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1) CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The
total pressure in the container was ________ atm.
A) 10.3
B) 4.02
C) 6.31
D) 0.292
E) 1.60
2) What are the spectator ions in the reaction between KCl (aq) and AgNO3 (aq)?
A) K+ and Ag+
B) Ag+ and Cl-
C) K+ and NO3
-
D) Ag+ and NO3
-
E) K+ only
3) The acid-dissociation constant, Ka, for gallic acid is 4.57 x 10-3. What is the
base-dissociation constant, Kb, for the gallate ion?
A) 4.57 x 10-3
B) 2.19 x 10-12
C) 5.43 x 10-5
D) 7.81 x 10-6
E) 2.19 x 102
4) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of H o for the formation of POCl3 from its constituent elements,
P2 (g) + O2 (g) + 3Cl2 (g) --> 2POCl3 (g)
is ________ kJ/mol.
A) -1228.7
B) -397.7
C) -686.5
D) +1228.7
E) +686.5
5) Boric oxide is ________.
A) B2O
B) BO2
C) BO
D) B2O3
E) B2O4
6) In which of the following aqueous solutions would you expect AgF to have the
lowest solubility?
A) 0.030 M LiF
B) pure water
C) 0.023 M NaF
D) 0.015 M KF
E) 0.0075 M AgNO3
7) The correct formula for molybdenum (IV) hypochlorite is ________.
A) Mo(ClO3)4
B) Mo(ClO)4
C) Mo(ClO2)4
D) Mo(ClO4)4
E) MoCl4
8) The combustion of ethylene proceeds by the reaction
C2H4 (g) + 3O2 (g) --> 2CO2 (g) + 2H2O (g)
When the rate of disappearance of O2 is 0.13 M s-1, the rate of disappearance of C2H4
is ________ M s-1.
A) 0.087
B) 0.043
C) 0.39
D) 0.20
E) 0.26
9) What percentage of electricity generated in the U.S. is from commercial nuclear
plants?
A) 1%
B) 10%
C) 19%
D) 50%
E) 90%
10) The ion with the largest diameter is ________.
A) Po2-
B) S2-
C) Se2-
D) Te2-
E) O2-
11) A temperature of 10.00 °C is the same as ________ °F.
A) 50.00
B) 32.18
C) -12.22
D) 283.15
E) -263.15
12) When the following equation is balanced, the coefficient of dinitrogen pentoxide is
________.
N2O5 (g) + H2O (l) → HNO3 (aq)
A) 1
B) 2
C) 3
D) 4
E) 5
13) A sample of O2 gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take
________ s for the same amount of CO2 to effuse under the same conditions.
A) 4.3
B) 0.23
C) 3.6
D) 5.9
E) 6.9
14) A solution is prepared by adding 40.00 g of lactose (milk sugar) to 110.0 g of water
at 55 oC The partial pressure of water above the solution is ________ torr. The vapor
pressure of pure water at 55 oC is 118.0 torr. The MW of lactose is 342.3 g/mol.
A) 2.216
B) 125.5
C) 225.9
D) 115.8
E) 86.5
15) At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile
(CH3CN):
CH3NC (g) --> CH3CN (g)
At the start of the experiment, there are 0.200 mol of reactant (CH3NC) and 0 mol of
product (CH3CN) in the reaction vessel. After 25 min of reaction, 0.108 mol of reactant
(CH3NC) remain. The average rate of decomposition of methyl isonitrile, CH3NC, in
this 25 min period is ________ mol/min.
A) 3.7 x 10-3
B) 0.092
C) 2.3
D) 4.3 x 10-3
E) 0.54
16) The oxide of which of the following metals should have the greatest lattice energy?
A) calcium
B) strontium
C) magnesium
D) beryllium
E) barium
17) Screening of the nuclear charge by core electrons in atoms is ________.
A) less efficient than that by valence electrons
B) more efficient than that by valence electrons
C) essentially identical to that by valence electrons
D) responsible for a general decrease in atomic radius going down a group
E) both essentially identical to that by valence electrons and responsible for a general
decrease in atomic radius going down a group
18) Using the table of bond dissociation energies, the H for the following gas-phase
reaction is ________ kJ.
A) 291
B) 2017
C) -57
D) -356
E) -291
19) Given the following reaction at equilibrium, if Kc = 5.84 x 105 at 230.0 oC, Kp =
________.
2NO (g) + O2 (g) 2NO2 (g)
A) 3.67 x 10-2
B) 1.41 x 104
C) 6.44 x 105
D) 2.40 x 106
E) 2.41 x 107
