Question

4. 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:

1. because the molecular attraction of gases is very weak that is why the atoms of gas spread to all the direction..

2. as the atoms are constantly in motion according to the kinetic molecular theory so they collide with the walls of the container thus exerting pressure...

3. as because the molecular attraction of wood is very strong moreover the object is solid because it's having a compact shape and it cannot flow and has a definite mass...

4. the reason is the molecular attraction of the air is weak whereas the same of the block of wood is strong so when we wave our hand in air the molecules of air moves whereqs the same of block of wood doesn't .......

Explanation:

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Answer 2

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a) Kinetic energy possessed by gas particles is very high which allows them to randomly move across all directions when contained, hence the particles fills the gas vessel entirely.

b) Gas molecules possess high kinetic energy, due to which they are under constant motion inside the container in random directions which causes them to hit the walls of the container and hence create vibrations. These collisions with the walls of the container generate pressure.

c) A wooden table should be called a solid as it possesses all the properties of a solid such as:

◆ Definite size and shape

◆ Intermolecular attraction between closely packed particles.

◆ It is rigid and cannot be compressed

d) Molecules in gases are loosely packed as compared to solid molecules which are densely packed.

Hence we are easily able to break the force of attraction when we move our hand through air but find it difficult to break through a solid (because of greater forces of attraction between molecules) which a karate expert is able to smash with the application of a lot of force.

Thanks !!