2. Why do solids have high density?
3. Why do gases exert pressure?
4. What happens when liquid is supplied with heat?
5. Why is diffusion of gases fastest?
Answers
Answer:
1. The solids have high densities because they have strong intermolecular bond. The density of any object is a physical property that depends on mass and volume. In solid state, the solid particles are very close to each other due to strong intermolecular force of attraction between them.
2. The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exerts pressure on the gas.
3. When heat is supplied to a liquid, it is absorbed by the molecules in that liquid to overcome the force of attraction between them and change into gaseous state. The heat is absorbed in the form of latent heat of vaporisation. That heat is utilised to change the liquid into vapour.
4. Gaseous particles tend to undergo diffusion because they have kinetic energy. Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy. Graham's Law states that the effusion rate of a gas is inversely proportional to the square root of the mass of its particles.
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Answer:
2. Because they have a strong molecular bond.
3. The pressure exert by a gas due to the random motion of particles in the gas.
4. When liquid is supplied with heat bt the molecules in that liquid to overcome the force of attraction between them and change in gaseous state.
5. Gasses particles tend to undergo diffusion by they have kinetic energy.