define exothermic change ????
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An exothermic reaction is a chemical reaction where the substances reacting release energy as heat. ... The reaction that does the complete opposite (it absorbs heat) is an endothermic reaction. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter
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an exothermic reaction is a ' reaction for which the overall standard enthalpy change ∆H° is negative.
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