Question

use the kinetic molecular theory ( matter = particles ) to explain the differences between solid vs liquid vs gas phase. And describe how particles are behaving during a phase change

Answer 1

• In kinetic molecular theory, it is considered that all the particles are in random motion and are having energy and there is a variation in this energy depending of its temperature.
• The measure of average kinetic energy is termed as the temperature of the particles.
• Solid phase has the least amount of energy and the amount of empty space in between the paticles is less.
• Liquid phase has larger amount of energy when compared to its solid phase.The amount of empty space between molecules is also higher than the solid.
• Gaseous phase has the largest amount of energy of all phases and the empty space between particles is d highest of all phases.

# To understand the behaviour of the particles in different phases,we must keep in mind that the kinetic energy increases with increase in temperature.

# The energy and the temperature present in the phase is in the following order:

Solid < liquid < Gas

Phase change	Change in energy and temperature of particles	Phenomenon of the system
Solid-liquid	Increases	Melting
Liquid-Gas	Increases	Evaporation
Gas-solid	Decreases	Re-sublimation
Solid-Gas	Increases	Sublimation
Gas-Liquid	Decreases	Condensation
Liquid-Solid	Decreases	Freezing