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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.
Not all chemical reactions are created equal. Some are naturally fast, such as when you put a flame to hydrogen in the presence of oxygen in the pop test. Some are naturally slow, such as iron rusting in the presence of oxygen and water. Things that affect chemical reaction rates. Itâs possible to speed up or slow down the rate of a reaction by changing one or more of three things: temperature. particle size. concentration of reactants.