a.

Solid particles dispersed in liquid

b.

Solid or liquid particles dispersed in gas

c.

Gas or liquid particles dispersed in liquid

d.

Liquid particles dispersed in liquid

a.

Nitrogen and carbondioxide

b.

The rare gases

c.

Nitrogen and oxygen

d.

Nitrogen and the rare gases

a.

Ethene

b.

Propane

c.

Methane

d.

Butane

a.

Conservation of mass

b.

Definite proportions

c.

Multiple proportions

d.

Conservation of energy