Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Ideal Gas Molecules
70 practice questions
Topics covered
Practice questions
21–30 of 35 · Normal
Question 21
4 marks · Normal
Answer and see the solution →A student fills a flexible balloon with air and seals it. The pressure inside the balloon is kPa at C. The balloon is then placed in an oven at C and the pressure reaches kPa.
(a)[1 mark]Convert all temperatures to Kelvin.
(b)[3 marks]Use the gas law to calculate the new volume of the balloon if the initial volume was L.
Question 22
3 marks · Normal
Answer and see the solution →Describe how you could investigate the relationship between the pressure and volume of a trapped gas in a school laboratory, stating the measurements you would take to confirm Boyle's law.
Question 23
3 marks · Normal
Answer and see the solution →A car tyre contains air at a pressure of 230 kPa at 15°C. After a drive, its temperature rises to 40°C. Assume the volume stays constant.
Calculate the final pressure in the tyre. Give your answer to 2 significant figures.
Question 24
4 marks · Normal
Answer and see the solution →The diagram shows a pressure gauge connected to a sealed rigid container filled with air. The container is placed in a cold room and the temperature is monitored.
(a)[1 mark]State what is meant by absolute zero.
(b)[1 mark]The initial temperature of the air is 15 °C. Calculate the temperature in Kelvin.
(c)[1 mark]If the temperature falls to -40 °C, calculate the new temperature in Kelvin.
(d)[1 mark]Explain why the pressure in the container decreases as the temperature falls, referencing ideas about energy of gas particles.
Question 25
3 marks · Normal
Answer and see the solution →A sample of gas is heated from -15 °C to 65 °C at constant volume. The initial pressure is 80 kPa.
Calculate the final pressure of the gas in kPa. Show all your steps and give your answer to 2 significant figures.
Question 26
1 mark · Normal
Answer and see the solution →Room temperature is 25 °C. What is this temperature in kelvin?
Question 27
2 marks · Normal
Answer and see the solution →Explain what happens to the kinetic energy of particles as a substance approaches absolute zero.
Question 28
1 mark · Normal
Answer and check →Which temperature is closest to absolute zero?
- A.0 °C
- B.-273 °C
- C.273 K
- D.100 K
Question 29
3 marks · Normal
Answer and see the solution →A physics classroom is at 18 °C. A scientist is cooling a gas sample to investigate pressure at lower temperatures.
(a)[1 mark]Convert the classroom temperature to kelvin.
(b)[1 mark]The gas is cooled to 5 °C. What is this temperature in kelvin?
(c)[1 mark]If the gas were cooled to 0 K, what would happen to the motion of the particles? Explain.
Question 30
2 marks · Normal
Answer and see the solution →Why must you convert temperatures to kelvin before using gas law equations?