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An exothermic reaction is a chemical reaction that releases heat or energy to its surroundings during its progress. It usually feels warm or hot to touch.
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Endothermic Reaction: A chemical reaction that absorbs heat or energy from its surroundings, making the surroundings feel cooler.
Activation Energy: The minimum amount of energy required for a chemical reaction to occur.
Enthalpy: The total heat content of a system at constant pressure, including both internal energy and the work done by the system on its surroundings.