=lower pitch, less water=higher pitch). This is because sound waves travel differently depending on how full the jars are with water.

• Wooden sticks/skewers

#10: Blood Model in a Jar

• Teaches Kids About: Human biology

This blood model experiment is a great way to get kids to visual what their blood looks like and how complicated it really is. Each ingredient represents a different component of blood (plasma, platelets, red blood cells, etc.), so you just add a certain amount of each to the jar, swirl it around a bit, and you have a model of what your blood looks like.

• Empty jar or bottle
• Red cinnamon candies
• Marshmallows or dry white lima beans
• White sprinkles

#11: Potato Battery

• Teaches Kids About: Electricity
• Difficulty Level: Hard

Did you know that a simple potato can produce enough energy to keep a light bulb lit for over a month? You can create a simple potato battery to show kids. There are kits that provide all the necessary materials and how to set it up, but if you don't purchase one of these it can be a bit trickier to gather everything you need and assemble it correctly. Once it's set though, you'll have your own farm grown battery!

• Fresh potato
• Galvanized nail
• Copper coin

#12: Homemade Pulley

• Teaches Kids About: Simple machines

This science activity requires some materials you may not already have, but once you've gotten them, the homemade pulley takes only a few minutes to set up, and you can leave the pulley up for your kids to play with all year round. This pulley is best set up outside, but can also be done indoors.

• Clothesline
• 2 clothesline pulleys

#13: Light Refraction

• Teaches Kids About: Light

This light refraction experiment takes only a few minutes to set up and uses basic materials, but it's a great way to show kids how light travels. You'll draw two arrows on a sticky note, stick it to the wall, then fill a clear water bottle with water. As you move the water bottle in front of the arrows, the arrows will appear to change the direction they're pointing. This is because of the refraction that occurs when light passes through materials like water and plastic.

• Sticky note
• Transparent water bottle

#14: Nature Journaling

• Teaches Kids About: Ecology, scientific observation

A nature journal is a great way to encourage kids to be creative and really pay attention to what's going on around them. All you need is a blank journal (you can buy one or make your own) along with something to write with. Then just go outside and encourage your children to write or draw what they notice. This could include descriptions of animals they see, tracings of leaves, a drawing of a beautiful flower, etc. Encourage your kids to ask questions about what they observe (Why do birds need to build nests? Why is this flower so brightly colored?) and explain to them that scientists collect research by doing exactly what they're doing now.

• Blank journal or notebook
• Pens/pencils/crayons/markers
• Tape or glue for adding items to the journal

#15: DIY Solar Oven

• Teaches Kids About: Solar energy

This homemade solar oven definitely requires some adult help to set up, but after it's ready you'll have your own mini oven that uses energy from the sun to make s'mores or melt cheese on pizza. While the food is cooking, you can explain to kids how the oven uses the sun's rays to heat the food.

• Aluminum foil
• Knife or box cutter
• Permanent marker
• Plastic cling wrap
• Black construction paper

#16: Animal Blubber Simulation

• Teaches Kids About: Ecology, zoology

If your kids are curious about how animals like polar bears and seals stay warm in polar climates, you can go beyond just explaining it to them; you can actually have them make some of their own blubber and test it out. After you've filled up a large bowl with ice water and let it sit for a few minutes to get really cold, have your kids dip a bare hand in and see how many seconds they can last before their hand gets too cold. Next, coat one of their fingers in shortening and repeat the experiment. Your child will notice that, with the shortening acting like a protective layer of blubber, they don't feel the cold water nearly as much.

• Bowl of ice water

#17: Static Electricity Butterfly

This experiment is a great way for young kids to learn about static electricity, and it's more fun and visual than just having them rub balloons against their heads. First you'll create a butterfly, using thick paper (such as cardstock) for the body and tissue paper for the wings. Then, blow up the balloon, have the kids rub it against their head for a few seconds, then move the balloon to just above the butterfly's wings. The wings will move towards the balloon due to static electricity, and it'll look like the butterfly is flying.

