Author: Nathan Lampson
This lesson will describe that a catalyst is something which can speed up a reaction by lowering activation energy.
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Introduction to Psychology

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Chemical reactions require energy in order to begin. The amount of energy required in order for a chemical reaction to take place is called the activation energy.  

Catalysts speed up chemical reactions by lowering the activation energy required. 

Lactase is a catalyst called an enzyme that is found in the human body.  Lactase speeds up chemical reactions that break dairy products down into simple sugars that can be used by the body.