3. battery
electrolyte
electrochemical cell
reactants

4. What do a battery and a peanut have in common when we consider them as sources of energy?
Do you know what goes on inside a battery? Record your ideas in your notebook.

5. Electrolyte
Electrolyte – a material capable of conducting electricity that allows the current to flow as it releases from the reaction.

6. Read the introduction and look for key ideas

7. What combinations of metals makes the best battery to power a small motor?

8. Review the materials

9. Safety
Wear safety goggles at all times during this lab. Do not allow the solutions to touch your skin or clothing. Clean up any spills immediately. If accidental contact occurs, tell your teacher and rinse exposed areas. Wash your hands after completing the activity.

10. Complete procedure Part A: Testing the Motor
Be careful pouring the mixture into the SEPUP wet cell.

11. Complete procedure Part B: The Effects of Different Metals

12. SCORING GUIDE: Designing Investigations

13. Complete procedure Part C: Other Effects
Be sure to follow the Procedure and make a table in your notebook to record your results.

14. Share your data with the class
Do you have any idea why some combinations worked better than others in providing energy for the motor? Discuss your thoughts with the class.

15. Metals activity chart

16. Analysis question 1
Was there a chemical change when you inserted the strips into the electrolyte? Describe any evidence that supports your answer.

17. Analysis question 2
Use your results from Part B to rank the metal combinations below from 1 to 6, with 1 as the highest-ranking electrical energy rate, and 6 as the least. Describe any evidence that determined the ranking. Magnesium - copper Magnesium - iron Zinc - copper Zinc – magnesium Zinc – iron Copper - iron

18. Analysis question 3
Look at the table below that describes the reactivity of the metals in this activity. Compare the table to your responses in Question 2.
Based on the comparison:
Does reactivity alone indicate what combinations of metals will release the most energy?

19. Analysis question 3
Look at the table below that describes the reactivity of the metals in this activity. Compare the table to your responses in Question 2.
Based on the comparison:
What patterns do you see that could indicate why the most and least energy combinations occurred?

20. Analysis question 3
Look at the table below that describes the reactivity of the metals in this activity. Compare the table to your responses in Question 2.
Based on the comparison:
Gold is the least reactive metal known and tends not to give up electrons. Which metal from the table would you pair it with to make a strong battery? Explain your choice.

21. Analysis question 4
Make a table that summarizes your investigation in Part C. It should identify each effect, summarize the results, and include a brief explanation of why you think each result happened.

22. Analysis question 5
From the materials in this activity, draw and label a battery that would produce the most energy.

23. What combinations of metals makes the best battery to power a small motor?

24. Key vocabulary definitions
Battery – A device that provides electrical energy. It contains two or more chemical cells that generate a direct current through a chemical reaction. Electrolyte – A solution or pure liquid substance that forms ions to conduct an electrical current.

25. Key vocabulary definitions
Electrochemical cell - a device that transforms stored chemical (potential) energy to electrical energy. A common example of an electrochemical cell is a standard 1.5-volt battery used in flashlights, radios. cameras, etc. Reactants – The original substances that are present at the beginning of a reaction.

26. Design and conduct
Design and conduct an investigation that tests the effect of changing the concentration of the electrolyte.