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If the reaction is endothermic, then cooling will favor reactant formation; if the reactant is exothermic, then cooling will favor product formation. This occurs according to Le Châtelier's Principle, since the systems will adjust to minimize the temperature change.
It may help to think of heat as a reactant/product. For example, in an endothermic reaction, heat would be a "reactant" which means cooling would decrease the amount of reactants and therefore the formation of reactants would be favored.
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