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Question:

A coach takes a cold pack and pops the container inside. The following data table shows the temperature of the pack as time goes on. This reaction is an example of what type of reaction?

A Endothermic
Explaination

Endothermic reactions cause something to become cold, while exothermic reactions cause something to become hot. Subjective is not a reaction, and heat of vaporization is when water becomes a gas.