CBSE 9 matter and its surroundings 003

1.      Arrange the following in the increasing order of the rigidity of the molecules-                        3

Ice, wood, jelly, cream, juice, snow, lotion, concrete

2.      Differentiate between the states of matter for the following reasons- diffusion, arrangement of particles, rigidity, intermolecular space.                                                                           4

3.      Give reason for the following-                                                                                     5

a.       Liquid flows easily?

b.      Steam produce severe burns than boiling water

c.       We can easily move our hand in liquid matter but not in solids

d.      Salt anmd sugar when placed in the jar take sthe hape of the jar but still considered as the solids

e.       After morning exercise you feel cold

4.      Define-                                                                                                                        5

a. latent heat of fusion

b. evaporation

c. boiling

d.latent heat of vapourisation

e. melting point

5. explain the process of conversion of water into solid liquid and gas with a schematic diagram    3