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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.
Chemical reactions occur when a particular part of one element or molecule meets a particular part of another element or molecule.The reaction works similar to putting a key in a lock. elements and molecules move much faster at high temperatures than they do at slower temperatures.When they move faster, they bounce into each other many more times. Thus, they have many more opportunities to hit the spot where the chemical reaction will occur.lements and molecules move much faster at high temperatures than they do at slower temperatures. When they move faster, they bounce into each other many more times. Thus, they have many more opportunities to hit the spot where the chemical reaction will occur.