1 292 k 2 315 k 3 216 k 4 107 k 5 136 k correct

1. 292 K
2. 315 K
3. 216 K
4. 107 K
5. 136 K correct
Explanation:
Follow the 1 atm line horizontally to the
solid/liquid line and read from the tempera-
ture scale ≈ 136 K.
023 (part 2 of 3) 10 points
In the previous phase diagram, the three zones
that are depicted as I, II, and III are which of
the following?
1. I-liquid; II-gas; III-solid
2. I-vapor; II-solution; III-blend
3. I-solid; II-liquid; III-gas
4. I-gas; II-solid; III-plasma
5. I-liquid; II-solid; III-gas correct
Explanation:
Zone II is solid, zone III is gas, and zone I
is liquid.
024 (part 3 of 3) 10 points
Referring to the same phase diagram, the sub-
stance is heated from 100 K to 300 K at a
pressure of 50 atm. Which of the following
happens to the substance?
1. sublimation
2. deposition
3. vaporization
4. fusion and sublimation
5. condensation
6. fusion
7. sublimation and vaporization
8. condensation and vaporization
9. solidification
10. melting and vaporization correct
Explanation:
The solid/liquid line is crossed, so melting
occurs. Then the liquid/gas line is crossed, so
vaporization occurs.
025 (part 1 of 1) 10 points
Which of the following statements about col-
ligative properties of aqueous solutions is
FALSE?
1. The higher the concentration of solute in
the solution, the higher the vapor pressure of
the solvent. correct
2. Osmosis is a colligative property.
3. Colligative properties only depend on the
number of solute particles present in solu-
tion.
4. For a given solution, the freezing point
will be lowered more than the boiling point
will be raised.

Yoon, Seong Meen – Exam 1 – Due: Sep 18 2007, 3:00 pm – Inst: James Holcombe 9
Explanation:
Colligative properties, which include osmo-
sis, vapor pressure lowering, melting and boil-
ing point elevations, depend only on the num-
ber of solute particles present in solution, not
on their properties. The effect on the melting
point of a given solution is less than the effect
on its boiling point.
With a higher concentration of non-volatile
solute the concentration of the solvent in the
solution is lower, causing the vapor pressure
of the solution to be lower.
026 (part 1 of 1) 10 points
Henry’s Law would allow one to predict
1. the extent of dissociation of solute in
solution.
2. elevation in boiling point with the addi-
tion of a non-volatile solute.
3. the new pressure of a gas if only the
volume of the vessel containing the gas were
changed.
4. the vapor pressure of the solvent above
the pure solvent.
5. the solubility of a gas in a liquid given the
pressure of gas above the solution. correct
Explanation:
Henry’s law states that the pressure of a gas
above the surface of a solution is proportional
to the concentration of gas dissolved in the
solution.
027 (part 1 of 1) 10 points
In discussions of global warming, CO
2
and
H
2
O are considered “greenhouse gases” be-
cause
1. together they make up a major portion ( >
50%) of the atmosphere above the planet.