• Tissue paper
• Thick paper
• Glue stick/glue

#18: Edible Double Helix

• Teaches Kids About: Genetics

If your kids are learning about genetics, you can do this edible double helix craft to show them how DNA is formed, what its different parts are, and what it looks like. The licorice will form the sides or backbone of the DNA and each color of marshmallow will represent one of the four chemical bases. Kids will be able to see that only certain chemical bases pair with each other.

• 2 pieces of licorice
• 12 toothpicks
• Small marshmallows in 4 colors (9 of each color)
• 5 paperclips

#19: Leak-Proof Bag

• Teaches Kids About: Molecules, plastics

This is an easy experiment that'll appeal to kids of a variety of ages. Just take a zip-lock bag, fill it about ⅔ of the way with water, and close the top. Next, poke a few sharp objects (like bamboo skewers or sharp pencils) through one end and out the other. At this point you may want to dangle the bag above your child's head, but no need to worry about spills because the bag won't leak? Why not? It's because the plastic used to make zip-lock bags is made of polymers, or long chains of molecules that'll quickly join back together when they're forced apart.

• Zip-lock bags
• Objects with sharp ends (pencils, bamboo skewers, etc.)

#20: How Do Leaves Breathe?

• Teaches Kids About: Plant science

It takes a few hours to see the results of this leaf experiment , but it couldn't be easier to set up, and kids will love to see a leaf actually "breathing." Just get a large-ish leaf, place it in a bowl (glass works best so you can see everything) filled with water, place a small rock on the leaf to weigh it down, and leave it somewhere sunny. Come back in a few hours and you'll see little bubbles in the water created when the leaf releases the oxygen it created during photosynthesis.

• Large bowl (preferably glass)
• Magnifying glass (optional)

#21: Popsicle Stick Catapults

Kids will love shooting pom poms out of these homemade popsicle stick catapults . After assembling the catapults out of popsicle sticks, rubber bands, and plastic spoons, they're ready to launch pom poms or other lightweight objects. To teach kids about simple machines, you can ask them about how they think the catapults work, what they should do to make the pom poms go a farther/shorter distance, and how the catapult could be made more powerful.

• Popsicle sticks
• Rubber bands
• Plastic spoons
• Paint (optional)

#22: Elephant Toothpaste

You won't want to do this experiment near anything that's difficult to clean (outside may be best), but kids will love seeing this " elephant toothpaste " crazily overflowing the bottle and oozing everywhere. Pour the hydrogen peroxide, food coloring, and dishwashing soap into the bottle, and in the cup mix the yeast packet with some warm water for about 30 seconds. Then, add the yeast mixture to the bottle, stand back, and watch the solution become a massive foamy mixture that pours out of the bottle! The "toothpaste" is formed when the yeast removed the oxygen bubbles from the hydrogen peroxide which created foam. This is an exothermic reaction, and it creates heat as well as foam (you can have kids notice that the bottle became warm as the reaction occurred).

• Clean 16-oz soda bottle
• 6% solution of hydrogen peroxide
• 1 packet of dry yeast
• Dishwashing soap

#23: How Do Penguins Stay Dry?

Penguins, and many other birds, have special oil-producing glands that coat their feathers with a protective layer that causes water to slide right off them, keeping them warm and dry. You can demonstrate this to kids with this penguin craft by having them color a picture of a penguin with crayons, then spraying the picture with water. The wax from the crayons will have created a protective layer like the oil actual birds coat themselves with, and the paper won't absorb the water.

• Penguin image (included in link)
• Spray bottle
• Blue food coloring (optional)

#24: Rock Weathering Experiment

• Teaches Kids About: Geology

This mechanical weathering experiment teaches kids why and how rocks break down or erode. Take two pieces of clay, form them into balls, and wrap them in plastic wrap. Then, leave one out while placing the other in the freezer overnight. The next day, unwrap and compare them. You can repeat freezing the one piece of clay every night for several days to see how much more cracked and weathered it gets than the piece of clay that wasn't frozen. It may even begin to crumble. This weathering also happens to rocks when they are subjected to extreme temperatures, and it's one of the causes of erosion.

