1) DEFINE:
A) matter
B) element
C) atom
D) molecule
E) latent heat of fusion.
F) latent heat of vaporization.
G) diffusion
2) write the fundamental postulate of kinetic theory of matter.
3) On what factors the rate of diffusion of a gas depends.
4) Name two everyday phenomena which suggest that matter is made up of molecules.
5) State for assumption of kinetic theory of matter.
6) a) what do you understand by the term Brownian movement ?
b) Explain Brownian movement on the basis of kinetic model of matter.
7) Water from a clear stream was collected in a glass. The glass was covered with a dish and water was observed against powerful light. It was observed that water contained tiny suspended particles of send.
a) describe the motion of particles carefully.
b) what is the cause of the above movement?
c) what name will you assign to the above movement of particles?
d) Will this movement occur, if the particle size is bigger?
e) will the above movement increase or decrease, if water is warmed ?
f) Give one reason for the answer in (e) ?
8) On the basis of kinetic model of matter, explain the physical difference between solids, liquids and gases.
9) On the basis of kinetic model of matter, explain:
a) solids expand on heating.
b) liquids expand more on heating as compared to solids.
c) Gases expand more than solids and liquids of heating.
10)a) What do you understand by the term diffusion ?
b) Describe a simple experiment to show the diffusion in liquids.
11) Explain on the basis of molecular (kinetic theory) of matter:
a) Diffusion of a solid in a liquid
b) Diffusion of a solid in a gas.
c) Diffusion of a liquid in a gas.
d) Diffusion of one gas into another gas.
12) A crystal of Potassium dichromate (Orange Red in colour) is placed in a beaker of water which is covered by a glass lid.
a) what is your observation after 10 minutes ?
b) What is your observation after 2 days ?
c) Explain the phenomenon on the basis of kinetic theory of matter.
13) a) Why cannot the solids diffuse in solids ?
b) Give two examples of diffusion of solids in gases.
14) On the basis of kinetic model of matter, define.
A) Heat
b) Temperature
15) Explain on the basis of kinetic of matter.
a) Solids change into liquid state on heating.
b) The temperature of solid stops rising, once the melting starts.
c) liquid change into gaseous state on heating.
d) The temperature of boiling liquid stops increasing during the Vaporization.
16) On the basis of kinetic model of matter, explain
a) why boiling point of water rises with the increasing pressure.
b) boiling point of water falls with pressure on the fall in pressure.
17) On the basis of kinetic model of matter, explain:
a) evaporation
b) cooling is caused by evaporation.
18) On the basis of kinetic model of matter, explain:
a) Moving air increases the rate of evaporation.
b) A piece of iron gets hot when rubbed over stone.
c) The rate of evaporation increases with increase in exposed area of liquid.
d) Rate of evaporation increases with the rise in temperature of its surroundings.
19) a) What is the effect on temperature on adding common salt to ice ?
b) Give an explanation for your answer (a).
20)a) What do you understand by the term freezing mixture ?
b) State two uses of freezing mixture ?
21) a) What is the effect of increase in pressure on the boiling point of a liquid.
b) state one use of above effect in day to day life.
c) What is the effect of dissolved impurities on the boiling point of water ?
22) a) Why do not pulses and meat cook well on mountains?
b) suggest and explain a method for cooking pulses or meat on the hilly easily.
c) Why food cooks faster in pressure cooker as compared to ordinary cooking vessels?
23) Give four difference between boiling and evaporation.
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