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: The different size [[particle]]s causes them to fit together in different arrangements in a [[solid]].
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===Chemical Reactions in the Particle Model===
: During a [[Chemical Reaction|chemical reaction]] [[atom]]s are rearranged into new [[compound]]s. The '''particle model''' explains how [[temperature]] and [[pressure]] affect the rate of [[Chemical Reaction|chemical reactions]].
: In the '''particle model''' the [[particle]]s [[collide]] with one another.
: If [[particle]]s [[collide]] with enough [[Kinetic Energy|kinetic energy]] it can break the [[Chemical Bond|chemical bond]]s holding the [[atom]]s to each other in a [[molecule]].
: When [[collision]]s have caused [[molecule]]s to break apart they can join back together in a new arrangement.
====Temperature and Chemical Reactions====
: When the [[temperature]] of a [[substance]] is increased it causes the [[particle]]s to move around faster, with greater [[Kinetic Energy|kinetic energy]].
: As [[temperature]] increases the [[particle]]s [[collide]] more often and with greater [[Kinetic Energy|kinetic energy]].
: When [[particle]]s [[collide]] more often it means a greater chance of the [[Chemical Bond|chemical bond]]s breaking and [[atom]]s rearranging into new [[compound]]s.
: When [[particle]]s have a large [[Kinetic Energy|kinetic energy]] during a [[collision]] they are more likely to have enough [[energy]] to break the [[Chemical Bond|chemical bonds]] holding [[atom]]s in the [[molecule]]s together.
====Pressure and Chemical Reactions====