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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.
Increases in the temperature of a system results from increases in the kinetic energy of the system. This has several effects on the rates of reactions. 1) More energetic collisions. When molecules collide, the kinetic energy of the molecules can be converted into chemical potential energy of the molecules.If the chemical potential energy of the molecules become great enough, the activation energy of a exergonic reaction can be achieved and a change in chemical state will result.s the temperature of a system is increased it is possible that more molecules per unit time will reach the activation energy. Thus the rate of the reaction may increase. 2) The number of collisions per unit time will increase.