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Chapter 7 Practice Paper: Kinetic Particle Model of Matter — question paper

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QQ/S3CPH/CH7

Secondary 3 · Combined Science (Physics) (G2 / G3)

Chapter 7 Practice Paper

Kinetic Particle Model of Matter

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Physics) syllabus. It is not an official MOE or school examination paper. Chapter 7 (comparing solids, liquids and gases; arrangement, motion, forces and distances between particles; temperature and average kinetic energy; internal energy; melting, solidification, boiling and condensation at constant temperature).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which state of matter has a fixed volume but takes the shape of its container?

    1. Asolid
    2. Bliquid
    3. Cgas
    4. Dall of them
    ( )
  2. 2

    During melting at the melting point, the temperature stays constant because the energy supplied

    1. Ais destroyed
    2. Bonly warms the surroundings
    3. Cincreases the potential energy of the particles
    4. Dincreases the average kinetic energy of the particles
    ( )
  3. 3

    Air in a sealed syringe is squeezed to half its volume. The average spacing between the air particles

    1. Ahalves as well
    2. Bstays the same — particles cannot move closer
    3. Cbecomes smaller, though the particles are still far apart and moving fast
    4. Dincreases because pressure pushes them apart
    ( )
  4. 4

    A substance's internal energy is made up of

    1. Aonly the kinetic energy of its particles
    2. Bthe total kinetic and potential energies of its particles
    3. Cthe energy of its bonds only
    4. Dthe same thing as its temperature
    ( )
  5. 5

    A heating curve for a substance being heated shows a horizontal section. During that section the substance is

    1. Achanging state at constant temperature
    2. Bheating up rapidly
    3. Ccooling down
    4. Dboiling at different temperatures
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    Use the kinetic particle model to answer this question.

    1. (a)

      Describe the arrangement, separation and motion of the particles in a solid.

      [2]
    2. (b)

      Describe the arrangement, separation and motion of the particles in a liquid.

      [2]
    3. (c)

      Describe the arrangement, separation and motion of the particles in a gas.

      [2]
  2. 2

    A pan of water is heated steadily on a stove from 20 °C until it has all boiled away.

    1. (a)

      Describe what happens to the average kinetic energy of the water particles while the temperature rises from 20 °C towards 100 °C.

      [2]
    2. (b)

      Explain why the temperature then stays at 100 °C while the water boils, even though heating continues.

      [3]
    3. (c)

      State what happens to the total internal energy of the water during the whole process, with a reason.

      [2]
  3. 3

    A sealed plastic syringe contains air. A second identical syringe contains water.

    1. (a)

      The plunger of the air-filled syringe can be pushed in a long way; the water-filled one barely moves. Explain both observations using the particle model.

      [4]
    2. (b)

      Explain why the air expands to fill the whole syringe whichever way up it is held.

      [2]
    3. (c)

      State one property that liquids and gases share.

      [1]

— End of paper —