Question

Give the reason
(A) the gas fills completely the vessel in which it is kept.
(B) a gas exert pressure on the walls on 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

a) There is little attraction between particles of gas . Thus , gas particles move freely in all directions . therefore , gas completely fills the vessel in which it is kept b)  Particles of gas move randomly in all directions at high speed .As a result .the particles hit each other and also hit the walls of the container with a force . therefore ,gas exerts pressure on the walls of the container .
c) A wooden table has a definite shape and volume . It is very rigid and cannot be compressed i.e . it has the characteristics of a solid .hence a wooden table should be called a solid .
d) Particles of air have large space between them on the other hand , wood has little space between its particles .Also ,it is rigid . for this reason . we can easily move our hands in air , but to do the same through a solid block of wood ,we need karate expert .
 

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 !!