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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.
No, an increase in temperature will speed up the reaction. This is because the heat energy is transferred into kinetic energy (movement energy) in the reactors and this increa â¦ ses their speed and so increases the rate at which they collide with each other, increasing the rate of the chemical reaction.aking the world better, one answer at a time. the increase of temperetare increases the rate of chemical reactions when its endorthemic reactions but exorthemic reaction lead to backward reaction.