Question

Explain the melting of solids on the bases of kinetic theory.

Answer 1

Part 1: Understanding the concept:

• According to the kinetic molecular theory of matter, the particles(atoms/molecules) are in a state of unending motion and as such have kinetic energy.
• Kinetic energy of these atoms/molecules is directly proportional to the temperature.

Part 2: Melting of solids

• The kinetic energy of particles increases as the temperature of solids rises.
• The melting point of a solid is the temperature at which it melts to become a liquid at atmospheric pressure.
• The kinetic energy of particles increases as solids' temperature rises.
• The particles begin to vibrate at a faster rate due to the increase in kinetic energy.
• The attraction forces between the particles are overcome by the energy supplied by heating it.
• Particles begin to move more freely after leaving their fixed locations.
• Finally, it reaches a certain stage, where solid start changing to liquid known as its melting point..