Question

Give the postulates of the kinetic molecular theory of matter. Explain the process of melting on the basis of this theory.

Answer 1

Postulates of Kinetic molecular theory:

• Matter in general is made up of very small particles commonly known as atoms or molecules.
• Similar kinds of matter have simial constituents.
• There exist the space between molecules of matter and the space is known as intermolecular space.
• The force of attraction between the molecules holds them together and the force is known as the intermolecular force of attraction.
• The particles in the matter are always in random motion which means they possess kinetic energy.

The process of melting on the basis of this theory:

• Kinetic energy increases with increases in temperature.
• This increase in temperature will provide help in overcoming the force of attraction between molecules.
• As the molecules in the matter overcome the force of attraction they start moving freely.
• A point will be reached where the solid will melt.