Question

give reasons
(a) a gas filled completely the vessel 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 easily move our hand in air but to do same through a solid block of wood we need a karate expert.​

Answer 1

a) Molecules of gas moves constantly and spread.

b) As the gas is pressurized in the vessel, it exerts pressure on walls of container to come out.

c) It should be called a solid because the particles of a solid are closed and have least space between them.

d) In air, the particles have spaces between them but solid objects have least space between their particles.

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 !!