Answers to AQA GCSE Gas Pressure and Volume
Practice Questions
1. Explain how gas pressure is caused.
Gas particles are moving in random directions and collide with the walls of the container, exerting a net force at 90 degrees to the wall of the container. This force is the gas pressure.
2. State the relationship between gas pressure and gas volume
As gas volume increases, gas pressure decreases. So, it is an inversely proportional relationship.
3. Describe the appearance of a graph that has gas pressure on the Y axis and 1/volume on the X axis
As this is 1/volume, the graph will be linear, straight line with a positive gradient.
4. Gas Y is compressed down to a volume of 20m3 with a gas pressure of 50Pa. The original gas has a pressure of 15Pa. Calculate the original gas volume before compression.
P1 = 15Pa (original pressure)
V1 = ?
P2 = 50 Pa (new pressure)
V2 = 20m3 (new volume)
P1 x V1 = P2 x V2
V1 = (P2 x V2)/P1
V1 = (50 x 20)/15
V1 = 66.7m3
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