why do the properties of a pure substance not vary

The properties of a pure substance do not vary from sample to sample because there is no reason for them to. Why would they? Water is water, and if you take any sample of wate
r from any stream, lake or ocean and remove all the "stuff" in it to leave only the water, all the samples will behave the same way physically and chemically.   The chemical properties of a substance (and the physical ones, too) are set by what the substance is.


And these properties define the way the substance behaves in the universe as a whole.


There is no reason for any water found on, say Mars, to behave any differently than any water here on Earth - or anywhere else in the universe.


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