• Plastic wrap

#25: Saltwater Density

• Teaches Kids About: Water density

For this saltwater density experiment , you'll fill four clear glasses with water, then add salt to one glass, sugar to one glass, and baking soda to one glass, leaving one glass with just water. Then, float small plastic pieces or grapes in each of the glasses and observe whether they float or not. Saltwater is denser than freshwater, which means some objects may float in saltwater that would sink in freshwater. You can use this experiment to teach kids about the ocean and other bodies of saltwater, such as the Dead Sea, which is so salty people can easily float on top of it.

• Four clear glasses
• Lightweight plastic objects or small grapes

#26: Starburst Rock Cycle

With just a package of Starbursts and a few other materials, you can create models of each of the three rock types: igneous, sedimentary, and metamorphic. Sedimentary "rocks" will be created by pressing thin layers of Starbursts together, metamorphic by heating and pressing Starbursts, and igneous by applying high levels of heat to the Starbursts. Kids will learn how different types of rocks are forms and how the three rock types look different from each other.

• Toaster oven

#27: Inertia Wagon Experiment

• Teaches Kids About: Inertia

This simple experiment teaches kids about inertia (as well as the importance of seatbelts!). Take a small wagon, fill it with a tall stack of books, then have one of your children pull it around then stop abruptly. They won't be able to suddenly stop the wagon without the stack of books falling. You can have the kids predict which direction they think the books will fall and explain that this happens because of inertia, or Newton's first law.

• Stack of books

#28: Dinosaur Tracks

• Teaches Kids About: Paleontology

How are some dinosaur tracks still visible millions of years later? By mixing together several ingredients, you'll get a claylike mixture you can press your hands/feet or dinosaur models into to make dinosaur track imprints . The mixture will harden and the imprints will remain, showing kids how dinosaur (and early human) tracks can stay in rock for such a long period of time.

• Used coffee grounds
• Wooden spoon
• Rolling pin

#29: Sidewalk Constellations

• Teaches Kids About: Astronomy

If you do this sidewalk constellation craft , you'll be able to see the Big Dipper and Orion's Belt in the daylight. On the sidewalk, have kids draw the lines of constellations (using constellation diagrams for guidance) and place stones where the stars are. You can then look at astronomy charts to see where the constellations they drew will be in the sky.

• Sidewalk chalk
• Small stones
• Diagrams of constellations

#30: Lung Model

By building a lung model , you can teach kids about respiration and how their lungs work. After cutting off the bottom of a plastic bottle, you'll stretch a balloon around the opened end and insert another balloon through the mouth of the bottle. You'll then push a straw through the neck of the bottle and secure it with a rubber band and play dough. By blowing into the straw, the balloons will inflate then deflate, similar to how our lungs work.

• Plastic bottle
• Rubber band

#31: Homemade Dinosaur Bones

By mixing just flour, salt, and water, you'll create a basic salt dough that'll harden when baked. You can use this dough to make homemade dinosaur bones and teach kids about paleontology. You can use books or diagrams to learn how different dinosaur bones were shaped, and you can even bury the bones in a sandpit or something similar and then excavate them the way real paleontologists do.

• Images of dinosaur bones

#32: Clay and Toothpick Molecules

There are many variations on homemade molecule science crafts . This one uses clay and toothpicks, although gumdrops or even small pieces of fruit like grapes can be used in place of clay. Roll the clay into balls and use molecule diagrams to attach the clay to toothpicks in the shape of the molecules. Kids can make numerous types of molecules and learn how atoms bond together to form molecules.

• Clay or gumdrops (in four colors)
• Diagrams of molecules

#33: Articulated Hand Model

By creating an articulated hand model , you can teach kids about bones, joints, and how our hands are able to move in many ways and accomplish so many different tasks. After creating a hand out of thin foam, kids will cut straws to represent the different bones in the hand and glue them to the fingers of the hand models. You'll then thread yarn (which represents tendons) through the straws, stabilize the model with a chopstick or other small stick, and end up with a hand model that moves and bends the way actual human hands do.

