Question

State any one difference between pure and impure substances.​

Answer 1

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A pure element or compound contains only one substance, with no other substances mixed in. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.

Answer 2

Pure substances

Pure substances have definite composition and definite physical and chemical properties.

They are all homogeneous i.e. their composition is uniform throughout the bulk.

Examples:

Impure substances

Impure substances are made up of two or more pure substances mixed together in any proportion.

They may be homogeneous or hetergeneous i.e. their composition is not uniform throughout the bulk.

They are all mixtures.

Examples: air, sea water, petroleum, a solution of sugar in water are all impure substances.