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Form 3 Physics Topical Questions and Answers on Gas Laws
What the value of #-20^0C# on the absolute temperature scale?
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Answer Text:
= #-20^0C +273 =253K#
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1.
A house in which a cylinder containing cooking gas is kept unfortunately catches fire. The cylinder explodes. Give an explanation for the explosion.
2.
What the value of #-20^0C# on the absolute temperature scale?
3.
Determine the pressure required to compress a gas in a cylinder initially at #20^0C# and at a pressure of #1.03 times 10^-5# pa to one-eighth of its original volume.
4.
A balloon is filled with air to volume of 200ml at a temperature of 293K.Determine the volume when the temperature rises to 353K at the same pressure.
5.
When an inflated balloon is placed in a refrigerator it is noted that its volume reduces. Use the kinetic theory of gases to explain this observation.
6.
State the pressure law of an ideal gas.
7.
Sketch a P-V graph for a gas obeying Boyle’s law.
8.
Sketch a graph of pressure against the reciprocal of volume for a gas obeying Boyle’s law.
9.
State what is meant by an ideal gas.
10.
State one assumption for the experiment carried out to verify the gas laws.
11.
The pressure of the air inside a car tyre increases if the car stands for some time on a hot day. Explain the pressure increase in terms of the kinetic theory of gases.
12.
A horizontal capillary tube of uniform bore sealed at one end contains dry air trapped by a drop of mercury. The length of the air column is 142mm at #17^0C#.Determine the length of the air column at #25^0C#
13.
State the law that relates the volume of a gas to its temperature.
14.
Two identical containers A and B are placed on a bench. Container A is filled with oxygen and container B with hydrogen gas such that the two gases have equal mass. If the containers are maintained at the same temperature state with reason the container in which the pressure is higher.
15.
State what is meant by absolute zero temperature.
16.
A glass capillary contains enclosed air by a thread of mercury 15cm long when the tube is placed horizontally as shown. i).What is the length of the enclosed air column when tube is vertical with the open end uppermost if the atmospheric pressure is 750mmHg? ii) Explain why an air bubble increase in volume
17.
The pressure acting on a gas in a container was changed steadily while the temperature of the gas was maintained constant. The value of volume (v) of gas was measured for various value of pressure (p). The graph in the figure below shows the relationship between the pressure (p) and the reciprocal of volume (v).
18.
A gas occupies a volume of 4000 litres at a temperature of #37^0 C# and normal atmospheric pressure. Determine the new volume of the gas if it is heated at a constant pressure to a temperature of #67^0C#. (Normal atmospheric pressure = #1.01 times 10^5# pa)
19.
State two quantities that must be kept constant to verify Boyle’s law.
20.
The volume of a fixed mass of a gas is reduced from #500cm^3# to #300cm^3# at a constant pressure. The initial temperature was 90K.Determine the final temperature.
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