• Straws (paper work best)
• Twine or yarn

#34: Solar Energy Experiment

• Teaches Kids About: Solar energy, light rays

This solar energy science experiment will teach kids about solar energy and how different colors absorb different amounts of energy. In a sunny spot outside, place six colored pieces of paper next to each other, and place an ice cube in the middle of each paper. Then, observe how quickly each of the ice cubes melt. The ice cube on the black piece of paper will melt fastest since black absorbs the most light (all the light ray colors), while the ice cube on the white paper will melt slowest since white absorbs the least light (it instead reflects light). You can then explain why certain colors look the way they do. (Colors besides black and white absorb all light except for the one ray color they reflect; this is the color they appear to us.)

• 6 squares of differently colored paper/cardstock (must include black paper and white paper)

#35: How to Make Lightning

• Teaches Kids About: Electricity, weather

You don't need a storm to see lightning; you can actually create your own lightning at home . For younger kids this experiment requires adult help and supervision. You'll stick a thumbtack through the bottom of an aluminum tray, then stick the pencil eraser to the pushpin. You'll then rub the piece of wool over the aluminum tray, and then set the tray on the Styrofoam, where it'll create a small spark/tiny bolt of lightning!

• Pencil with eraser
• Aluminum tray or pie tin
• Styrofoam tray

#36: Tie-Dyed Milk

• Teaches Kids About: Surface tension

For this magic milk experiment , partly fill a shallow dish with milk, then add a one drop of each food coloring color to different parts of the milk. The food coloring will mostly stay where you placed it. Next, carefully add one drop of dish soap to the middle of the milk. It'll cause the food coloring to stream through the milk and away from the dish soap. This is because the dish soap breaks up the surface tension of the milk by dissolving the milk's fat molecules.

• Shallow dish
• Milk (high-fat works best)

#37: How Do Stalactites Form?

Have you ever gone into a cave and seen huge stalactites hanging from the top of the cave? Stalactites are formed by dripping water. The water is filled with particles which slowly accumulate and harden over the years, forming stalactites. You can recreate that process with this stalactite experiment . By mixing a baking soda solution, dipping a piece of wool yarn in the jar and running it to another jar, you'll be able to observe baking soda particles forming and hardening along the yarn, similar to how stalactites grow.

• Safety pins
• 2 glass jars

Summary: Cool Science Experiments for Kids

Any one of these simple science experiments for kids can get children learning and excited about science. You can choose a science experiment based on your child's specific interest or what they're currently learning about, or you can do an experiment on an entirely new topic to expand their learning and teach them about a new area of science. From easy science experiments for kids to the more challenging ones, these will all help kids have fun and learn more about science.

What's Next?

Are you also interested in pipe cleaner crafts for kids? We have a guide to some of the best pipe cleaner crafts to try!

Looking for multiple different slime recipes? We tell you how to make slimes without borax and without glue as well as how to craft the ultimate super slime .

Want to learn more about clouds? Learn how to identify every cloud in the sky with our guide to the 10 types of clouds .

Want to know the fastest and easiest ways to convert between Fahrenheit and Celsius? We've got you covered! Check out our guide to the best ways to convert Celsius to Fahrenheit (or vice versa) .

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Science Struck

Stop Worrying, 7th Grades! Here are 35 Rad Science Fair Topics

Making projects for science fair topics for 7th grade is a unique way in teaching children scientific concepts that are difficult to understand. Which is why they must be fun, creative, and easy to try.

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Academics beyond textbooks and classroom walls make a better impact. Science fairs projects are one such kind of learning medium, where the toughest topics can be explained with interesting models and graphical representations. With a little help, any subject can be turned into an eye pleasing science fair project. To make science fair topics for 7th grade worth the effort, let the students pick the topics they like.

