State the differences between a pure substance and a mixture

CBSE Class 9
1

State the differences between a pure substance and a mixture. give one example of each.

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Pure substance Impure substance (Mixture)
1. A pure substance is a homogeneous material with a definite, invariable chemical composition. 1. Impure substances are mixtures of two or more elements or compounds or both.
2. A pure substance has definite invariable physical and chemical properties. 2. A mixture has no definite set of properties. They have properties in their different parts.
3. Components of a pure substance cannot be separated by physical methods of separations such as - magnetic separation, evaporation, etc. 3. Components of a impure substance can be separated by physical methods of separations such as - magnetic separation, evaporation, etc.
4. Examples of pure substances: water, Iron, oxygen , gold etc. 4. Examples of mixture: sugar solution, mixture of sand and iron nails etc.