Advertisements
Advertisements
Question
Give reasons:
We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.
Advertisements
Solution
- 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.
- It is because the molecules of air have less force of attraction between them, and a very small external force can separate them and pass through them.
- However, in solids, the molecules have the maximum force of attraction, and the particles are tightly bound due to this force. Hence, a large amount of external force is required to pass through the solid.
APPEARS IN
RELATED QUESTIONS
Give reasons:
A gas exerts pressure on the walls of the container.
Give a reason for the following observation.
We can get the smell of perfume sitting several metres away.
Which of the following diffuses fastest and which the slowest?
Solid, Liquid, Gas Give reasons for your answer.
The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.
- Name the substances (i) X (ii) Y and (iii) Z.
- What is the process of conversion of X into Y known as ?
- At which temperature X gets converted into Y ?
- What is the process of conversion of X into Z known as ?
- At which temperature X gets converted into Z ?
Why do gases not have fixed shape?
How does the substance of gaseous particles change to a liquid state?
Comment upon the following:-
compressibility
Comment upon the following:-
fluidity
Comment upon the following:-
filling a gas container
Comment upon the following:-
density
