37. Explain the following according to the kinetic
molecular theory.
(a) melting
(b) boiling
(c) condensation
(d) freezing
Answers
Answer:
a) Boiling:
On heating liquids, the temperature rises.
Particles gain energy.
The intermolecular force of attraction decreases.
Intermolecular space between the molecules of liquid increases.
At boiling point, particles become completely free and convert into a gas/vapour.
b) Melting:
On heating solids, the temperature rises.
Particles gain energy.
The intermolecular force of attraction decreases.
Intermolecular space between the molecules of solid increases.
At melting point, particles of solid become free from a fixed position and get converted into a liquid
c) Condensation:
Condensation is the change of the physical state of matter from the gas phase into a liquid phase and is the reverse of vaporisation.
d) Freezing
Freezing point is the temperature at which a liquid changes its phase to become a solid. The process is called freezing. The kinetic theory of matter says that all matter is composed of particles which have a certain amount of energy which allows them to move at different speeds depending on the temperature (energy).
Explanation:
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