List of Science Fairs Topics for 7th Grade

• How does a magnet affect radish plant growth?
• Does temperature affect the performance of a fuel cell?
• Which building design will best withstand an earthquake?
• What techniques do air traffic controllers use to control air traffic? How efficient are these techniques?
• How does temperature affect the survival rate of aquatic plants?
• Can animals see in the dark better than humans? Explain how.
• Does shoe design really affect an athlete’s jumping height?
• What kind of fertilizers work better? Natural or synthetic?
• What light brightness makes plants grow the best?
• How much weight can the surface tension of water hold?
• Can people tell artificial smells from real ones?
• How does music affect animal and plant behavior?
• What is the best way to prevent an ice cube from melting?
• How is out heart rate affected by the food we eat?
• What are the terrible effects of acid rain?
• Can background noise levels affect how well we concentrate?
• Do antioxidants really improve a human’s life span?
• How does temperature affect the growth of yeast or mold on bread?
• Does the species of wood affect the rate at which it burns?
• How does talking on a cell phone or listening to music affect reaction time?
• Do we remember a sequence of letters and numbers better if they hear or see the sequence first?
• What is the importance of breakfast in our lives? How does it affect our metabolism rate?
• How does music influence learning and memory?
• Do daily memory-oriented activities slow memory loss at occurs with aging?
• How does caffeine and nicotine affect bacterial growth?
• What antibacterial properties do extracts from basil and mint plants have?
• What effects do garlic and vitamin C have on high blood pressure in people?
• Does the Atkins high-protein diet really work?
• How does exercise affect heart rate recovery?
• How does light affect the vitamin C content of juice?
• How effective are herbal oils and DEET as mosquito repellents?
• Can vocal wave form patterns be used to identify individuals?
• Can computer systems for recognizing human motion be used to counter terrorism?
• How does sunspot activity affect radio reception?
• How does the air temperature affect carbon monoxide emissions when a car is first started?

Participating in science fair projects encourages the child to read and learn more about myriad subjects. Getting involved in your child’s academics will not only motivate the child but also help you develop a bond of trust and reliability. However, you need to support the child and not do the project for him. Doing the entire project by yourself will make your child handicapped and defeat the whole purpose of the science fair.

The above list science fair topics for 7th grade are extremely easy to do. Ask your child to write a script to explain to the viewers what the project is all about. The simpler the script, the easier it is for him to understand and to explain it. Science fair projects help a great deal in explaining scientific concepts in a jiffy.

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45 Cool Chemistry Experiments, Demos, and Science Fair Projects

Don’t forget your safety equipment!

Bunsen burners, colorful chemicals, and the possibility of a (controlled) explosion or two? Everybody loves chemistry experiments! We’ve rounded up the best activities, demos, and chemistry science fair projects for kids and teens. Try them in the classroom or at home.

Easy Chemistry Experiments and Activities for All Ages

Chemistry science fair projects.

These chemistry experiments and activities are all easy to do using simple supplies you probably already have. Families can try them at home, or teachers and students can do them together in the classroom.

Mix up some magic milk

Kids love this colorful experiment, which explores the concept of surface tension. This is one of our favorite chemistry experiments to try at home, since the supplies are so basic and the results are so cool!

Taste the Rainbow

Teach your students about diffusion while creating a beautiful and tasty rainbow. You’ll definitely want to have extra Skittles on hand so your class can enjoy a few as well!

Learn more: Skittles Diffusion

Crystallize sweet treats

Crystal science experiments teach kids about supersaturated solutions. This one is easy to do at home, and the results are absolutely delicious!

Learn more: Candy Crystals

Make elephant-sized toothpaste

This fun project uses yeast and a hydrogen peroxide solution to create overflowing “elephant toothpaste.” You can also add an extra fun layer by having kids create toothpaste wrappers for their plastic bottles.

Blow the biggest bubbles you can

Add a few simple ingredients to dish soap solution to create the largest bubbles you’ve ever seen! Kids learn about surface tension as they engineer these bubble-blowing wands.

