CBSE Class 9 Answered

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.