Regardless of how much energy is ultimately created or used up by a chemical reaction, a certain amount of energy called the activation energy must first be invested to start the reaction. Catalysts help chemical reactions occur by lowering this activation energy, allowing for the reaction to occur far more frequently and require less energy in the short run. Catalysts are never exhausted when used in this way, so they can be used over and over to facilitate numerous consecutive reactions occur.
Catalysis is the action to increase the reaction rate of a chemical reaction using substances called catalysts which are not transformed during this reaction.
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but all catalysts aren't enzymes...
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Enzymes are catalysts.