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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.
When molecules of any kind of atoms get more energy in them than they had before, they move faster, and we call that heat. When the molecules move faster, they hit against each other and bounce apart, and so they end up further apart from each other than they were before.