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When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
This reaction is classified as â endothermic â. Because heat is absorbed, the. temperature of the reactants will be greater than the temperature of the products. When heat is given off during a chemical reaction, the reaction is classified as. âexothermic â. Such reactions release stored chemical en ergy resulting in an increase in. temperature. The temperature of the reactants is less than the temperature of the. products.