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CAIE A-Level Chemistry AS 4.1 Gases Ideal Real and Pv Nrt Questions

Practise ideal-gas calculations and explaining why real gases deviate when particle volume or intermolecular attraction matters.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use pV=nRT with pressure in Pa, volume in m3, temperature in K and R in matching units
  • rearrange before substitution and convert cm3 or dm3, kPa and °C correctly
  • explain high-pressure, low-temperature deviation through particle volume and intermolecular attraction

Covered syllabus points

4.1.1—Origin of pressure in a gas4.1.2—Ideal gases have zero particle volume and no4.1.3—Ideal gas equation pV = nRT

Question 1

[Maximum number: 1]

Which assumptions are made about ideal gases?

1 Ideal gases contain molecules with no mass.
2 Ideal gases contain molecules with no volume.
3 Ideal gases have no intermolecular forces.

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Question 2

[Maximum number: 1]

What is the density of a sample of fluorine gas at 32∘C32^{\circ} \mathrm{C} and 100000 Pa ? Assume fluorine behaves as an ideal gas under these conditions.

A

1.4gdm−31.4 \mathrm{gdm}^{-3}

B

1.5gdm−31.5 \mathrm{gdm}^{-3}

C

1.6 gdm−31.6 \mathrm{~g} \mathrm{dm}^{-3}

D

1.7gdm−31.7 \mathrm{gdm}^{-3}

Question 3

[Maximum number: 1]

Under which conditions will nitrogen behave most like an ideal gas?

temperature

pressure

low

high

high

low

low

low

high

high

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