Unit 5 Quiz--Phase Diagrams--Thurston High Chemistry

     

Multiple Choice (Choose the best answer.)



A pure solid substance is heated as indicated in the diagram at right. Use the diagram answer questions 1 - 6.

  1. On which portion(s) of the graph is only a liquid present?

    A

    B

    C

    D

    E

  2. On which portion(s) of the graph is a liquid (and maybe other phases of matter) present?

    B only

    C only

    D only

    B, C, and D only

    None of these are correct.

  3. On which portion(s) of the graph is only a gas present?

    A

    B

    C

    D

    E

  4. On which portion(s) of the graph is only a solid present?

    A

    B

    C

    D

    E

  5. On which portion(s) of the graph is a solid (and maybe other phases of matter) present?

    A

    B

    C

    A and B

    A, B, and C

  6. Which section of the graph indicates the boiling point?

    A

    B

    C

    D

    E

  7. Which section of the graph indicates the freezing point?

    A

    B

    C

    D

    E

  8. Which section of the graph indicates the melting point?

    A

    B

    C

    D

    E

  9. On which portion(s) of the graph would you use the formula, Specfic Heat x Mass X T, to calculate the energy change?

    A

    C

    E

    B and D

    A, C, and E

  10. On which portion(s) of the grpah would you use the formula, number of moles x Hvap, to calculate the energy change?

    A

    C

    E

    D

    A, C, and E

    The vapor pressures of four substances at various temperatures are shown in the graph at right. Use this graph to answer questions 11 - 15 below.

  11. What is the normal boiling temperature of chloroform and ethanoic acid, respectively?

    10 oC and 0 oC

    60 oC and 121 oC

    101.3 oC and 101.3 oC

    ~ 300 oC and 53 oC

    None of these are correct.

  12. At 60 KPa, water would boil at what temperature?

    22 oC

    86 oC

    100 oC

    101.3 oC

    None of these are correct.

  13. If atmospheric pressure was 80 KPa, which substances could boil at 60o C?

    Chloroform

    Chloroform and Ethanol

    Chloroform, Ethanol, and Water

    Chloroform, Ethanol, Water, and Ethanoic Acid

    None of these are correct.

  14. Which of these substances has the highest intermolecular attractions?

    Chloroform

    Ethanol

    Water

    Ethanoic Acid

    It is impossible to predict.

  15. Which of these substances probably has the lowest heat of vaporization (Hvap)?

    Chloroform

    Ethanol

    Water

    Ethanoic Acid

    It is impossible to predict.

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