Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Ideal Gas Molecules
70 practice questions
Topics covered
Practice questions
21–30 of 70
Question 21
2 marks · Easy
Answer and see the solution →A gas in a sealed syringe has a pressure of 80 kPa and a volume of 25 cm³ at constant temperature. What will its pressure be if the volume is reduced to 20 cm³? Give your answer to 2 significant figures.
Question 22
1 mark · Easy
Answer and see the solution →Give the relationship between the average kinetic energy of gas molecules and the temperature of the gas.
Question 23
1 mark · Easy
Answer and see the solution →Name one way to change the pressure of a fixed mass of gas inside a sealed container (other than changing its volume).
Question 24
2 marks · Normal
Answer and see the solution →State Boyle's law in terms of the relationship between the pressure and volume of a fixed mass of gas at constant temperature.
Question 25
3 marks · Normal
Answer and see the solution →Explain, in terms of the particle model, why increasing the temperature of a gas at constant volume increases the pressure of the gas.
Question 26
3 marks · Normal
Answer and see the solution →A sealed syringe contains 40 cm³ of air at a pressure of 100 kPa. The syringe is slowly compressed to a volume of 16 cm³ at constant temperature. Calculate the final pressure inside the syringe.
Question 27
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 28
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 29
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 30
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.