1. The process of dissolving solid ammonium nitrate in water is endothermic. Which statement is true?

(A) The solubility of ammonium nitrate becomes larger at higher temperatures.
(B) The solubility of ammonium nitrate becomes lower at higher temperatures.
(C) The solubility of ammonium nitrate is not affected by temperature.
(D) One cannot predict the solubility behavior of ammonium nitrate from the information given.

2. A compound containing an oxygen atom in the +2 oxidation state is

(A) OF₂
(B) H₂O
(C) K₂O₂
(D) Li₂O

3. In the reaction

6 KI + 2 KMnO₄ + 4 H₂O ------> 3 I₂ + 2 MnO₂ + 8 KOH

which atom undergoes oxidation?

(A) K
(B) Mn
(C) O
(D) I

4. For the unbalanced oxidation-reduction reaction

Ag₂S(s) + NO₃¯ (aq) ----> Ag⁺ (aq) + S(s) + NO(g)

which takes place in an acidic solution, what is the balanced half-reaction for the process that involves reduction?

(A) Ag₂S(s) ---> 2 Ag⁺(aq) + S(s) + NO(g)
(B) S²¯(aq) ---> S(s) + 2e¯
(C) NO₃¯ (aq) + 4 H⁺(aq) + 3e¯ ---> NO(g) + 2 H₂O(l)
(D) NO₃¯ (aq) + 2 H⁺(aq) + 2e¯ ---> NO(g) + 2 OH¯(aq)

5. In the Arrhenius picture of acids and bases, the reaction of an acid with a base always results in the formation of

(A) H⁺
(B) OH¯
(C) CO₂
(D) H₂O

6. A basic oxide is

(A) CaO
(B) N₂O₅
(C) CO₂
(D) SiO₂

7. A standard solution of 0.165 M HCl is being used to determine the concentration of an unknown NaOH solution. If 25.5 mL of the acid solution are required to neutralize 15.0 mL of the base, what is the molarity of the NaOH solution?

(A) (0.165) / (25.5 + 15.0) M
(B) (15.0) / (0.165) (25.5) M
(C) (0.165) (15.0 / 25.5) M
(D) (0.165) (25.5 / 15.0) M

8. The half-life of radioactive ⁵⁵Cr is 1.8 hours. The delivery of a sample of this isotope from the reactor to your laboratory requires about 10.8 hours. What is the minimum amount of such material that should be shipped in order that you receive 1.0 milligram of ⁵⁵Cr?

(A) 128 mg
(B) 64 mg
(C) 32 mg
(D) 11 mg

9. A catalyst that increases the rate of a reaction does so by

(A) increasing the concentrations of the initial reactants
(B) increasing the temperature
(C) decreasing the temperature
(D) decreasing the activation energy for the process

10. Seawater contains a fairly high concentration of Mg²⁺(aq) ion, about 0.05 M. Seawater therefore would not be expected to contain very large concentrations of

(A) Cl¯
(B) SO₄²¯
(C) K⁺
(D) OH¯

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