Learn more: Giant Soap Bubbles

Demonstrate the “magic” leakproof bag

So simple and so amazing! All you need is a zip-top plastic bag, sharp pencils, and some water to blow your kids’ minds. Once they’re suitably impressed, teach them how the “trick” works by explaining the chemistry of polymers.

Learn more: Leakproof Bag

Use apple slices to learn about oxidation

Have students make predictions about what will happen to apple slices when immersed in different liquids, then put those predictions to the test! Finally, have them record their observations.

Learn more: Apple Oxidation

Float a marker man

Their eyes will pop out of their heads when you “levitate” a stick figure right off the table. This experiment works due to the insolubility of dry-erase marker ink in water, combined with the lighter density of the ink.

Learn more: Floating Marker Man

Discover density with hot and cold water

There are a lot of easy science experiments you can do with density. This one is extremely simple, involving only hot and cold water and food coloring, but the visuals make it appealing and fun.

Learn more: Layered Water

Layer more liquids

This density demo is a little more complicated, but the effects are spectacular. Slowly layer liquids like honey, dish soap, water, and rubbing alcohol in a glass. Kids will be amazed when the liquids float one on top of the other like magic (except it is really science).

Learn more: Layered Liquids

Grow a carbon sugar snake

Easy science experiments can still have impressive results. This eye-popping chemical reaction demonstration only requires simple supplies like sugar, baking soda, and sand.

Learn more: Carbon Sugar Snake

Make homemade bouncy balls

These homemade bouncy balls are easy to make since all you need is glue, food coloring, borax powder, cornstarch, and warm water. You’ll want to store them inside a container like a plastic egg because they will flatten out over time.

Learn more: Make Your Own Bouncy Balls

Create eggshell chalk

Eggshells contain calcium, the same material that makes chalk. Grind them up and mix them with flour, water, and food coloring to make your very own sidewalk chalk.

Learn more: Eggshell Chalk

Make naked eggs

This is so cool! Use vinegar to dissolve the calcium carbonate in an eggshell to discover the membrane underneath that holds the egg together. Then, use the “naked” egg for another easy science experiment that demonstrates osmosis .

Learn more: Naked Egg Experiment

Turn milk into plastic

This sounds a lot more complicated than it is, but don’t be afraid to give it a try. Use simple kitchen supplies to create plastic polymers from plain old milk. Sculpt them into cool shapes when you’re done.

Test pH using cabbage

Teach kids about acids and bases without needing pH test strips. Simply boil some red cabbage and use the resulting water to test various substances—acids turn red and bases turn green.

Learn more: Cabbage pH

Clean some old coins

Use common household items to make old oxidized coins clean and shiny again in this simple chemistry experiment. Ask kids to predict (hypothesize) which will work best, then expand the learning by doing some research to explain the results.

Learn more: Cleaning Coins

Blow up a balloon (without blowing)

Chances are good you probably did easy science experiments like this when you were in school yourself. This well-known activity demonstrates the reactions between acids and bases. Fill a bottle with vinegar and a balloon with baking soda. Fit the balloon over the top, shake the baking soda down into the vinegar, and watch the balloon inflate.

Learn more: Balloon Experiments

Assemble a DIY lava lamp

This 1970s trend is back—as an easy science experiment! This activity combines acid/base reactions with density for a totally groovy result.

Explore how sugary drinks affect teeth

The calcium content of eggshells makes them a great stand-in for teeth. Use eggs to explore how soda and juice can stain teeth and wear down the enamel. Expand your learning by trying different toothpaste and toothbrush combinations to see how effective they are.

Learn more: Sugar and Teeth Experiment

Mummify a hot dog

If your kids are fascinated by the Egyptians, they’ll love learning to mummify a hot dog. No need for canopic jars ; just grab some baking soda and get started.

Extinguish flames with carbon dioxide

This is a fiery twist on acid-base experiments. Light a candle and talk about what fire needs in order to survive. Then, create an acid-base reaction and “pour” the carbon dioxide to extinguish the flame. The CO2 gas acts like a liquid, suffocating the fire.

