Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Ideal Gas Molecules
70 practice questions
Topics covered
Practice questions
11–20 of 35 · Normal
Question 11
4 marks · Normal
Answer and see the solution →A student investigates Boyle's law using a sealed syringe containing air. She changes the volume and measures the pressure at constant temperature.
(a)[1 mark]Describe one step the student should take to make sure the temperature of the gas stays constant during the experiment.
(b)[2 marks]The student records the following results:
Volume (cm³) Pressure (kPa) 50 80 40 100 32 125 Show that the product of pressure and volume is roughly constant for these readings.
(c)[1 mark]Suggest why the results might not be perfectly constant.
Question 12
2 marks · Normal
Answer and see the solution →The graph below shows the relationship between the pressure and volume of a fixed mass of gas at constant temperature.
Pressure-volume graph for a fixed mass of gas at constant temperature. Describe the relationship shown by the graph and explain why this relationship occurs using Boyle's law.
Question 13
2 marks · Normal
Answer and see the solution →A bicycle pump gets warm after inflating a tyre quickly. Using the particle model, explain briefly why this happens.
Question 14
1 mark · Normal
Answer and check →Which option best describes the change in particle movement when a gas is heated at constant volume?
- A.Particles move slower and pressure decreases.
- B.Particles move faster and pressure increases.
- C.Particles move at the same speed but pressure increases.
- D.Particles move at the same speed and pressure stays the same.
Question 15
4 marks · Normal
Answer and see the solution →Figure 1 shows a diagram of an air-filled syringe with its tip sealed. The plunger is pressed in to reduce the volume, while the temperature is kept constant.
An air-filled sealed syringe. (a)[2 marks]Explain what happens to the pressure inside the syringe as the plunger is pushed in (the volume decreases and temperature stays the same).
(b)[2 marks]Describe the motion of the air particles inside the syringe as the plunger is pressed in at constant temperature.
Question 16
3 marks · Normal
Answer and see the solution →A sample of gas is in a cylinder at a pressure of atm and a volume of dm. The gas is compressed to a volume of dm at constant temperature.
Calculate the new pressure of the gas.
Question 17
2 marks · Normal
Answer and see the solution →Explain, with reference to particle motion, why increasing the temperature of a gas at constant volume increases the gas pressure.
Question 18
3 marks · Normal
Answer and see the solution →A fixed mass of gas has pressure Pa at K. The temperature is raised to K and the volume remains constant.
Calculate the new pressure of the gas.
Question 19
4 marks · Normal
Answer and see the solution →A student investigates Boyle's law using a sealed syringe, as shown.
The initial pressure is kPa and the initial volume is cm. By pushing the plunger, the volume is changed to cm while temperature remains constant.
(a)[1 mark]State Boyle's law.
(b)[3 marks]Calculate the final pressure inside the syringe.
Question 20
1 mark · Normal
Answer and check →When a gas is heated at constant pressure, which of the following will increase?
- A.Its density
- B.Its volume
- C.Its mass
- D.Its pressure