Intermolecular Forces Worksheet
1. For each of the following compounds, determine the intermolecular force(s) involved in each.
You may find it useful to draw Lewis structures for some of these molecules:
Nitrogen
carbon tetrachloride
H2S
sulfur monoxide
N2H2
boron trihydride
CH4O
SiH2O
2. What is the strongest intermolecular force present for each of the following compounds?
Water
carbon tetrachloride
ammonia
carbon dioxide
phosphorus trichloride
nitrogen
ethane (C2H6)
acetone (CH2O)
methanol (CH3OH)
borane (BH3)
FCN
HCN
3. Explain why ethyl alcohol (C2H5OH) has a higher boiling point (78.40 C) than methyl alcohol
(CH3OH; 64.70 C).
4. Rank the following by from lowest to highest anticipated boiling point: C2H4, CH4, Ne,
H3COCH3.
Compd
N2
CO
Br2
ICl
Mol. Wt.
Boil Point
-196 oC
-192 oC
59 oC
97 oC
28
28
160
162
5. Using the chart above answer the following questions
a. Which compound has the weakest force?
b. Which compound has the strongest force?
c. What force holds Br2 together in the liquid state?
6. How can non-polar molecules such as Br2, I2, and N2 condense to form liquids and solids?
Molecule
CH4 (methane)
C2H6 (ethane)
C3H8 (propane)
C4H10 (butane)
Boiling Point (oC)
- 161.5
- 88.6
- 42.1
- 0.5
7. Using the chart above explain why the boiling points for the molecules above decrease as
H’s and C’s increase