1. Variables Practice As you proceed through these slides…write down what you think the answers are to the questions before you click the next slide to see the answers.

2. Problem: How does the amount of chemicals added to water affect the temperature of the water?  What is the independent variable? Click to see answer

3. Problem: How does the amount of chemicals added to water affect the temperature of the water?  Answer—Amount of chemicals added to water Click to proceed to next question

4. Problem: How does the amount of chemicals added to water affect the temperature of the water?  What is the dependent variable? Click to see answer

5. Problem: How does the amount of chemicals added to water affect the temperature of the water?  Answer—Temperature of water Click to proceed to next question

6. Problem: How does the amount of chemicals added to water affect the temperature of the water?  Set up an IVCDV chart Click to see a possible IVCDV chart

7. IV Constants DV Amount of chemicals added to water Temperature of water  Amount of water  Room temperature  Test tube  Thermometer Click to proceed to next question

8. Problem: How does the amount of chemicals added to water affect the temperature of the water?  Write a hypothesis for this problem using the IVCDV chart. Click to see possible answer

9. Problem: How does the amount of chemicals added to water affect the temperature of the water?  Hypothesis--If the amount of chemicals added to water is increased, then the temperature of the water will (increase, decrease, etc). Click to proceed to next question

10. IV Constants DV Amount of chemicals added to water Temperature of water  Amount of water  Room temperature  Test tube  Thermometer 0 mL 1 mL 2 mL 3 mL Looking at the IVCDV chart…what would be the Control Group? Click to see answer

11.  The test tube with 0 mL of the chemical added…it’s used for comparison to see how much the temperature changes. Click to proceed to the next question

12. IV Constants DV Amount of chemicals added to water Temperature of water  Amount of water  Room temperature  Test tube  Thermometer 0 mL 1 mL 2 mL 3 mL Click to see answer Looking at the IVCDV chart…what would be the Experimental Group?

13.  The test tube with 1 mL, 2 mL and 3 mL of the chemical added…they include the independent variable. Click to proceed to the next question

14. Imagine doing an experiment where you take a rubber band and add weights to it to see how much it stretches.  Problem: How does adding mass to a rubber band affect how much it stretches?  Make a possible IVCDV chart for this experiment. Click to view possible IVCDV chart

15. IV Constants DV Amount of mass added Length (or stretch) of rubber band  Same rubber band  Same room temperature  Same size masses Click to proceed to next question

16. IV ConstantsDV Amount of mass added Length (or stretch) of rubber band  Same rubber band  Same room temperature  Same size masses Click to view answer 0 grams 50 grams 100 grams 150 grams What is the control group?

17. The control group would be measuring the length of the rubber band without any mass added to it. Click to proceed to next question

18.  What is the experimental group? Click to view answer

19.  The experimental group would include measuring the length of the rubber band with 50 g, 100 g and 150 g masses added. Click to proceed to next question

20. Problem: How does adding mass to a rubber band affect how much it stretches?  Write a possible hypothesis for this problem. Click to view answer

21.  Hypothesis:  If mass is added to a rubber band, then the rubber band length will increase (or decrease, stay the same). Click to end