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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.
Technically, it isn't heat that makes a chemical reaction happen. Heat is merely the flow of energy from one place to another. It is the energy itself that causes a reacti â¦ on to occur. As an increase in temperature occurs, there is an increase in the energy in a group of molecules by making them mover around faster and bum into each other more.