Physics 0625 · IGCSE · Kinetic particle model of matter
Kinetic particle model of matter — practice question
Within an industrial process, a gas already under high pressure is held inside a large cylinder by a piston. The piston is forced further into the cylinder. While the gas pressure changes, its temperature stays constant.
(a(i))[3]
Describe the pattern shown by the graph for the gas pressure and the volume it occupies. Explain this pattern in terms of the molecules.
(a(ii))[2]
Work out the volume occupied by the gas when it is released into the atmosphere at a pressure of 0.10 MPa. You will need to take data from Fig. 4.2.
(b(i))[1]
State how the fall in temperature changes the motion of the gas molecules.
(b(ii))[1]
State how the fall in temperature changes the pressure of the gas in the cylinder.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Inverse proportion or pV = constant or p ∝ 1/V” …