Question

Define and explain : 

(1) Homogeneous system 

(2) Heterogeneous system.

Answer 1

(1) Homogeneous system : A system consisting of only one uniform phase is called a homogeneous system.

Explanation :

(1) The properties of homogeneous system are uniform throughout the phase or system.

(2) The homogeneous systems are :

• Solutions of miscible liquids (water and alcohol) or soluble solids in liquids, (NaCl in water), etc.
•  Mixture of gases. H₂ and N₂, NH₃ and H₂, etc.

(2) Heterogeneous system : A system consisting of two or more phases separated by interfacial boundaries is called a heterogeneous system. 

Explanation : 

These systems are :

• Mixture of two or more immiscible liquids. E.g. Water and benzene. 
• Solid in equilibrium with liquid. E.g. Ice ⇌ water. 
• Liquid in equilibrium with vapour. E.g. Water ⇌ vapour.