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					                                                                                   States of Matter 1
                                                                                        Worksheet

1.




2. A sample of lead is heated at a constant rate. The temperature changes are shown.




     Which BEST describes what happens in the lead sample between Times 1 and 2?
     F. Gained kinetic energy separates electrons from atoms.
     G. Atoms of lead convert heat energy into additional mass
     H. Energy that the lead gains causes a phase change in the lead.
     J. The conductivity of the lead increases as the temperature increases.
                                                                               States of Matter 2
                                                                                    Worksheet

3. On a winter morning, frost on a window disappears after sunrise. Why does the ice in the
frost turn into vapor?

       A. It gains energy from solar radiation.
       B. Its bonds with the glass of the window weaken.
       C. The increase in sunlight increases its electrical repulsion.
       D. The covalent bonds holding the molecules together break as the heat increases.

4. A steam boiler uses a continuous cycle of evaporation and condensation. Which of the
   following BEST explains why evaporation and condensation play an important role in
   a steam boiler?

       F. Substances release heat energy when they evaporate and absorb heat energy when they
       condense.
       G. Substances absorb heat energy when they evaporate and release heat energy when they
       condense.
       H. Substances absorb heat energy when they freeze and release heat energy when they
       boil.
       J. Substances release heat energy when they freeze and absorb heat energy when they
       boil.

5.    An investigation was conducted in which pure substance X was cooled at a constant
     rate over time. The graph shows the phase changes of the substance over the time
     intervals as it cools.




       According to the curve, how long does it take for substance X to change phase at its
       melting point?
                                                                           States of Matter 3
                                                                                Worksheet


      A      5 minute
      B      10 minutes
      C      15 minutes
      D      20 minutes

6. An investigation was conducted on a pure substance to determine at what
   temperatures it underwent phase changes. The graph shows the phase changes of the
   pure substance as it was heated at a constant rate.




  The investigator used one of the following substances in this experiment.
        SUBSTANCE                  MELTING POINT (*C)             BOILING POINT (*C)
               1                              20                            100
               2                              40                            140
               3                              70                            140
               4                              80                            160

  Which of these substances was used in this phase change investigation?
  F Substance 1
  G Substance 2
  H Substance 3
  J Substance 4
                                                                               States of Matter 4
                                                                                    Worksheet

7. Atoms of a substance change between two different phase.




   Which of the following explains the change shown?
   A. The substance changed from a solid to a liquid by gaining energy
   B. The substance changed from a liquid to a solid by gaining energy
   C. The substance changed from a solid to a liquid by losing energy
   D. The substance changed from a liquid to a solid by losing energy.

8. Energy may be gained or lost as matter changes phase. Which cell in the chart depicts a gain
    in energy?
          F                                           TO
          R                       SOLID          LIQUID         GAS               PLASMA
          O      SOLID                           melting        1
          M      LIQUID           2                             vaporization
                 GAS              deposition     3
                 PLASMA                                         4
    A. 1
    B. 2
    C. 3
    D. 4
9. Every change of phase occurs with a change of ___________________________.
    A. Temperature
    B. Heat
    C. Chemistry
    D. Mind
10.