CLASS-9
CHEMISTRY WORKSHEET
CHEMISTRY WORKSHEET
1.
The rate of evaporation
decreases with 1M
a. (a) increase in humidity (b) increase of temperature
b. (c) increase in wind speed (d)
increase of surface area
2.
Arrange the following
substances in increasing order of force of attraction between the particles.
a. (i) milk (ii) salt (iii) oxygen
1M
(a)
Conversion of solid into
vapours without passing through the liquid state is called vaporization.
(b)
Conversion of vapours into
solid without passing through the liquid state is called sublimation.
(c)
Conversion of vapours into
solid without passing through the liquid state is called freezing.
(d)
Conversion of solid into liquid
is called sublimation. 1M
4.
What is the value of boiling
point of water on Kelvin scale of temperature? 1M
5.
On converting 25°C, 38°C and
66°C to kelvin scale, the correct sequence of temperature will be:
a. 298 K, 311 K and 339 K
b. 298 K, 300 K and 338 K
c. 273 K, 278 K and 543 K
d. 298 K, 310 K and 338 K
1M
6.
Convert:
(a) 27°C into kelvin scale (b) 500 K into Celsius scale 2M
7.
What is dry ice? Dry ice is compressed at high
pressure. What happens when pressure is released?
2M
8.
Answer the following questions:
(a)
Why is ice at 273 K more effective
in cooling than water at the same temperature?
(b)
Name the two gases which are supplied in
compressed form in homes and hospitals.
2M
9.
When a bottle of scent is opened in one corner
of a room, it immediately spreads throughout the room. What property of matter
is responsible for this observation? Explain 3M
10.
Define (i) Latent heat of fusion and
(ii) Latent heat of vaporization.
(iii) Give
suitable examples for (i) & (ii)
3M
11.
What is Evaporation? Explain
how the following factors affect the rate of evaporation of a liquid:
I.
Temperature of the liquid. 3M
II.
Area of the exposed surface.
III.
Moisture in the surrounding
air.
IV.
Increase in wind speed.
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