SELF QUIZ

1. The molecules of NH₃ are: (What would have to change in the molecules to change the answer?)
    a. nonpolar
    b. polar

2. What is the shape of CH₄ molecules?
    a. angular
    b. triangular pyramidal
    c. flat triangular
    d. linear
    e. tetrahedral

3. Which of the following chemicals has the lowest boiling point: (What factors cause this to be so?)
    a. CO₂
    b. H₂O₂
    c. PbO₂
    d. SO₂
    e. SiO₂

4. The strongest bonding between particles (i.e., molecules, ions, atoms, etc.) is found in materials which are at room temperature.
    a. solids
    b. liquids
    c. gases

5. Which of the following would you expect to have polar linear molecules?
    a. CO₂
    b. H₂O
    c. ICN
    d. NaCl
    e. SiO₂
    f. SO₂

6. Alcohol evaporates more readily than water.
    Which has stronger intermolecular bonds?

    Which has the higher melting point?

    Which has the higher boiling point?

7. In water the interatomic bonds are (ionic/covalent/metallic) and the intermolecular bonds are (van der Waals/dipole-dipole/hydrogen).

8. What shape, polarity and intermolecular bond type do H₂S molecules have?

9. What type of bonding attracts NaCl to H₂O?

10. Put the following in order of increasing bond strength. (What factors caused you to select this order?)
        NH₃     N₂      NF₃

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E-mail instructor: Eden Francis

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