Choose the correct answer for each question.

1. Which one of the following is a strong electrolyte?

   1.   ?    H₂O
   2.   ?    N₂
   3.   ?    KOH
   4.   ?    C₂H₆O (ethanol)
   5.   ?    CH₃COOH (acetic acid)

2. According to solubility rules, which one of the following compounds is insoluble in water?

   1.   ?    Na₂SO₄
   2.   ?    BaSO₄
   3.   ?    CuSO₄
   4.   ?    MgSO₄
   5.   ?    Rb₂SO₄

3. In accordance with the solubility rules, which of the following is true when solutions of ZnSO_4(aq) and MgCl_2(aq) are mixed?

   1.   ?    ZnCl₂ will precipitate, and Mg²⁺ and SO₄^2- will be spectator ions.
   2.   ?    ZnSO₄ will precipitate, and Mg²⁺ and Cl^- will be spectator ions.
   3.   ?    MgSO₄ will precipitate, and Zn²⁺ and Cl^- will be spectator ions.
   4.   ?    MgCl₂ will precipitate, and Zn²⁺ and SO₄^2- will be spectator ions.
   5.   ?    No precipitate will form.

4. Which choice gives the correct formula of the salt formed in the neutralization reaction of hydrochloric acid and calcium hydroxide?

   1.   ?    CaO
   2.   ?    CaCl₂
   3.   ?    CaH₂
   4.   ?    CaCl
   5.   ?    CaClH

5. The oxidation number of N in NaNO₃ is:

   1.   ?    +6
   2.   ?    +5
   3.   ?    +3
   4.   ?    -3
   5.   ?    None of them.

6. What element is oxidized in the following reaction?
   3Cu + 8HNO₃ -> Cu(NO₃)₂ + 2NO + 4H₂O

   1.   ?    Cu
   2.   ?    H
   3.   ?    N
   4.   ?    O
   5.   ?    H₂O

7. If 20.0 mL of standardized .2M NaOH are required to titrate 100. mL of an unknown HI solution, what was the molarity of the acid?

   1.   ?    .01M
   2.   ?    .02M
   3.   ?    .03M
   4.   ?    .04M
   5.   ?    .05M

8. Which of the following is a halogen displacement reaction?

   1.   ?    2KBr_(aq) + Cl_2(g) -> 2KCl_(aq) + Br_2(l)
   2.   ?    2Na_(s) + 2H₂O_(l) -> 2NaOH_(aq) + H_2(g)
   3.   ?    CaBr_2(aq) + H₂SO_4(aq) -> CaSO_4(s) + 2HBr_(g)
   4.   ?    2KNO_3(s) -> 2KNO_2(s) + O_2(g)
   5.   ?    2LiOH_(aq) + H₂SO_4(aq) -> Li₂SO_4(aq) + 2H₂O_(l)

9. Which one of the following is classified as a Bronsted base?

   1.   ?    HCl
   2.   ?    HClO₄
   3.   ?    H₂SO₄
   4.   ?    HSO₄^-

10. What is the molarity of the final solution when 25mL of .5M HCl is combined with 75mL of .1M HCl?

    1.   ?    .2M
    2.   ?    .4M
    3.   ?    .6M
    4.   ?    .8M

11. Determine the final molarity of a solution formed from combining 200.mL of .050M NaCl with 350.mL of .020M NaCl.

    1.   ?    .025M
    2.   ?    .055M
    3.   ?    .070M
    4.   ?    .031M

12. When the following reaction in acidic solution is balanced
    BrO₃^- + Br^- --> Br₂
    the coefficient in front of the bromine molecule is

    1.   ?    1
    2.   ?    2
    3.   ?    3
    4.   ?    4