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→About Chemical Reactions
: '''Chemical reactions''' often need some [[energy]] to start, like [[combustion]] where the [[fuel]] needs to be [[Heat|heated]] to start.
: If a '''chemical reaction''' gives off more energy than it needs to start then it is called an [[exothermic]] '''reaction'''. In these '''reactions''' the [[temperature]] increases.
: If a '''chemical reaction''' takes in more energy than it gives out then it is called an [[Endothermicendothermic]] '''reaction'''.
In these '''reactions''' the [[temperature]] decreases.