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Is Matter Around Us Pure ? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?2 Marks
Question
What is the difference between a pure substance and a mixture? Give one example in each case.
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Answer

Pure substance: Matter that has the same composition and properties throughout is called a substance.
Eg: Pure water is a pure substance. It consist of only water molecules. 
Mixture: It is the combination of two or more pure substances where each substance retains its own identity.
Eg: Alcohol-water mixture, both co-exist together.

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