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|[[File:ExothermicSketchGraphWithCatalyst.png|center|300px]]
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| style="height:20px; width:200px; text-align:center;" |The [[Activation Energy|activation energy]] is shown to be high in this "[[Reaction Profile|reaction profile" ]] for an [[exothermic]] [[Chemical Reaction|reaction]] without a [[catalyst]].| style="height:20px; width:200px; text-align:center;" |The [[Activation Energy|activation energy]] is shown to be low in this "[[Reaction Profile|reaction profile" ]] for an [[exothermic]] [[Chemical Reaction|reaction]] with a [[catalyst]].
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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]].