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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.
At the molecular level, there is no friction. Similarly, if we want to break chemical bonds, we add energy also in the form of heat. The molecules speed up, the temperature rises, and the bond begin to break as a result of the more violent collisions between molecules.