1) Van der Waals forces include both attractive and repulsivecomponents.

Select one:

True False

2) Like Coulombic forces, van der Waals forces show a distancedependence .

Select one:

True False

3) The weakest hydrogen bonds have O-H...O bond angles of 180degree.

Select one:

True False

4) Which intermolecular force has the longest range?

Select one:

a. monopole-monopole

b. monopole-dipole

c. monopole-induced dipole

d. dipole-induced dipole

e. dipole-dipole

5) Why is it easier to remove 2s electron from Li compared to a1s electron?

Select one:

a. The 2s electrons feel greater Coulombic repulsion from thenucleus.

b. In part, because the radical extent of the 1s orbital isgreater than thatof the 2s orbital.

c. The 1s orbital is higher in energy than the 2s orbital.

d. In part, because the 1s electrons shieldthe 2s electrons fromCoulombic attraction to the nucleus.

6. Provide a rationale for why n-octane (linear compound) has aboiling point of 126 degree C whereas branched isomer2,2,3,3-tetramethylbutane has a melting point of 107 degree C. Youranswer should also include a mention of symmetry and pointgroups.

7) Is the distance dependence for a permanent dipole-permanentdipole interaction always 1/r^3 ? Justify your answer.

8) Match the potential energy distance dependence with theintermolecular force described

Monopole-permanent dipole 1/r^2

induced dipole-induced dipole 1/r

Permanent dipole-permanent dipole (fixed) 1/r^6

Dipole-induced dipole 1/r^3

monopole-monopole 1/r^4

Monopole-induced dipole