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Identifying controls & variables practice worksheet key (1)
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Arif Hanafi
Rahul Reddy
pushpa sanyasi
Byeong-Wook Min
Lupcho Temelkovski
Kaushik Rudra
Quiz # (1), Time: 45 min. (Section 20) 1. Differentiate between significance of pollution type in developing and industrialized countries. Support your answer with some examples. [2 marks] • In developing countries, microbial pollution is more significant o Examples: cholera, typhoid, dysentery, malaria, bilharziasis • In industrialized countries, microphysicochemical pollution is more significant o Examples: cancer, leukemia, cardiovascular disorders 2. The following concentrations of water quality parameters were listed on a water bottle: Sulphate (SO4 2-) = 20 mg/L, and Bicarbonate (HCO3-) = 30 mg/L. Convert the above concentrations to Molarity, Normality and Mole Fraction. [5 marks] For Sulphate (SO4 2-): [2 marks] Molarity = 20 (mg/L) / 96 (mg/mmol) = 0.208 mmol/L = 2.08 x 10-4 M Normality = n.M = 2*2.08 x 10-4 = 4.16 x 10-4 eq/L = 4.16 x 10-4 N For Bicarbonate (HCO3-): [1.5 marks] Molarity = 30 (mg/L) / 61 (mg/mmol) = 0.492 mmol/L = 4.92 x 10-4 M Normality = n.M = 1*4.92 x 10-4 = 4.92 x 10-4 eq/L = 4.92 x 10-4 N For mole fraction: [1.5 marks] x SO4 = (0.02/96) / [(0.02/96) + (0.03/61) + (999.95/18)] = 3.75 x 10-6 x HCO3 = (0.03/61) / [(0.02/96) + (0.03/61) + (999.95/18)] = 8.85 x 10-6 x H2O = (999.95/18) / [(0.02/96) + (0.03/61) + (999.95/18)] = 0.99999 3. In a solid determination experiment, the following data was provided: Total solids = 400 mg/L, Total volatile solids = 150 mg/L, Volatile dissolved solids = 80 mg/L, and Fixed dissolved solids = 200 mg/L. Determine (i) Total suspended solids and (ii) Volatile suspended solids. [3 marks] TS = TFS + TVS 400 = TFS + 150 TFS = 250 mg/L [0.5] TDS = FDS + VDS TDS = 200 + 80 = 280 mg/L [0.5] TS = TSS + TDS 400 = TSS + 280 TSS = 120 mg/L (i) [1] TVS = VSS + VDS 150 = VSS + 80 VSS = 70 mg/L (ii) [1]
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Identifying Variables Worksheet & Answers
Subject: Primary science
Age range: 11-14
Resource type: Lesson (complete)
Last updated
29 October 2022
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Worksheet + Answers Set!
This worksheet focuses on core science skills required for identifying the independent, dependent, and controlled variables in science reports and experiments.
The lesson includes a teacher-guided component and two activity worksheets for students to practice their skills along with a sample answer set for teachers to print, teach and go!
For more science report writing skills worksheets, check out my TES store!
*This activity was structured using teaching programs, ensuring its alignment to the Australian NSW NESA syllabus and learning outcomes. Such outcomes include SC4-8WS and SC4-9WS from the Stage 4 Science Syllabus.
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**Science Report Skills Worksheet Bundle + Answers Set!** Clear the confusion and misconceptions around writing scientific reports for students! The lessons include a teacher-guided component and an activity for students to practice their skills along with a sample answer set for teachers to print, teach and go! This bundle includes worksheets on writing- 1. Aim 2. Hypothesis 3. Materials & Risk Assessment 4. Variables 5. Method 6. Choosing the right graph 7. Assessing reliability, accuracy & validity 8. Bibliography For more awesome worksheets, check out the other items on my TES store! *This activity was structured using teaching programs, ensuring its alignment to the Australian NSW NESA syllabus and learning outcomes. Such outcomes include SC4-8WS and SC4-9WS from the Stage 4 Science Syllabus.
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Identify the Controls and Variables
There is a new version of this resource !
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
Identify the:
1. Control Group
2. Independent (Manipulated) Variable
3. Dependent (Responding) Variable
4. What should Smithers' conclusion be?
5. How could this experiment be improved?
Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to check this this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower.
6. What was the initial observation?
Identify the-
7. Control Group
8. Independent (Manipulated) Variable
9. Dependent (Responding) Variable
10. What should Homer's conclusion be?
Bart believes that mice exposed to radiowaves will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice near a radio for 5 hours. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. he found that 8 out of 10 of the radiowaved mice were able to push the block away. 7 out of 10 of the other mice were able to do the same.
Identify the: 11. Control Group
12. Independent (Manipulated) Variable
13. Dependent (Responding) Variable
14. What should Bart's conclusion be?
15. How could Bart's experiment be improved?
More Resources on the Scientific Method
New version of Controls and Variables with the Simpsons Highlight the Variables Penny Lab - Soap and Surface Tension Fortune Telling Fish Investigation with Alka Seltzer Tablets
IMAGES
VIDEO
COMMENTS
6. Constants: variables that are not changed in the control group and experimental group; they remain the same in both groups.__ 7. Trials: each time an experiment is run _____ 8. Variables (use a dictionary if necessary): traits that can be changed in the experiment_ Practice: Write a hypothesis for each of the statements and identify the ...
