![]() Only very minute quantities of the catalyst are required to produce a dramatic change in the rate of the reaction. How do catalysts affect the rate of a reaction? Catalysts speed up chemical reactions. If your reaction is between atoms rather than molecules you just substitute "atom" for "molecule" in your explanation. Increasing temperature means the molecules move faster. By heating the mixture, you will raise the energy levels of the molecules involved in the reaction. The two molecules will only react if they have enough energy. How does temperature affect the rate of a chemical reaction? When two chemicals react, their molecules have to collide with each other with sufficient energy for the reaction to take place. ![]() Light of a particular wavelength may also speed up a reaction ![]() Check your class notes - there should be a graph with the effect of various catalysts upon the decomposition of hydrogen peroxide draw it in below. A catalyst speeds up a reaction, an inhibitor slows it down.
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