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10 May, 07:52

A water molecule gains enough energy to enter the gas phase is chemical or physical? why?

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  1. 10 May, 08:31
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    Physical because you are not changing the substance. For example water vapor (gas) can be condensed back into water. If you burn a piece of paper the ash cannot be changed back into paper therefore it is chemical. But because you are not changing the substance the answer is physical.
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