A pure substance will melt over a very narrowtemperature range.
An impure substance will melt over a broader, lower temperature range.
Chromatography is one way.
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Only by chemical analysis.
pure substance, propanone
Pure substance
it is a pure substance.... not
Methane is a pure substance.
pure substance
pure substance
Pure Substance
A pure substance is classified by having a definite and constant composition. The substance can be either an element or a compound, but what makes the substance pure, is that it does not vary.