Which one of the following is a strong electrolyte? a) 1.0 M glucose b) 0.50 M lithium chloride c)

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

 a) 1.0 M glucose b) 0.50 M lithium chloride c) 1.0 M acetic acid d) water e) 0.50 M ammonia

2. Which one of the following is a weak acid?

 a) HNO2 b) HClO3 c) HBr d) H2SO4 e) HCl

3. Which one of the following compounds will be water soluble?
 a) BaSO4 b) CuS c) Pb(NO3)2 d) Al(OH)3 e) ZnCO3

4. Identify the major ionic species present in an aqueous solution of barium perchlorate, Ba(ClO4)2.
 a) Ba2+, Cl–, O42– b) Ba, 2ClO4 c) Ba+, C4+, l–, O42–d) Ba2+, ClO4–e) Ba2+, ClO42–

5. The reaction between aqueous solutions of Iron(III) chloride, FeCl3 and barium hydroxide, Ba(OH)2 is best described as ____________.
a) redox reaction b) precipitation reaction c) acid-base reaction d) single displacement reaction e) decomposition reaction

6. When aqueous solutions of sodium phosphate Na3PO4(aq) and silver nitrate, AgNO3(aq) are mixed,_____________.
 a) there will be no reaction.
 b) a precipitate of AgNa would form.
 c) NO2 gas would be liberated.
 d) Na+ and NO3  ions are the spectator ions and AgNO3 would precipitate.
 e) Ag3PO4 will precipitate and Na+ and NO3 are the spectator ions.

7. What is the oxidation number of phosphorus atom in sodium dihydrogen phosphate, NaH2PO4?
a) –3 b) –5 c) +7 d) +5 e) +3

8. Which one of the following is a redox reaction?
 a) HNO3(aq) + LiOH(aq)   LiNO3(aq) + H2O(l)
 b) N2(g) + 3 H2(g) 2 NH3(g)
 c) MgO(s) + H2O(l) Mg(OH)2(aq)
 d) 2 HClO3(aq) + PbS(s) Pb(ClO3)2(aq) + H2S(g)
 e) none of the above

9. In the following redox reaction, what is being oxidized?
 Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g)
a) Zn b) HCl c) ZnCl2 d) H2 e) H+ in HCl

10. An unknown compound [Molar mass 130.0 g/mol] found to contain only carbon, nitrogen and hydrogen. A 12.50 gram sample of this compound was analyzed to contain 73.85% carbon, 21.54% nitrogen and 4.61 % Hydrogen. What is the empirical formula of this compound?
a) C3H3N2 b) C3H2N c) C4H3N d) C6H4N2 e) C8H6N2

11. How many grams of AgNO3 are needed to make 250. mL of a solution that is 0.135 M? [Molar mass of AgNO3 = 170.0 g]
a) 0.0917 g b) 0.174 g c) 5.74 g d) 19.7 g e) 91.7 g

12. What is the molar concentration of sodium ions in a 250.0 mL aqueous solution containing 16.4 g of sodium phosphate, Na3PO4. [Molar mass of Na3PO4 =164 g]
a) 0.0012 M b) 0.263 M c) 0.400 M d) 1.20 M e) 1.40 M

13. If the percent yield for the formation of HNO3 in the following reaction is 75%, and 46.0 g of NO2(g) are consumed in the reaction, how many grams of nitric acid, HNO3(aq) are produced?
 3 NO2(g) + H2O(l)   2HNO3(aq) + NO(g)

Molar masses (g/mol)
NO2                   46.0
H2O                   18.0
HNO3                63.0
NO                     30.0

a) 31.5 g b) 42.0 g c) 54.8 g d) 69.3 g e) 73.4g

14. What is the molar concentration of chloride ions Cl in a solution made by combining 10.0 mL of
0.20 M NaCl and 10.0 mL of 0.40 M CaCl2? You may assume that volumes are additive.
 a) 0.30 M b) 0.50 M c) 0.60 M d) 0.70 M e) 1.0 M

15. What is the concentration of HCl in the final solution when 65 mL of a 12 M HCl solution is diluted
with pure water to a final volume of 0.15 L?
 a) 2.82 × 10x-2 M b) 5.2 M c) 28 M d) 5.2 × 103M e) 4.2 M