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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.
At higher temperatures, the molecules of the reactants move faster; therefore, collisions occur more frequently, a higher percentage of collisions are effective, and the reaction rate increases. A general rule of thumb is that on average, the reaction rate doubles for every 10Â°C rise in temperature.n this experiment, you will study various conditions and the effect they have on the collision of molecules. You will observe the effects of temperature, concentration, particle size (surface area), and catalysts on the rates of chemical reactions and then explain these effects in terms of the collision theory.