Question

difference between pure and impure substances

Answer 1

Answer:

Explanation:

Chemists define the term 'pure' as a chemical that is natural. This is a substance that is made up on one type of atom. If there is more than one type of atom, then that substance is called 'impure'. For example, a glass containing just water is pure.

Answer 2

Answer:

(a)

Pure substances -

1. Pure substances have 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 together in any proportion.

2. They may 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.

(b)

Homogeneous mixture - is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture.

Example - air, sugar water, rain water.

Heterogeneous mixture - is a mixture, where the components of the mixture are not uniform or have localized reglos with different properties.

Example - Cereal In milk, vegetable soup.