Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-IG2-0012 marksL1 FoundationCalculatorMolecular kinetic energy

Calculate the mean translational kinetic energy of a gas molecule at

300

K, in units of

10^{-21}

J. (

k=1.38\times10^{-23}

J K⁻¹)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0031 markL1 FoundationCalculatorKinetic model

Which is not an assumption of the kinetic theory of gases?

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0041 markL1 FoundationCalculatorMolecular kinetic energy

The thermodynamic temperature of a gas is doubled. State the factor by which the r.m.s. speed increases.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0061 markL1 FoundationCalculatorMolecular kinetic energy

Helium and argon are at the same temperature. Their molecules have

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0081 markL1 FoundationCalculatorKinetic model

Gas pressure on a container wall is caused by

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0121 markL1 FoundationCalculatorMolecular kinetic energy

The mean translational kinetic energy of an ideal gas molecule is proportional to

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0022 marksL2 StandardCalculatorMolecular kinetic energy

An oxygen molecule has mass

5.3\times10^{-26}

kg. Calculate its r.m.s. speed at

300

K. (

k=1.38\times10^{-23}

J K⁻¹)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0051 markL2 StandardCalculatorKinetic model

Calculate the r.m.s. value of the speeds

200

400

and

600

m s⁻¹.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0072 marksL2 StandardCalculatorKinetic model

A gas has density

1.2

kg m⁻³ at a pressure of

1.0\times10^5

Pa. Calculate the r.m.s. speed of its molecules.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0091 markL2 StandardCalculatorMolecular kinetic energy

Calculate the temperature at which the mean kinetic energy of a gas molecule is

1.0\times10^{-20}

J. (

k=1.38\times10^{-23}

J K⁻¹)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0101 markL2 StandardCalculatorKinetic model

In the derivation of

pV=\tfrac13Nm\langle c^2\rangle

, the factor

\tfrac13

arises because

Salam Academy Original Practice · Proposed mark scheme

SA-9702-IG2-0113 marksL3 ExamCalculatorMolecular kinetic energy

The r.m.s. speed of nitrogen molecules is

510

m s⁻¹ at

290

K. Calculate the r.m.s. speed of hydrogen molecules at the same temperature. (Molar masses: N₂

28

g mol⁻¹, H₂

2.0

g mol⁻¹)

Salam Academy Original Practice · Proposed mark scheme