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total enthalpy

1. Calculate the overall temperature change for the cold and hot pack substance. HINT: This is the difference in the maximum temperature and minimum temperature of each.

Cold pack ΔT:

Hand warmer ΔT:

2. Which pack works by an exothermic process? Use experimental data to support your answer.

The chemical reaction that releases heat is called an exothermic reaction, so a heat pack. The cold pack is endothermic

3. Which pack works by an endothermic process? Use experimental data to support your answer.

The cold pack is endothermic because Energy is drawn in from the external environment, causing its surroundings to loose heat, or “cool down.”

4. Which pack had the greatest change in enthalpy? How do you know?

Table 2: Hand Warmer Data

Table 1: Cold Pack Data