Question

4. Explain the processes of melting, boiling
and sublimation on the basis of the kinetic
theory.​

Answer 1

Melting

On increasing the temperature of solids , the kinetic energy of the particles increases. Due to the increase in kinetic energy , the particles start vibrating with greater speed. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

Boiling

As the kinetic energy increases, the molecular motion increases and the molecules of the liquid overcome the force of attraction between them. ... This produces a pressure above the liquid equal to the atmospheric pressure and the liquid starts boiling.

sublimation

✨Sublimation occurs as molecules of a substance in the solid state go to the vapor state directly, rather than through the liquid state. ... ⭕In terms of the kinetic molecular theory, we know that molecules are in constant random motion, even when the substance is below the melting point.

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Answer 2

Answer:

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