what is exothermic reaction
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An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactionsusually release heat and entail the replacement of weak bonds with stronger ones. ... Most of the spectacular chemicalreactions that are demonstrated in classrooms are exothermic and exergonic.
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Exothermic reactions are those in which heat or light is evolved out .
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