arosa261 arosa261

15-03-2021
Chemistry

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A pure substance that is present before a reaction but not after
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GeorgeFocus GeorgeFocus

15-03-2021

Explanation:

Pure subsance is a substance that is made up of only one type of particle - each piece is the same throughout.

Being present before the reaction but not after means it's no the same (it couldve evaporated)

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