plumiIdeal gases: Edexcel A‑Level Physics questions
Every Edexcel A-Level Physics exam question on Ideal gases (specification points 149–152), 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q17(a)
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Q17(b)(i)
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Q17(b)(ii)
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Q17(b)(iii)
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Q4(a)
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Q14(b)(i)
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Q14(b)(ii)
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Q19(a)
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Q12(b)
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Q18(a)
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Q18(b)
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Q18(c)
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Q18(d)
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Q18(c)(i)
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Q18(c)(ii)
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Q18(b)(ii)
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Q18(b)(iii)
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All 30 questions on Ideal gases, as a list
- June 2025, Paper 2, Q14 (6 marks): * 14 Air molecules are trapped in a container by a piston, as shown. piston The position of the piston is adjusted so that the volume available to the air molec
- June 2025, Paper 3, Q6 (6 marks): *6 Air at room temperature was sealed in a closed container. The container was placed in an ice bath and the temperature of the air decreased. The volume of the
- June 2024, Paper 2, Q17(a) (6 marks): A hot air balloon consists of a fabric envelope, heaters and a basket, as shown. envelope heaters basket When the balloon is set up, the envelope is partly fill
- June 2024, Paper 2, Q17(b)(i) (1 mark): State one assumption of the kinetic theory of gases. (1)
- June 2024, Paper 2, Q17(b)(ii) (2 marks): Derive an equation to show that, for a gas at temperature T, the mean kinetic energy of the molecules = 3 2 kT (2)
- June 2024, Paper 2, Q17(b)(iii) (3 marks): Calculate the root-mean-square speed of nitrogen molecules at a temperature of 120°C. mass of nitrogen molecule = 28 u (3) Root-mean-square speed =
- June 2024, Paper 3, Q4(a) (5 marks): A full canister contains helium gas at a temperature of 18.5°C and a pressure of 1.65 × 107 Pa. The canister is approximately spherical, with a radius of 4.36 ×
- June 2023, Paper 2, Q14(b)(i) (4 marks): The canister is in the shape of a cylinder of length 0.23 m and radius 0.11 m. Calculate the number of molecules of butane gas in the canister. Assume the volum
- June 2023, Paper 2, Q14(b)(ii) (2 marks): Calculate the r.m.s. speed of the molecules of butane gas. –26 kg mass of butane molecule = 9.6 × 10 (2) r.m.s. speed =
- June 2022, Paper 2, Q7 (1 mark): Air is trapped in a glass tube. When the air is forced into a smaller volume at a constant temperature, the pressure increases. Which of the following statement
- June 2022, Paper 2, Q19(a) (4 marks): The neon gas is at a pressure of 1.25 Pa and a temperature of 25 °C. Calculate the number N of neon atoms inside the bulb. bulb diameter = 16.0 cm (4) N =
- June 2022, Paper 3, Q12(b) (6 marks): The most common radionuclide amongst the fission products in the fuel was iodine-131, which decays with a half-life of 8.0 days to form a stable isotope of the
- November 2021, Paper 2, Q18(a) (3 marks): Show that the pressure of the air in the cylinder must be about 2 × 105 Pa in order to push the cork out. maximum frictional force = 8.8 N cross-sectional area
- November 2021, Paper 2, Q18(b) (2 marks): Calculate the temperature of the gas in the cylinder at the instant the cork is expelled. volume of air in the cylinder with the handle pulled out = 1.1 × 10−5
- November 2021, Paper 2, Q18(c) (2 marks): The formulae sheet for this paper includes the equation pV = 1 3 Nm〈c2〉 Derive the equation 1 2 m〈c2〉 = 3 2 kT (2)
- November 2021, Paper 2, Q18(d) (2 marks): Calculate the root mean square speed of the molecules of air in the cylinder before the handle is pushed in. average mass of molecule of air = 4.8 × 10−26 kg te
- October 2020, Paper 2, Q18(c)(i) (3 marks): Calculate the pressure due to the deuterium ions. mass of deuterium ion = 3.3 × 10−27 kg (3) Pressure =
- October 2020, Paper 2, Q18(c)(ii) (2 marks): Calculate the root mean square speed of the deuterium ions at this temperature. (2) Root mean square speed =
- June 2019, Paper 2, Q18(b)(ii) (4 marks): Determine the volume of helium gas that could be collected in a year as a result of alpha emission. Assume that the temperature is 22.0°C and the pressure is 1.
- June 2019, Paper 2, Q18(b)(iii) (3 marks): Calculate the root mean square speed of the atoms in the helium gas at a temperature of 22.0°C. (3) Root mean square speed =
- June 2019, Paper 3, Q11(a)(i) (3 marks): Criticise the student’s results. (3)
- June 2019, Paper 3, Q11(a)(ii) (4 marks): Explain two possible sources of error in this investigation. (4)
- June 2019, Paper 3, Q11(a)(iii) (2 marks): Describe two improvements that would increase the accuracy of measurements obtained in this investigation. (2)
- June 2019, Paper 3, Q11(b)(ii) (4 marks): The student wrote a report of the investigation in her lab book. In the conclusion she wrote: “In this investigation uncertainties were minimised by selecting m
- June 2018, Paper 2, Q2 (1 mark): A sample of an ideal gas has pressure p, volume V and absolute temperature T. The volume of the gas is decreased to 2 3 V and the temperature increased to 6 5 T
- June 2018, Paper 2, Q11(a) (2 marks): For an ideal gas pV = NkT and pV = 1 3 Nm c2 . Use these relationships to show that the mean kinetic energy of a gas molecule is proportional to the absolute te
- June 2018, Paper 2, Q11(b) (3 marks): The molecules in a sample of gas have a mass of 5.0 × 10í kg. Calculate the root-mean-square speed of gas molecules in the gas at 25°C. (3) Root-mean-square s
- June 2018, Paper 3, Q12(a) (6 marks): The model of atoms as hard incompressible spheres, moving rapidly and randomly, can be used to explain why gases exert a pressure. Explain, using ideas of momen
- June 2017, Paper 2, Q16(c) (2 marks): The pressure of the air in the empty pipette in part (a) was 1.01 × 105 Pa. Calculate the pressure of the air in part (b). (2) Pressure =
- June 2017, Paper 3, Q12(c)(i) (2 marks): Calculate the mean kinetic energy of an atom in the photosphere at a temperature of 3100 K. (2) Mean kinetic energy =
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