Physics · OCR H556 · Topic 5.1

Thermal physics

Temperature, solid, liquid and gas, thermal properties of materials, ideal gases.

  • 5 sub-topics
  • Taught in Year 13
  • 49 practice questions
  • 5 animated lessons
Practice questions (49) Lessons Worksheets coming soon All OCR Physics topics

What the specification says

Every sub-topic OCR can examine in this topic, with its reference number from the official specification. The Y12 and Y13 tags show when each sub-topic is usually taught.

  1. 5.1.1TemperatureY13
  2. 5.1.2Solid, liquid and gasY13
  3. 5.1.3Thermal properties of materialsY13
  4. 5.1.4Ideal gasesY13
  5. 5.1.4Ideal gases: the kinetic theory modelY13

Try 3 questions

Easy, medium and hard questions from this topic, each with a worked solutions and the mark for every step. All 49 questions in this topic, free, no account needed.

Thermodynamics

Not needed for Year 12Easy

Internal energy · Year 13 · 3 marks

Ice at 0 °C is heated until it has all melted.
  1. (a)
    Define internal energy.
    (1)
  2. (b)
    Explain why the temperature stays constant while the ice melts, although energy is supplied.
    (2)
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Part (a)1 mark

  1. The sum of the random kinetic and potential energies of the molecules.

Part (b)2 marks

  1. The energy increases the potential energy of the molecules (breaking bonds),
  2. not their mean kinetic energy, which depends on temperature.

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Thermodynamics

Not needed for Year 12Medium

Ideal gases · Year 13 · 1 mark

  1. A fixed mass of ideal gas in a sealed rigid container is heated from 27 °C to 127 °C. What happens to its pressure?
    (1)

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  1. At constant volume, pressure is proportional to the temperature in kelvin. Convert both temperatures first.B: It is multiplied by 43\tfrac{4}{3}

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Thermodynamics

Not needed for Year 12Hard

Kinetic theory · Year 13 · 2 marks

A gas has pressure 1.00×1051.00 \times 10^{5} Pa and density 1.43 kg m⁻³.
  1. Find the r.m.s. speed of its molecules.
    (2)

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  1. pp=13ρ⟨c2⟩{}= \tfrac{1}{3}\rho\langle c^2\rangle
  2. crms=458 m s−1c_{rms} = 458\ \mathrm{m\,s^{-1}}

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