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: When the [[bond]]s between [[particle]]s in a [[solid]] or a [[liquid]] are broken the [[particle]]s gain [[Potential Energy|potential energy]]. This is an [[endothermic]] process because it needs [[energy]].
: When [[bond]]s are formed between [[particle]]s in a [[gas]] or a [[liquid]] the [[particle]]s lose [[Potential Energy|potential energy]]. This is an [[exothermic]] process because [[energy]] is given off.
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''State changes, page 3, GCSE Chemistry, Pearson, Edexcel '']