Question

3. Give reasons
(a) A gas fills completely the
vessel in which it is kept.
(b) A gas exerts pressure on the
walls of the container.
(c) A wooden table should be
called a solid.
(d) We can easily move our hand
in air but to do the same
through a solid block of wood
we need a karate expert.​

Answer 1

Answer:

Gini Uni

Explanation:

A) Gases have a negligible intermolecular force of attraction between the particles of gas. The random motion of particles in all the directions is experience in the vessel. Hence, the gas fills completely the vessel in which it is kept.

B) 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.

C) A wooden table should be called a solid because it has a definite shape, fixed volume and a definite boundaries. Also, it cannot flow and incompressible.

D )We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and

Answer 2

Answer:

(a) A gas fills completely the vessel in which it is kept:

A gas completely fills the vessel in which it is kept.

A gas completely fills the vessel in which it is kept.Reason:

A gas completely fills the vessel in which it is kept.Reason:Gases have a negligible intermolecular force of attraction between the particles of gas. The random motion of particles in all the directions is experience in the vessel. Hence, the gas fills completely the vessel in which it is kept.

(b) A gas exerts pressure on the walls of the container.

A gas exerts pressure on the walls of the container

Reason:

They have high kinetic energy and negligible force of attraction so it can move constantly moving with high speed in all directions.Due to this intense random motion of particles, the particles hit each other and also hit the walls of the container with a force. These collisions of the gas particles with the walls of the container exert pressure on the walls of the container.

(c) A wooden table should be called a solid:

A wooden table should be called a solid

A wooden table should be called a solidReason:

• A wooden table should be called a solidReason:It has a definite shape and volume.
• A wooden table should be called a solidReason:It has a definite shape and volume.It is very rigid and cannot be compressed i.e., it has the characteristics of a solid.
• A wooden table should be called a solidReason:It has a definite shape and volume.It is very rigid and cannot be compressed i.e., it has the characteristics of a solid.There is a strong force of attraction between molecules of wood and intermolecular space is the least.
• A wooden table should be called a solidReason:It has a definite shape and volume.It is very rigid and cannot be compressed i.e., it has the characteristics of a solid.There is a strong force of attraction between molecules of wood and intermolecular space is the least.The table does not flow when placed.

As the wooden table acquires all the characteristics of a solid (that is fixed shape, volume, rigidity, strong force of attraction, least intermolecular space) hence the wooden table should be called solid.

(d) We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expertwood:

We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert.

We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert.Reason:

• We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert.Reason:Molecules in gases are loosely packed as compared to solid molecules which are densely packed. So we can easily break the force of attraction when we move our hand through the air but it is difficult to break through a solid due to the greater forces of attraction between molecules.
• We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert.Reason:Molecules in gases are loosely packed as compared to solid molecules which are densely packed. So we can easily break the force of attraction when we move our hand through the air but it is difficult to break through a solid due to the greater forces of attraction between molecules.The particles of the air have large intermolecular spaces and least force of attraction between them. The particles of solid have a minimum amount of intermolecular space and maximum force of attraction between them. Thus, a greater amount of force is required to move the particles of solid apart. Thus, a much greater force is required to move hand through a solid block of wood.

So we need a karate expert to break the solid block of wood.