Name _______________________
CHEM 1474
Test #1
Spring 2013 (Buckley)
Point values are listed in parentheses to the right of each problem number.
1. (10 points) List the all of the intermolecular forces present in each of the following
species.
a. NBr3 _________________________________________________
b. CH2F2 ________________________________________________
c. CH3CH2OH ___________________________________________
d. CH3OCH3 _____________________________________________
e. BF3 ___________________________________________________
2. (3 points) Consider CS2 and CO2. Which of these compounds would you expect to have
the higher boiling point? Briefly explain your reasoning.
3. (3 points) Consider NF3 and BF3. Which would you expect to have the higher vapor
pressure? Briefly explain your reasoning.
4. (3 points) Consider CH3CH2CH2CH2CH2CH3 and CH3CH2CH2CH2CH2 CH2CH2CH3.
Which of these compounds would you expect to have the higher viscosity? Briefly
explain your reasoning.
Consider the phase diagram to the right as
you answer questions 5 – 7.
C
D
5. (2 points) What are the critical point
temperature and pressure for this
material?
6. (2 points) What are temperature and the
pressure at the triple point?
B
A
7. (5 points) Suppose the substance starts at
Point A on the diagram and is subjected
to temperature and pressure changes
according to the sequence A  B  C
 D  E. Describe what happens in this process paying particular attention to the
physical state(s) present at A, B, C, D, and E. Use the back of the page if necessary.
E
8. (3 points) Arrange the following aqueous solutions in order of decreasing freezing point.
0.10 m Ba(NO3)2, 0.20 m NaCl, 0.25 m C2H6O2
________________ > __________________ > _________________
9. (3 points) Arrange the following aqueous solutions in order of increasing osmotic
pressure.
0.15 M Ca(NO3)2, 0.10 m BaBr2, 0.20 m KCl
________________ < __________________ < ____________________
10. (12 points) A solution is made by dissolving 80.0-g of CaCl2 in 120.0-g of water. The
density of the resulting solution is 1.396 g/mL. Find the % by mass of CaCl2, molarity of
CaCl2, molality of CaCl2, and mole fraction of CaCl2 in the solution. Show your work.
(Notice we want the concentration of the solute – not the concentration of particles.)
11. (12 points) Find the freezing point, boiling point, vapor pressure at 25 °C, and osmotic
pressure at 25 °C of the solution from Question 10. For water Kf = 1.86 °C/m, Kb = 0.52
°C/m, and the vapor pressure of pure water at 25 °C is 24.0 at 25 °C. R = 0.08206
L•atm/mol•K. In case you need it, the normal freezing point of water is 0 °C and the
normal boiling point is 100 °C.