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Is evaporation a chemical or physical change?

Answer 1

Evaporation is a physical change it is not a chemical change.

It is a physical change because it is going from the liquid phase to the gas phase. It is not a chemical change because it is still made of two hydrogen atoms and an oxygen atom.

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Answer 2

Wyatt Adkins

Physical.

Evaporation does not result in any chemical reaction, nor any breaking or making of chemical bonds. If you consider water before evaporation, it is #H_2O(l)#, if you then consider water after evaporation it is #H_2O(g)#. It is still #H_2O# - the molecule hasn't changed, all that has changed is the physical state.

A chemical change is one in which changes to chemical structure occur during the change, i.e. a chemical reaction occurs so that chemically different substances are present after the change, compared to before the change.

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Answer 3

Noah Aldrich

The process of evaporation is physical.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.