Impact of Globalization on Urban Culture
THE INDIAN HIGH SCHOOL, DUBAI.
SUMMER ASSIGNMENT -2013 GRADE -9(Boys)
CHEMISTRY.
1. Evaporation of a liquid can take place
a)At its boiling point b) Below its boiling point c) At all temperatures d) At a fixed temperature
2.Evaporation of water will increase with
a) addition of a solute to it b) decrease in temperature c) increase in temperature d)less surface area
3.Diffusion is faster in the case of
a)Oxygen b) nitrogen c) hydrogen d) Carbon dioxide
4.During evaporation, particles of a liquid change to vapours only:
a)from the surface b) from the bulk c)from surface and bulk d) none of these
5.Differentiate between boiling and evaporation.
6.If external pressure decreases , what change will be seen in the boiling point of water?
7.List the various factors which affect the rate of evaporation of a liquid.
8.Give reasons:
a) Two solids kept together do not intermix but two miscible liquids or gases intermix fast.
b)Clothes dry faster on a dry windy day than on a humid day.
c) We sweat more on a humid day than s hot dry day.
d) We feel cold when a cologne is sprayed on our body.
e)We need to spread out the wet clothes for drying it.
f)We can sip hot tea faster from a saucer than a cup.
9.Under what conditions can hydrogen gas be liquefied?
10.Why do we see droplets of water on the outer surface of a glass containing cold water?
11.Define the terms: Diffusion, sublimation, latent heat of fusion, latent heat of vapourisation.
12.Name 3 substances that sublime.
13.Sponge is a compressible material, yet it is classified as a solid. Why?
14.What is the boiling and melting point of water in the Kelvin scale.
15.What can dry ice be converted to its gaseous form?
SUMMER ASSIGNMENT -2013 GRADE -9(Boys)
CHEMISTRY.
1. Evaporation of a liquid can take place
a)At its boiling point b) Below its boiling point c) At all temperatures d) At a fixed temperature
2.Evaporation of water will increase with
a) addition of a solute to it b) decrease in temperature c) increase in temperature d)less surface area
3.Diffusion is faster in the case of
a)Oxygen b) nitrogen c) hydrogen d) Carbon dioxide
4.During evaporation, particles of a liquid change to vapours only:
a)from the surface b) from the bulk c)from surface and bulk d) none of these
5.Differentiate between boiling and evaporation.
6.If external pressure decreases , what change will be seen in the boiling point of water?
7.List the various factors which affect the rate of evaporation of a liquid.
8.Give reasons:
a) Two solids kept together do not intermix but two miscible liquids or gases intermix fast.
b)Clothes dry faster on a dry windy day than on a humid day.
c) We sweat more on a humid day than s hot dry day.
d) We feel cold when a cologne is sprayed on our body.
e)We need to spread out the wet clothes for drying it.
f)We can sip hot tea faster from a saucer than a cup.
9.Under what conditions can hydrogen gas be liquefied?
10.Why do we see droplets of water on the outer surface of a glass containing cold water?
11.Define the terms: Diffusion, sublimation, latent heat of fusion, latent heat of vapourisation.
12.Name 3 substances that sublime.
13.Sponge is a compressible material, yet it is classified as a solid. Why?
14.What is the boiling and melting point of water in the Kelvin scale.
15.What can dry ice be converted to its gaseous form?