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Science glossary film: Exothermic

Exothermic

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A chemical reaction or process that releases heat.

A chemical reaction or process that releases heat. Burning coal, wood or other fuel in oxygen is a classic exothermic reaction. The formation of new chemical bonds in the products of the reaction releases more energy than required to break the bonds in the reactants, so the excess energy is released as heat.

Burning coal, wood or other fuel in oxygen is a classic exothermic reaction. The formation of new chemical bonds in the products of the reaction releases more energy than required to break the bonds in the reactants, so the excess energy is released as heat.

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