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==Key Stage 3==
===Meaning===
A [[catalyst]] is a [[chemical]] which can increase the [[Rate of Reaction|rate]] of make a [[Chemical Reaction|chemical reaction]] happen more quickly, without being used up in the [[reaction]].
===About Catalysts===
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: Since the [[particle]]s in the [[Reaction Mixture|reaction mixture]] will all have different amounts of [[energy]] (see [[Kinetic Theory]]), not all of them will have enough [[energy]] to [[Chemical Reaction|react]] when they [[collide]] (see [[Collision Theory]]). Adding a [[catalyst]] lowers this [[Activation Energy|activation energy]] so more [[particle]]s have enough [[energy]] to [[react]], increasing the [[Rate of Reaction|rate of reaction]].
: [[Enzyme]]s are a type of biological [[catalyst]] that can increase the [[Rate of Reaction|rate of reaction]]s inside an [[organism]].