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If the reaction is endothermic, then heating higher than 25 C favors the forward reaction and creates more product. If the reaction is exothermic, then cooling to less than 25 C favors product formation, while heating will favor reactant formation.
An increase in temperature in endothermic reactions would favor product formation, since it requires energy or heat for the products to form. Furthermore, in an endothermic reaction an increase in temperature would cause an increase in K, and thus more product formation. This effect is the opposite when looking at exothermic reactions. A decrease in temperature in endothermic reactions would favor reactant formation, since taking away the energy or heat in this reaction would not provide enough energy for product formation, thus decreasing K. This effect is the opposite when looking at exothermic reactions.
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