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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.
If the concentration of either A or B is. doubled, the number of collisions between A and B per time is doubled. If the temperature is raised, the kinetic energies of both. A and B are increased so that there are more collisions per second, and a greater fraction of these will lead to chemical reaction. The rate, therefore, generally increases with increasing temperature. CATALYSIS. A catalyst can be thought of as an agent, which alters the speed of a chemical reaction.