How can I identify exothermic and endothermic reactions? What am I supposed to ask myself?

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In order to determine if a reaction is endothermic or exothermic you should ask yourself if energy is being transferred from the surroundings to the system or from the system to the surroundings.

Endothermic reactions absorb energy from the surroundings. A chemical ice pack that gets cold when two components are mixed and is then used to treat an injury is an example of an endothermic reaction. It cools your...

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