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CBSE--Class9--Chemistry-2013-->View question

Give reasons: CBSE- Class9- Chemistry 2013

(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.


Asked On2017-07-24 04:39:16 by:Fututron

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(a)    A gas completely fills the vessel in which it is kept because there is negligible force of attraction between the particles of gas. Thus, the gas particles move freely in all directions.
 
(b)    A gas exerts pressure on the walls of the container because the 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. 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 because it has a definite shape and volume. It is very rigid and cannot be compressed i.e., it has the characteristics of 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 because the particles of air have large intermolecular spaces and least force of attraction between them. Thus, one can easily move the hand in air and push the particles of air apart. However, the particles of solid have 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.
 
Concept insight: For answering reasoning questions, the complete reason should be mentioned. For answering this question, you need to remember all the properties of solids, liquids and gases.

Answerd on:2017-07-25 Answerd By:13priya

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