Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Differentiate betweenpure and impure substances.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Pure substances
1. Pure substances have a definite composition and definite physical and chemical properties.
2. They are all homogeneous, i.e. their composition is uniform throughout the bulk.
3. Examples: Elements and compounds
Impure substances
1. Impure substances are made up of two or more pure substances mixed in any proportion.
2. They might be homogeneous or heterogeneous, i.e. their composition is not uniform throughout the bulk.
3. They are all mixtures. Examples: air, sea water, petroleum, a solution of sugar in water are all impure substances."