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===Energy and State Changes===
: Changing state either needs energy to happen or releases stored energy when it happens.
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|[[File:EnergyStateChanges.png|center|500px]]
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| style="height:20px; width:200px; text-align:center;" |When [[energy]] is added by [[heat]]ing a [[solid]] will turn into a [[liquid]] and then a [[liquid]] will turn into a [[gas]]. When [[energy]] is taken away by cooling a [[gas]] will turn into a [[liquid]] and a [[liquid]] will turn into a [[solid]].
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*[[Melting]], [[Evaporating]] and [[Subliming]] are [[endothermic]] changes because they need [[energy]] to happen. The [[material]] has more [[energy]] at the end than it did the beginning.
*[[Freezing]], [[Condensing]] and [[Depositing]] are [[exothermic]] changes because it releases [[energy]] when it happens. The [[material]] has less [[after]] it has happened.
: When [[human]]s [[sweat]] the [[water]] [[evaporation|evaporates]] from the [[skin]] helping them cool down. This works because [[evaporation]] is an [[endothermic]] process so the [[sweat]] takes [[energy]] away from the [[skin]] when it [[evaporation|evaporates]].