Exothermic/Endothermic Pack Lab

Exothermic/Endothermic Pack Lab

Pre-Lab ?’s
1. Explain the difference between an exothermic and endothermic reaction.

2. Is this a physical or chemical change? Explain why.

Lab ?’s:

1. Record the temperature of the thermometer before putting it in both packs. Make sure to use correct units.

2. Record the temperature of the thermometer after it is in the “cold” pack.

3. How does the “cold” pack feel to your hand?

4. Record the temperature of the thermometer after it is in the “hot” pack.

5. How does the “hot” pack feel to your hand?

6. Calculate the difference in temperature between the packs:

“Cold” pack temperature:      _______                        “Hot” pack temperature:        _______

Before temperature:                _______                        Before temperature:                _______

Difference in temperature     _______                       Difference in temperature     _______

7. Which pack involves an exothermic process? What is your evidence?

8. Which pack involves an endothermic process? What is your evidence?

9. Why did the temperature change around the packs? Explain what is happening to the molecules because of the packs.

10.  Explain why measuring the temperature with a thermometer is more effective than simply feeling the packs to identify the process.