Question

class 9 chemistry worksheet

1. Give reasons for the following:
(i) The smell of the cooked food reaches our nostrils even without our entering the kitchen.
(ii) Liquids are more compressible than solids.
(iii) Sponge is a solid yet it can be compressed.
(iv) A wooden almirah is considered to be a solid.
(v) Rubber band is a solid yet it changes its shape.
(vi) Gases exert pressure on the walls of container
(vii) Rate of diffusion is more in liquids than in solids
(viii) Gases completely fill the vessel in which they are kept.
(ix) Liquid generally have lower density as compared to solids, but ice floats on water.
(x) We can get the smell of perfume sitting several meters away.
2. Identify the name of the material which has no fixed shape but has fixed volume.
Wood, a piece of iron, oxygen , water
3. Arrange the three states of matter in increasing order of
(i) Rate of diffusion
(ii) Intermolecular force of attraction
4. Water is liquid at room temperature. Justify the statement.
5. Name two processes which provide the best evidence for the motion of particles of matter.

Answer 1

Explanation:

{ 1}The smell of the coocked food reached to our nostril without our entering the kitchen because when food is coocked the air presend around coocked food also get warmed ans we know that air ia a type of medium the the smell of coocked food mixed with warm air and it dispersed one place to another compare to cold food .