Final Exam Review SI

7 December 2014

1.  What is the oxidation number on silver, in the following compound: KAuCl4

a.  - 3 b. + 2 c. + 3 d. + 7

2.  Which element is going through reduction in the following equation:

4 Zn (s) + 10 H+ (aq) + 2NO3- (aq) à 4 Zn2+ (aq) + 2N2O (g) + 5H2O (l)

a.  H+ (aq) b. Zn2+ (aq) c. Zn (s) d. N2O (g)

3.  What species is the reducing agent in the following equation:

2MnO2 (s) + KClO3 (aq) + 2KOH (aq) à 2 KMnO4 (aq) + KCl (aq) + H2O (l)

a.  K b. MnO2 c. KOH d. H2O

4.  Magnesium carbonate, MgCO3, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

a.  Mg2+ and CO32- b. Na+ and Cl- c. Mg2+ and Cl- d. Na+ and CO32-

5.  Which one of the following compounds will be insoluble in water?

a.  Na3PO4 b. CaCO3 c. MgCl2 d. AgNO3

6.  What type of reaction is the following: 2C4H10 (g) + 13O2 (g) à 8CO2 (g) +10 H2O(g)

a.  Double displacement

b.  Single displacement

c.  Combustion

d.  Combination

7.  Solid calcium carbonate is added to sulfuric acid. Bubbles are observed. What are the correct products of the reaction?

a.  CaSO4 (aq) and H2CO3 (aq)

b.  CaCO3 (s) and H2SO4 (g)

c.  CaSO4 (aq), H2O (l) and CO2 (g)

d.  No reaction

8.  An aqueous solution of sodium phosphate is added to an aqueous solution of zinc (II) nitrate. Write the balanced net ionic-equation.

9.  What is the concentration of a sulfuric acid solution, if it takes 125 mL of a .98 molar potassium hydroxide solution to neutralize 67.8 mL?

a.  .12 M b. 0.90 M c. 1.8 M c. 0.26 M

10.  What is the correct coefficient in front of O2 to balance the following equation:

__C2H6 + __O2 à __H2O + __CO2

a.  14 b. 3 c. 7 d. 6

11.  Twenty grams of lithium hydroxide combines with potassium chloride and produces 24 grams of lithium chloride, what is the percent yield?

a.  33% b. 31% b. 66% c. 110%

12.  Rank the following elements by increasing electro negativity: sulfur, oxygen, neon, and aluminum.

a.  Aluminum > neon > sulfur > oxygen

b.  Oxygen > sulfur > aluminum > neon

c.  Neon sulfur aluminum oxygen

d.  Neon aluminum < sulfur oxygen

13.  Given that the molecular formula for NutraSweet is (C14H18N2O5), what is the empirical formula?

a.  C14H18N2O5

b.  C7H9NO2.5

c.  C28H36N4O10

d.  C8H10N4O2

14.  On analysis, a compound with a molar mass of 60. g/mol was found to contain 12.0 grams of carbon, 2.0 grams of hydrogen and 16.0 grams of oxygen. What is the molecular formula?

a.  C12H2O16

b.  C2H4O2

c.  CH2O

d.  C4H8O4

15.  What is the molarity of a solution prepared by dissolving 32.0g of calcium chloride in 271 grams of water?

a.  1.06 M b. 2.12 M c. 1.19 M d. 1.07E-3

16.  A student makes several measurements of the density of an unknown mineral sample. She then reports the average value of these measurements. The number of significant figures she uses in her result should be a measure of its:

a.  Systematic error b. Determinate error c. Precision d. Accuracy

17.  What is the numerical value of 1.5 cm – 7.222 x 10-1 cm?

a.  0.7778 cm b. 0.778 cm c. 0.78 cm d. 0.8 cm

18.  At constant temperature, 12.5 L of nitrogen gas at 262 mmHg is compressed to 4.15 L. What is the final pressure of N2?

a.  789 mmHg b. 87.0 mmHg c. 0.198 mmHg d. 5.05 mmHg