Chapter 5 Practice Paper: Density and the particle model — question paper

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1. 1

   The particles of a liquid, compared with those of a solid,

   1. Aare locked in place
   2. Bmove at zero energy
   3. Care a different substance
   4. Dare further apart and free to slide past each other
   ( )
2. 2

   Density is calculated as

   1. Avolume ÷ mass
   2. Bmass × volume
   3. Cmass ÷ volume
   4. Dmass ÷ area
   ( )
3. 3

   A flat section on a heating curve means the substance is

   1. Aboiling over
   2. Bchanging state
   3. Ccooling down
   4. Dat absolute zero
   ( )
4. 4

   Which apparatus measures the volume of a lump of rock?

   1. Aa eureka can and a measuring cylinder
   2. Ba ruler
   3. Ca balance
   4. Da thermometer
   ( )
5. 5

   The energy needed to change 1 kg of a substance from liquid to gas at constant temperature is its

   1. Aspecific heat capacity
   2. Bspecific latent heat of fusion
   3. Cinternal energy
   4. Dspecific latent heat of vaporisation
   ( )
6. 6

   Gas pressure rises when the gas is heated at constant volume because

   1. Aparticles get larger
   2. Bparticles stop moving
   3. Cfaster particles collide more often and harder
   4. Dthe container expands
   ( )
7. 7

   1 g/cm³ expressed in kg/m³ is

   1. A1 000 kg/m³
   2. B0.001 kg/m³
   3. C10 kg/m³
   4. D1 000 000 kg/m³
   ( )
8. 8

   Melting 2.0 kg of a solid whose latent heat of fusion is 300 000 J/kg requires

   1. A150 000 J
   2. B600 000 J
   3. C300 000 J
   4. D60 000 J
   ( )
9. 9

   At constant temperature, compressing a gas to a quarter of its volume makes its pressure

   1. Aa quarter
   2. Bdouble
   3. Cfour times
   4. Dunchanged
   ( )
10. 10

    Ice floats on water because, on freezing, the particles

    1. Again mass
    2. Bspeed up
    3. Cbecome a new substance
    4. Dform an open arrangement that is less dense
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   A student determines the density of a metal cube.

   1. (a)

      Describe the measurements needed and the instruments used.

      [2]
   2. (b)

      The cube has mass 453.6 g and side 4.0 cm. Calculate its density in g/cm³.

      [2]
   3. (c)

      Suggest which metal this is likely to be, from iron (7.9), zinc (7.1), copper (8.9) in g/cm³.

      [1]
2. 12

   This question is about changes of state and energy.

   1. (a)

      Name the change of state in which a liquid becomes a gas throughout the liquid at a fixed temperature.

      [1]
   2. (b)

      Explain why the temperature stays constant while a pure substance boils.

      [2]
   3. (c)

      Calculate the energy to melt 0.40 kg of a metal with latent heat of fusion 250 000 J/kg.

      [2]
   4. (d)

      The same metal (specific heat capacity 380 J/kg °C) is then heated as a liquid by 150 °C. Calculate that energy for 0.40 kg.

      [2]
   5. (e)

      State why the two calculations use different equations.

      [2]
3. 13

   A scuba diving tank holds gas at 200 kPa occupying 0.030 m³. The gas is squeezed (at constant temperature) into a damaged cylinder of volume 0.012 m³. (Higher)

   1. (a)

      Calculate the pressure in the smaller cylinder.

      pressure =[2]
   2. (b)

      Explain the new pressure using the behaviour of the gas particles.

      [2]
   3. (c)

      State what happens to the gas temperature during a very fast compression, and why.

      [2]