Practice Questions
|
Statement I |
| Statement
II |
| 1. |
Ice, unlike most substances, is denser than
water in the liquid phase. |
BECAUSE | In water, hydrogen
bonds can form between the positively charged H atom on one water
molecule and the slightly negatively charged O atom on a nearby
water molecule. |
|
|
| 2. |
Which
of the following gases would be the densest at standard temperature
and pressure? |
| (A) |
Helium |
| (B) |
Argon |
| (C) |
Carbon dioxide |
| (D) |
Xenon |
| (E) |
Nitrogen |
|
|
| 3. |
In the laboratory,
a sample of hydrogen is collected by water displacement. The sample
of hydrogen has a volume of 25 mL at 24.0ºC and a barometric pressure
for the day of 758 mmHg. What is the pressure of the dry gas at
this temperature? (The vapor pressure of water at 24.0ºC is 22.4
mmHg.) |
| (A) |
455 mmHg |
| (B) |
470 mmHg |
| (C) |
736 mmHg |
| (D) |
758 mmHg |
| (E) |
780 mmHg |
|
|
| 4. |
Calculate
the approximate amount of heat necessary to raise the temperature
of 50.0 grams of liquid water from 10.0ºC to 30.0ºC. (The specific
heat of water liquid is 4.18 J/gºC.) |
| (A) |
20 J |
| (B) |
80 J |
| (C) |
100 J |
| (D) |
200 J |
| (E) |
4,180 J |
|
|
| 5. |
Using the sketch of the phase
diagram for water given above, determine which of the following statements
is incorrect: |
| (A) |
The triple point is point A.
This is the point at which all three phases are in equilibrium with
one another. |
| (B) |
The line AB is the line
representing the solid-liquid equilibrium line. Anywhere along this
line the substance could melt or freeze. |
| (C) |
The slope of line AB is
negative. This slope indicates that the solid is much denser than
the liquid. |
| (D) |
Line AD represents the phase
changes of sublimation and deposition. |
| (E) |
Line AC represents where
the substance would condense and vaporize. |
|
|
Statement I |
| Statement
II |
| 6. |
Most ionic solids have high melting points. |
BECAUSE | Ionic solids are
made up of positive and negative ions held together by electrostatic
attractions. |
|
|
| 7. |
Which
of the following best illustrates a graph of pressure versus volume
for a gas at constant temperature? |
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
|
|
| 8. |
Which of
the following solutions would probably have the highest boiling
point? |
| (A) |
0.100 m KOH |
| (B) |
0.100 m Na2SO4 |
| (C) |
0.100 m C6H12O6 |
| (D) |
0.200 m CaCl2 |
| (E) |
0.200 m CH3CH2OH |
|
|
| 9. |
Which of
the following must be measured in order to calculate the molality
of a solution? |
|
I. Mass of the solute
II. Mass of the solvent
III. Total volume of the solution
|
| (A) |
I only |
| (B) |
I and III only |
| (C) |
II and III only |
| (D) |
I and II only |
| (E) |
I, II, and III |
|
|
|
| 10. |
The
molarity of a solution that is composed of 80.00 g of sodium hydroxide
dissolved in 2.0 L of solution is |
| (A) |
1.0 M |
| (B) |
2.0 M |
| (C) |
4.0 M |
| (D) |
40.0 M |
| (E) |
160.0 M |
|
|
| 11. |
Which of
the following substances would dissociate completely when placed
into excess amounts of distilled water? |
| (A) |
C2H5OH |
| (B) |
HC2H3O2 |
| (C) |
LiNO3 |
| (D) |
Mg(OH)2 |
| (E) |
All of these will dissociate completely in
water |
|
|
Statement I |
| Statement
II |
| 12. |
The solubility of carbon dioxide in a soft
drink decreases with a decrease in pressure. |
BECAUSE | The solubility
of a gas generally increases with an increase in temperature. |
|
|
| 13. |
The
molarity of a solution obtained when 50.0 mL of 6.0 M HCl is diluted
to a final volume of 300.0 mL is |
| (A) |
0.01 M |
| (B) |
0.10 M |
| (C) |
0.20 M |
| (D) |
0.30 M |
| (E) |
1.0 M |
|
|
| 14. |
Which of
the following solutes and solvents would be expected to form stable
solutions? |
|
|
| (A) |
I only |
| (B) |
I and II only |
| (C) |
III only |
| (D) |
I, II, and III only |
| (E) |
I, II, and IV only |
|
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