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InterviewSolution
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Why does heat get released`//` absorbed during chemical reactions? |
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Answer» Because the reactant have a fixed enthalpy content before the reaction and when these are converted into the products which have a different enthalpy content. So, heat gets released or absorbs. Even if temperature of reactions remains constant yet due to change in bonding energies `Delta E != 0`. If `H_("Product") gt H_("reactants")` Reaction should be endothermic as we have to give extra heat to reactants to get these converted into products and if `H_("Product") lt H_("reactants")` Reaction will be exothermic as extra heat content of reactant will be released during the reaction. Enthalpy change of a reaction: `Delta H_("reaction") = H_("products")-H_("reactant")` `{:(DeltaH_("reactions"),H_("products"),-H_("reactants"),,),(,="positive",-,"endothermic",),(,="negative",-,"exothermic",):}` |
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