Question

a) compare the following properties of a substance which exist, in liquid state, gaseous state.
1) the energy
2) attractive force between molecules
3) freedom of movement of molecules

b) even though gas molecules are continuously collision with each other there is no loss of energy. why? ​

Answer 1

The energy and freedom of movement of molecules are more in the gaseous state, the attractive force between molecules in the liquid state is more and there is no loss of energy when gas molecules collide because the collision is elastic.

Explanation:

a)

1)

• According to the kinetic molecular theory of matter, energy depends on the temperature of the state of matter.
• For example, water exists in the liquid as well as vapour phase when we boil it. Since the temperature of vapour phase will be more, therefore the gaseous state will have higher energy.

2)

• Considering the example of water again, in the liquid state the attractive force between molecules is more than in the gaseous state.
• This is because the kinetic energy of thegaseous state is more as the gaseous molecules are in constant random motion.

3)

• In the gaseous state, the molecules are far away from each other as compared to the liquid state.
• Therefore, the freedom of movement of molecules is more in the gaseous state

b)

• The collision between two gas molecules is elastic in nature.
• Hence, the kinetic energy remains conserved.
• Therefore, there is no loss of energy even though gaseous molecules continuously collide with each other.