when the products of a reaction have a lower enthalpy than the reactants, the reaction is endothermic and the change in enthalpy is positive.
In Endothermic Reactions, heat is absorbed from the surroundings. This energy is required for the breakage of bonds so that the reaction can proceed. The overall temperature of the surroundings is decreased.
When heat is absorbed in a system the system has higher enthalpy at the end of the reaction. The change in enthalpy is positive when the reaction is endothermic.
Dissolution of ammonium chloride into water is an example of endothermic reactions.
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