Name _________________
CHEM 1004
Test #4
Spring 2011 (Buckley)
Multiple choice. (2 points each) Circle the letter corresponding to the best answer for each of the
following questions.
1. Which of the following statements is not true about an acid?
a.
b.
c.
d.
it turns red litmus paper blue
it has a sour taste
reacts with metals such as zinc to produce hydrogen gas
reacts with a base to form a salt and water
2. Which of the following is not true of the Arrhenius theory of acids and bases?
a.
b.
c.
d.
Bases are defined as compounds that produce OH- ions in water solution.
Acids are defined as compounds that produce H+ ions in water solution.
Arrhenius theory only applies to reactions in aqueous solution.
Acids and bases react to form a different set of acids and bases
3. A hydrogen ion, H+, in water can also be represented as:
a.
b.
c.
d.
H2O
H3O+
OHH-
4. When HCl is added to pure water, HCl molecules lose protons while water molecules
gain protons. In this reaction, HCl is a(n)
a.
b.
c.
d.
acid
base
salt
solvent
5. Which of the following is not a base?
a.
b.
c.
d.
NH3
KOH
HNO3
Ba(OH)2
6. The compound CH3NH2 reacts with water to form CH3NH3+ and OH-. In this reaction,
CH3NH2 is acting as a(n)
a.
b.
c.
d.
acid
salt
base
catalyst
7. Which of the following is an example of a nonmetal oxide?
a.
b.
c.
d.
Li2O
HCl
CO2
HNO3
8. Which of the following would produce an acid when added to water?
a.
b.
c.
d.
Na2O
Ba(OH)2
SO3
K2O
9. HCN is classified as a weak acid in water. This means that it produces
a.
b.
c.
d.
no hydrogen ions
a relatively small fraction of the maximum number of hydrogen ions
a relatively large fraction of the maximum number of hydrogen ions
100% of the possible hydrogen ions
10. Which of the following is the correct balanced equation for the neutralization of barium
hydroxide with hydrochloric acid?
a.
b.
c.
d.
Ba(OH)2 + 2 HCl → BaCl2 + 2 H2O
BaOH2 + 2 HCl → BaCl2 + H2O
Ba(OH)2 + HCl → BaCl2 + H2O
BaOH + HCl → BaCl + H2O
11. A toilet bowl cleaner has a pH of 1.0. The toilet bowl cleaner is
a.
b.
c.
d.
strongly acidic
strongly basic
weakly acidic
weakly basic
12. The concentration of H+ in a solution is 0.001 M. The pH of the solution is:
a.
b.
c.
d.
1 × 10-3 M
-3 M
3M
2M
13. If a solution has a pH of 4.2, what can you say about the concentration of H+ in the
solution?
a.
b.
c.
d.
it is 0.00042 M
it is between 10-4 and 10-5 M
it is between 10-3 and 10-4 M
it is between 10-5 and 10-6 M
14. Which of the following is NOT a definition of reduction?
a.
b.
c.
d.
Reduction is the gain of electrons by a substance.
Reduction is the loss of electrons by a substance.
Reduction is the loss of oxygen by a substance.
Reduction is the gain of hydrogen by a substance.
15. In which of the following is the substance undergoing oxidation? (Note: These reactions
are not complete chemical equations.)
a.
b.
c.
d.
Cl2 → 2 ClC → CO2
WO3 → W
2 H+ → H2
16. Consider the reaction
C2H6O2 → C2H4O2 + H2
The C2H6O2 in the reaction is
a.
b.
c.
d.
oxidized
reduced
neutralized
combusted
17. In the reaction:
Cu+ + Fe → Cu + Fe2+
a.
b.
c.
d.
iron is reduced
copper is oxidized
the copper ion is the reducing agent
none of the above
18. Silver is plated on copper by immersing a piece of copper into a solution containing
silver ions. In the plating reaction silver ions
a.
b.
c.
d.
lose one electron and are oxidized
lose one electron and are reduced
gain one electron and are oxidized
gain one electron and are reduced
19. Consider the reaction
2 Fe + 3 Mg2+ → 2 Fe3+ + 3 Mg
The half reaction for the reduction in this reaction is
a.
b.
c.
d.
Fe → Fe3+ + 3 eFe3+ + 3 e- → Fe
Mg → Mg2+ + 2 eMg2+ + 2 e- → Mg
20. In an electrochemical cell, the anode
a.
b.
c.
d.
is the electrode at which oxidation occurs
is the negative electrode
supplies electrons to the other electrode
all of the above
Short answer problems. Point totals are indicated in parentheses to the right of each number.
21. (8 points) Label each half-reaction below as either oxidation or reduction and then
combine them to obtain a balanced overall redox reaction.
a.
WO3 + 6 H+ + 6 e- → W + 3 H2O
and
C2H8O → C2H6O + 2 H+ + 2 e-
b.
Al →
Al3+ + 3 e-
Cr2+ + 2 e- → Cr
and