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==Key Stage 3==
===Meaning===
A [[catalyst]] is a [[chemical]] which can increase the [[Rate of Reaction|rate ]] of a [[Chemical Reaction|chemical reaction]] without being used up in the [[reaction]].
===About Catalysts===
: A [[catalyst]] is neither are [[reactant]] or nor a [[product]] in a [[Chemical Reaction|reaction]] but it can make the [[Chemical Reaction|reaction]] happen more quickly.
===Examples===
: [[Manganese Dioxide]] is a [[catalyst]] that speeds up the break down of [[Hydrogen Peroxide]] into [[Water]] and [[Oxygen]].
: [[Enzyme]]s are a type of biological [[catalyst]] that can speed up [[Chemical Reaction|reaction]] inside an [[organism]].
==Key Stage 4==
===Meaning===
A [[catalyst]] is a [[chemical]] which can increase the [[Rate of Reaction|rate of reaction]] and lower the [[Activation Energy|activation energy]] for a particular [[Chemical Reaction|reaction]].
===About Catalysts===