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•heat of reaction, the amount of heat that must be added or removed during a chemical reaction in order to keep all of the substances present at the same temperature. If the pressure in the vessel containing the reacting system is kept at a constant value,the measured heat of reaction also represents the change in the thermodynamic quantity called enthalpy, or heat content,
Breaking a chemical bond requires energy and therefore is Endothermic.Breaking a chemical bond requires energy and therefore is Endothermic.
•exothermic reaction is a chemical reaction that releases energy by light or heat.It is the opposite of an endothermic reaction.