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When someone is injured, responding medical personnel may use either hot packs or cold packs to treat the injuries. These are examples of miniature chemical reactions. Using hot packs and cold packs as an example, explain the terms endothermic reaction and exothermic reaction.

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Explanation:

An endothermic reaction is one that requires energy in the form of heat, which you observe from the outside as the chemical getting cold (like in a cold pack). An exothermic reaction is the opposite, generating heat on its own through the reaction (like in a hot pack).

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answer; 4 electrons;