Practice Questions
|
|
| 1. |
Which
instrument would be best suited for use in a volumetric analysis
to find the unknown molarity of base when titrated with a known
acid? |
| (A) |
Graduated cylinder |
| (B) |
Pipette |
| (C) |
250 mL beaker |
| (D) |
Burette |
| (E) |
Triple beam balance |
|
|
| 2. |
In a neutralization
reaction performed in lab, a student mixed 0.20 M NaOH with 0.10
M HCl until the reaction was complete. After the liquid left in
the container was dried, which of the following statements must
be true? |
|
I. The student produced a salt and water. All that was left
in the container was the salt.
II. The total mass of the products in the evaporating dish
at the end of the experiment had a lower mass than before heating.
III. The student was left with an ionically bonded, white,
crystalline solid.
|
| (A) |
I only |
| (B) |
II only |
| (C) |
I and II only |
| (D) |
I and III only |
| (E) |
I, II, and III all are true |
|
|
| 3. |
Which of
the following laboratory techniques would not be a physical change
in components of a mixture? |
| (A) |
Chromatography |
| (B) |
Precipitation |
| (C) |
Filtering |
| (D) |
Distillation |
| (E) |
Evaporation |
|
|
|
| 4. |
A
student mixes 10.0 mL of 0.10 M AgNO3 with
excess copper metal. The reaction should produce 0.107 gram of silver;
however, the student obtains a mass of 150 grams of silver. Plausible explanations
for this yield >100% might include |
|
I. The student did not subtract the mass of the filter paper
before recording results.
II. The student did not thoroughly dry the sample before massing.
III. The copper metal did not react completely.
|
| (A) |
I only |
| (B) |
II only |
| (C) |
I and II only |
| (D) |
I and III only |
| (E) |
I, II, and III |
|
|
| 5. |
Which of
the following mixtures would best be separated by gravity filtration? |
| (A) |
A solid precipitate in a liquid solution |
| (B) |
A mixture of oil and water |
| (C) |
A mixture of solid iron with solid sulfur |
| (D) |
Carbon dioxide gas bubbles in a soft drink |
| (E) |
A mixture of dyes in a felt-tip pen |
|
|
| 6. |
Which of
the following statements is the most probable explanation for color
in solutions? |
| (A) |
Solutions with color contain oxygen. |
| (B) |
Solutions with color contain metals. |
| (C) |
Solutions with color are ionically bonded with water. |
| (D) |
Solutions with color usually contain transition metals
with unshared electron pairs. |
| (E) |
Solutions with color have electron configurations that
are isoelectronic with the noble gases. |
|
|
|
