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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.
Answered by The Community. Making the world better, one answer at a time. Lowered temperature lowers reactants speeds, and decreased the number of low-energy collision, reaction rates decrees with a decrease in temperature.he reaction works similar to putting a key â¦ 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.