An experiment is set up to investigate how the pressure of a fixed mass of air at room temperature changes with volume. Fig. 3.1 shows the apparatus in use. The syringe is closed at one end, and the piston can move up and down while different metal weights are added.
(a)[1]
State the unit used to measure pressure.
(b(i))[1]
Fig. 3.2 shows the axes for a graph of pressure against volume for the air in the syringe. A point is already marked at pressure $P_0$ and volume $V_0$. On Fig. 3.2, add points for volumes of $0.5V_0$ and $2.0V_0$.
(b(ii))[1]
Complete the graph.
(c)[3]
Extra metal weights are added on top of the syringe. Explain how the air molecules inside the syringe can support more metal weights.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Pa, N m^{-2}, cm of mercury, or atmosphere(s)” …