1. Using Lewis (electron-dot) structures, explain why the ClF3 molecule is polar and the BF3 molecule is not polar.

2. For the following questions refer to the following diatomic species.
(A) Li2
(B) B2
(C) N2
(D) O2
(E) F2
a) Which has the largest bond-dissociation energy?
b) Which has a bond order of 2?
c) Which contains 1 stigma (s) and 2 pi (p) bonds?

3. On the basis of bonding principles, predict whether each of the following compounds exists. In each case explain your prediction.
a) NF5
b) AsF5

4. A mixture of 6gm of O2 (g) and 9gm CH4(g) is placed in a 15L vessel at 0 degreed Celsius. What is the partial pressure of each gas and what is the total pressure in the vessel?

5. Describe the intermolecular forces that must be overcome to convert these substances from a liquid to a gas.
a) SO2
b) CH3COOH
c) H2S

6. Amorphous Silica, SiO2, has a density of about 2.2gm/cc whereas the density of crystalline quartz is 2.65 gm/cc. Account for the differences in density.

7. What are face centered and body centered crystal lattice?

We have a 100mL 0.2M AgNO3 solution and a 100mL 0.2M CH3COONa solution. Please describe how to prepare a 35 mL mixture solution containing 60mM AgNO3 and 140mM CH3COONa?