1- Use a wave model of bonding to explain why the He2 molecule doesn%u2019t exist.

2- Draw the orbital energy diagram for O2. What feature of oxygen%u2019s properties is revealed in this diagram?

3-For the following molecules or ions, draw the Lewis dot pictures and also draw a figure indicating the structure. In particular please be clear about the location of lone pairs in your structural drawing.

a) CO32

b) SF4

c) SO2

d) NH4+

e) PO43-

4 - Are SF4 and SO2 polar or nonpolar and why?

5-Briefly explain London dispersion forces

6-Why is the boiling point of octane, C8H18, higher than that of methane, CH4, if they are both nonpolar molecules?

7-Using a diagram to illustrate your answer, explain the effect of temperature on the vapor pressure of a liquid.

8-Using a diagram to illustrate your answer, explain the differences in vapor pressure of two molecules, A and B, if the intermolecular forces of B are greater than those of A.

9- Hydrogen bonding is far stronger than a typical dipole-dipole bond. Why is this true? What is it that accounts for the strength of hydrogen bonding?

10- Draw and label the phase diagram for water. What is going on for each of the lines?