Question

A) label 1 and 5
b) difference between pure and impure substances
c) what are natural elements
d) give an example of homogeneous mixture ​

Answer 1

$\mathfrak{\huge\underline{Answer:}}$

A.) 1 is Element ,

2 is Compounds ,

3 is Non metals

5 is Heterogeneous mixture

B.) Pure substance -

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.

C.) Natural elements are those elements that have been produced by nature, without the intervention of man. Eg. soil, air, water,etc.

D.) Examples include blood, alcohol with water, Sugar solution,etc.