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===About State Changes===
: '''State changes''' are [[reversible]] because after a '''state change''' the [[material]] can be returned to its original form with the same [[property|properties]] as it started with.
: '''State changes''' happen when a [[substance]] gains enough [[energy]] to break the [[bond]]s holding [[particle]]s together or loses enough [[energy]] for [[bond]]s to form between [[particle]]s.
: When the [[bond]]s between [[particle]]s in a [[solid]] or a [[liquid]] are broken the [[particle]]s gain enough [[Potential Energy|potential energy]] to break the . This is an [[bondendothermic]]s holding them in fixed positions the process because it needs [[substanceenergy]] becomes a .: When [[liquidbond]].: When the s are formed between [[particle]]s in a [[gas]] or a [[liquid]] gain enough the [[particle]]s lose [[Potential Energy|potential energy]] to break the [[bond]]s keeping them together the . This is an [[substanceexothermic]] becomes a process because [[gasenergy]]is given off.
====Edexcel====