Q31 of 160 Page 19

Give one example of the diffusion of a solid in another solid.

Some time we observe that the marks of chalk on the black board could not be wiped out easily after a long time. This happens because of the diffusion of particles of chalks with the particles of black-board and marks of chalk could not be wiped out.


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29

Describe in your own words, what happens to the particles when salt dissolves in water.

 30

Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

 32

Explain why, the diffusion of a solid in another solid.

 33

Whish of the following diffuses fastest and which the slowest?

Solid, Liquid, Gas


Give reasons for your answer.