SIN 301: Understand the methods and tools used in a simple experiment; SIN 403 - Identify a control in an experiment CCSS: RST 11-12.8; WHST.9-10.9 ... Identifying Variables & Experimental Design (Practice) KEY Teacher: Mr. Qadri For the following, a brief description of an experiment is given; define/identify the (I.V.) independent variable,
3 - Marshmallow Muscles. Larry was told that a certain muscle cream was the newest best thing on the market and claims to double a person's muscle power when used as part of a muscle-building workout. Interested in this product, he buys the special muscle cream and recruits Patrick and SpongeBob to help him with an experiment.
Identifying Variables Worksheet Instructions: For the following experiments, identify and describe the (IV) independent variable, (DV) dependent variable, (CG) control group, and (Con) the constant. 1) Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of an experiment.
Variables, Constants, and Controls . When it comes to conducting a scientific experiment there are three components that are very important. They are variables, constants, and controls. Let's take a look at each: Variables - These are the aspects of the experiment that change. There are two types of variables: dependent and independent.
Independent Variable The variable that is changed in the experiment. This variable is being tested. Dependent Variable The variable that changes as a result of change in the independent variable. This is what you are observing. Control Group Only one conditionis being changed at a time. Experimental Group The test group.
Created Date: 1/13/2016 8:58:57 AM
Identifying Variables - Practice 1 Read the following experimental scenarios and identify the variables. 1. It is January and Haley, Sarah and Becky are tired of having cold feet while waiting for the school bus to come in the morning. They decide to design an experiment to test the effectiveness of wool, cotton and nylon as insulators.
Part II: For each of the statements identify the variables, control group, and experimental group. In the experimental group, make sure to identify the constants. 1. Eating breakfast increases performance in school. Independent Variable: Dependent Variable: Control Group: Experimental Group w/ Constants: 2. Salt in soil affects plant growth.
8. Variables (use a dictionary if necessary): _____ Practice: Write a hypothesis for each of the statements and identify the variables, control group, and experimental group. 1. Cigarette smoking increases the risk of lung cancer.
A control group is treated exactly like the experimental group except for the independent variable being studied. The paragraphs below describe an observation, a question, and an experiment. For each of the experiments, identify the following: a. control group b. independent variable c. dependent variable d. conclusion(s)
Experimental Design: Identifying Controls and Variables. Define the following terms: Independent variable: factor in an experiment that is actively manipulated by the experimenter. Dependent variable: factor in an experiment that is changed due to changes in the independent variable. Control: factors in an experiment that are kept consistent.
Practice: Answer Key: Study Guide 2012: Experimental Design and Scientific Inquiry. Worksheet: Identifying Controls & Variables Independent Variable - the variable you purposely change - variable "I" control - also called the "manipulated" variable. THINK OF THIS AS THE CAUSE IN THE EXPERIMENT.
Scientific Method Review Identifying Variables Worksheet: For the following experiments, define the IV (independent variable), DV (dependent variable), and CV (control variable (s)). 1. Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment.
The scientific method involves designing experiments to test hypotheses. It requires identifying: 1) A change variable that is intentionally altered between trials. 2) A responding variable that is measured to see the effects of the change variable. 3) Control variables that could also influence the responding variable and must be kept constant.
NAME _____ Practice: Answer Key: Study Guide 2012: Experimental Design and Scientific Inquiry Worksheet: Identifying Controls & Variables Independent Variable - the variable you purposely change - variable "I" control - also called the "manipulated" variable. THINK OF THIS AS THE CAUSE IN THE EXPERIMENT. Dependant Variable - the factor that you measure or may change as a result ...
pdf, 349.17 KB. Worksheet + Answers Set! This worksheet focuses on core science skills required for identifying the independent, dependent, and controlled variables in science reports and experiments. The lesson includes a teacher-guided component and two activity worksheets for students to practice their skills along with a sample answer set ...
Variables, Constants, and Controls When it comes to conducting a scientific experiment there are three components that are very important. They are variables, constants, and controls. ... If you see the same changes in your experimental and control groups it means that the changes were not a result of your independent variable. Try an activity ...
Practice: Answer Key: Study Guide 2012: Experimental Design and Scientific Inquiry. Worksheet: Identifying Controls & Variables. Independent Variable - the variable you purposely change - variable "I" control - also called the. "manipulated" variable. THINK OF THIS AS THE CAUSE IN THE EXPERIMENT. Dependant Variable - the ...
Identify the types of variables in each written statement. READ CAREFULLY! A study was done to find if fuel types affect the engine's performance in a car. Independent Variable: fuel type Dependent Variable: engine performance Constants: car, driver, driving location and speed. An experiment was performed to determine the health effects of ...
Simpsons Variables Worksheet. Smithers thinks that a special juice will increase the productivity of workers. He creates three groups of 50 workers each and assigns each group the same task, to staple sets of papers. Group 1 drinks 100mL of the special juice while they work. Group 2 drinks 50mL of the special juice while they work.
Name: Experiments: Identifying Variables In each of the examples, identify the independent variable and dependent variable as well as which participants make up the experimental group and which make up the control group. Remember: Independent Variable = What the investigator manipulates; the particular treatment or condition the investigator is most interested in the effects of
Identify controls and variables within the scenarios. Identify the Controls and Variables . There is a new version of this resource ! Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of ...