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===Surface Area and Collision Theory===
The [[Particle Model]] [[explain]]s how [[particle]]s in a [[solid]] [[vibrate]] around fixed positions. This means most of those [[particle]]s cannot [[collide]] with other [[reactant]]s. It is only the [[particle]]s on the surface of the [[solid]] that can have other [[reactant]]s [[collide]] with them. Therefore the larger the [[Surface Area|surface area]] the more frequently [[reactant]] [[particle]]s in a [[gas]] or [[liquid]] will [[collide]] with the [[reactant]] [[particle]]s in the [[solid]], increasing the [[Rate of Reaction|rate of reaction]].
===Catalysts and Collision Theory===
[[Catalyst]]s can provide different [[Reaction Pathway|reaction pathways]] so that [[particle]]s of [[reactant]]s may not need to [[collide]] for a [[reaction]] to occur. Instead the [[reactant]]s may [[collide]] with the [[catalyst]]. For instance a [[reactant]] may pass on an [[electron]] to a [[catalyst]] which then passes that [[electron]] on to the other [[reactant]] resulting in the same product, but without the two [[reactant]]s [[colliding]] with one another.