Send secret messages with invisible ink

Turn your kids into secret agents! Write messages with a paintbrush dipped in lemon juice, then hold the paper over a heat source and watch the invisible become visible as oxidation goes to work.

Learn more: Invisible Ink

Set popcorn dancing

This is a fun version of the classic baking soda and vinegar experiment, perfect for the younger crowd. The bubbly mixture causes popcorn to dance around in the water.

Learn more: Dancing Popcorn Experiment

Shoot a soda geyser sky-high

You’ve always wondered if this really works, so it’s time to find out for yourself! Kids will marvel at the chemical reaction that sends diet soda shooting high in the air when Mentos are added.

Learn more: Mentos and Coke Experiment

All of these chemistry experiments are perfect for using the scientific method. Form a hypothesis, alter the variables, and then observe the results! You can simplify these projects for younger kids, or add more complexity for older students.

Break apart covalent bonds

Difficulty: Medium / Materials: Medium

Break the covalent bond of H 2 O into H and O with this simple experiment. You only need simple supplies for this one. Turn it into a science fair project by changing up the variables—does the temperature of the water matter? What happens if you try this with other liquids?

Learn more: Breaking Covalent Bonds

Measure the calories in various foods

Are the calorie counts on your favorite snacks accurate? Build your own calorimeter and find out! This kit from Home Science Tools has all the supplies you’ll need.

Detect latent fingerprints

Forensic science is engrossing and can lead to important career opportunities too. Explore the chemistry needed to detect latent (invisible) fingerprints, just like they do for crime scenes!

Learn more: Fingerprints Project

Use Alka-Seltzer to explore reaction rate

Difficulty: Easy / Materials: Easy

Tweak this basic concept to create a variety of high school chemistry science fair projects. Change the temperature, surface area, pressure, and more to see how reaction rates change.

Determine whether sports drinks really have more electrolytes than other beverages

Difficulty: Medium / Materials: Advanced

Are those pricey sports drinks really worth it? Try this experiment to find out. You’ll need some special equipment for this one; buy a complete kit at Home Science Tools .

Turn flames into a rainbow

You’ll need to get your hands on a few different chemicals for this experiment, but the wow factor will make it worth the effort. Make it a science project by seeing if different materials, air temperature, or other factors change the results.

Discover the size of a mole

The mole is a key concept in chemistry, so it’s important to ensure students really understand it. This experiment uses simple materials like salt and chalk to make an abstract concept more concrete. Make it a project by applying the same procedure to a variety of substances, or determining whether outside variables have an effect on the results.

Learn more: How Big Is a Mole?

Cook up candy to learn mole and molecule calculations

This edible experiment lets students make their own peppermint hard candy while they calculate mass, moles, molecules, and formula weights. Tweak the formulas to create different types of candy and make this into a sweet science fair project!

Learn more: Candy Chemistry

Make soap to understand saponification

Take a closer look at an everyday item: soap! Use oils and other ingredients to make your own soap, learning about esters and saponification. Tinker with the formula to find one that fits a particular set of parameters.

Learn more: Saponification

Uncover the secrets of evaporation

Explore the factors that affect evaporation, then come up with ways to slow them down or speed them up for a simple science fair project.

Learn more: Evaporation

More Chemistry Experiment Science Fair Ideas

These questions and prompts can spark ideas for unique chemistry experiments:

• Compare the properties of sugar and artificial sweeteners.
• Explore the impact of temperature, concentration, and seeding on crystal growth.
• Test various antacids on the market to find the most effective product.
• What is the optimum temperature for yeast production when baking bread from scratch?
• Compare the vitamin C content of various fruits and vegetables.
• How does temperature affect enzyme-catalyzed reactions?
• Investigate the effects of pH on an acid-base chemical reaction.
• Devise a new natural way to test pH levels (such as cabbage leaves).
• What’s the best way to slow down metal oxidation (the form of rust)?
• How do changes in ingredients and method affect the results of a baking recipe?

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