1. Which one of the following is a non-electrolyte?
A. HCN (aq)
B. HClO3 (aq)
C. NaF (aq)
D. C6H6
E. H2C2O4
2. What is the coefficient of H2 when the following equation is correctly balanced?
CO (g) + H2 (g)  H2O (g) + CH4 (g)
A. 1
B. 2
C. 3
D. 4
E. None of these is the correct coefficient of H2
3. Which of the following reactions is a displacement reaction?
A. C + O2  CO2
B. 2 Al + N2  2 AlN
C. 2 Mg + O2  2 MgO
D. MgO + H2O  Mg(OH)2
E. Fe(NO3)2 + Na2S  FeS + 2 NaNO3
4. The reaction between calcium hydroxide and hydrochloric acid produces:
A. a molecular compound and a weak electrolyte.
B. two weak electrolytes.
C. two strong electrolytes.
D. a molecular compound and a strong electrolyte.
E. two molecular compounds.
5. Which ion(s) is(are) spectator ions in the reaction between aqueous solutions of CaI 2 and AgNO3?
A. Ca2+ and NO3B. Ag+ and IC. NO3- and ID. NO3E. Ca2+ and Ag+
6. A solid was found to be highly soluble in water. Treating separate portions of a solution of this solid with
KCl, KBr, KI, K2SO4, K2CO3, K3PO4, KOH, and K2S produced no precipitates. Treatment of an aqueous
solution of the substance with an acid resulted in the formation of the unpleasant smelling gas, H 2S. The
unknown solid was:
A. Hg2(NO3)2
B. LiBr
C. Na2S
D. Na2CO3
E. PbSO4
7. The balanced net ionic equation resulting from addition of aqueous
hydrochloric acid to solid chromium(III) hydroxide is:
A. Cr(OH)3 (s) + 3 HCl (aq)  3 H2O (l) + CrCl3 (aq)
B. Cr(OH)3 (s) + 3 Cl- (aq)  3 OH- (l) + CrCl3 (aq)
C. Cr(OH)3 (s) + 3 H+ + 3 Cl- (aq)  3 H2O (l) + Cr3+ + 3 Cl- (aq)
D. Cr(OH)3 (s) + 3 H+  3 H2O(l) + Cr3+
E. Cr(OH)3 (s) + 3 H+ + 3 Cl- (aq)  3 H2O (l) + CrCl3 (s)
8. Which of the following reactions is a redox reaction?
A. Na2SO4 + BaCl2  BaSO4 + 2 NaCl
B. Pb2+ + 2 Cl-  PbCl2
C. 2 Fe + 3 S  Fe2S3
D. 2 Na2CrO4 + H2O  Na2Cr2O7 + 2 NaOH
E. both (C) and (D) are redox reactions
9. When the following reaction is balanced in acid solution, what is the coefficient for the H + ion?
Cr2O7 2- + S2O3 2-
 Cr3+ + S4O6 2-
A. 2
B. 6
C. 8
D. 12
E. 14
10. What is the reducing agent for the reaction in problem (9)?
A. H+
B. Cr2O72C. S2O32D. Cr3+
E. S4O62-
Answer Sheet
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Directions

Neatly write your responses in the spaces provided. Use a blue or black pen. Don't write in the margins.
Attach additional sheets if needed, and include the submission information on each additional sheet.

Remember to complete the submission information on every page you turn in.
Free-Response Questions
Time Limit: You have 30 minutes to complete this section.
Scoring: 60 points total; question 1 is worth 30 points and question 2 is worth 30 points;
points for each section are indicated within the question.
1. Jessica finds six solutions in test tubes labeled A-F inside a box. The outside of the box has a label stating
that inside there are six test tubes containing solutions of AgNO 3, Fe(NO3)3, Ca(NO3)2, NaCl, NaOH, and
Na2CO3. Jessica knows that by using the solubility rules that she can make combinations of the
solutions and identify the solution in each test tube. The results of Jessica's experiments are presented in the
following table:
A
A
B
C
D
E
B
C
D
E
F
No rxn
Ppt form
No rxn
Ppt form
No rxn
No rxn
Ppt form
No rxn
No rxn
Ppt form
No rxn
Ppt form
Ppt form
No rxn
No rxn
Based on these experimental results, identify solutions A-F. Explain your reasoning, using net ionic equations
where appropriate.
2. Consider the following reaction: Pb(OH)42- (aq) + ClO- (aq)  PbO2 (s) + Cl- (aq) in basic solution.
1. Determine the element being oxidized. What is its oxidation number as a reactant and as a product?
(3 points)
2. Determine the element being reduced. What is its oxidation number as a reactant and as a product?
(3 points)
3. Write and balance the oxidation half-reaction in basic solution. (8 points)
4. Write and balance the reduction half-reaction in basic solution. (8 points)
5. Write the overall balanced net ionic equation in basic solution for this reaction. (6 points)
6. What is the reducing agent in this reaction? (2 points)