Differentiate between pure and impure substances.

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Solution

Differences between pure and impure substances:
Pure substances Impure substances
Pure substances have definite composition and definite physical and chemical properties. Impure substances are made up of two or more pure substances mixed together in any proportion.
Pure substances are all homogeneous i.e. their composition is identical throughout the bulk. They may be homogeneous or heterogeneous i.e. their composition is not fixed throughout the bulk.
Pure substances have definite melting and boiling points. They are all mixtures. It does not have definite melting and boiling points.
Examples: Elements and compounds. Examples: Air, seawater, petroleum, and a solution of sugar in water are all impure substances.

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Pure substances	Impure substances
Pure substances have definite composition and definite physical and chemical properties.	Impure substances are made up of two or more pure substances mixed together in any proportion.
Pure substances are all homogeneous i.e. their composition is identical throughout the bulk.	They may be homogeneous or heterogeneous i.e. their composition is not fixed throughout the bulk.
Pure substances have definite melting and boiling points.	They are all mixtures. It does not have definite melting and boiling points.
Examples: Elements and compounds.	Examples: Air, seawater, petroleum, and a solution of sugar in water are all impure substances.