Molecular Geometry Practice SetLevel 2

1. Describe (in detail) two types of exceptions to the octet rule.

2. Write Lewis Diagrams for the following molecules or ions. Remember to look for resonance structures whenever you introduce multiple bonds.a. TeS2

b. BH3

c. AlCl3

d. ClO3–

3. Determine if the following molecules are polar or nonpolar.a. HF

b. PCl5

c. PCl3

d. CBr4

Laliberte, 4/28/08

e. SO2

4. Between IF3 and FI3, one exists and the other doesn’t. Explain.

5. Find the electronegativity for each bond in the following molecules and classify each bond as ionic, polar covalent, or nonpolar covalent.a. Na2O

b. N2O

O ║

c. CH2O ( H – C – H )

6. Which would have stronger intermolecular forces, NH3 or PH3? Explain.

7. For each, which would have a higher boiling point? Explain.a. Ne or Xe

b. SF4 or SF6

8. The molecule N2 is nonpolar. Since attractions between molecules are an attraction between positive and negative charges, would it be possible for N2 molecules to attract other N2 molecules? In other words, could N2 condense into a liquid? Explain using diagrams.

Laliberte, 4/28/08