Endothermic and exothermic describe the direction energy is transferred between the system and the surroundings.
The system is the reactants and products, and the surroundings are everything else (introduced in R1.1.1).
This energy is usually transferred as heat, so these reactions show up as a temperature change you can measure.
Exothermic reactions
Energy is released from the system into the surroundings, increasing the temperature of the surroundings.
Endothermic reactions
Energy is absorbed by the system from the surroundings, decreasing the temperature of the surroundings.
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