Q34 of 160 Page 19

Explain the following:

When an incense stick is lighted in the corner of room, its fragrance spreads quickly in the entire room.

When an incense stick is burnt, the incense present in it vaporizes because of heat. The vapours move rapidly in all directions due to the diffusion. The vapour mixes with air and reaches to us. In similar way we sense the good or bad smell from a distance.

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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.

 35

Name the three states of matter. Give one example of each.

 36

State two characteristic properties each of:

(a) A solid


(b) a liquid


(c) a gas