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1) When aqueous solutions of Pb(NO3)2 and NaCl are mixed, PbCl2 precipitates. The
balanced net ionic equation is ________.
A) Pb2+ (aq) + 2Cl- (aq) → PbCl2 (s)
B) Pb2+ (aq) + 2NO3
- (aq) → Pb(NO3)2 (s)
C) Pb2+ (aq) + 2NO3
- (aq) → Pb(NO3)2 (aq)
D) Pb(NO3)2 (aq) + 2NaCl (aq) → PbCl2 (s) + 2NaNO3 (aq)
E) Pb(NO3)2 (aq) + 2NaCl (aq) → PbCl2 (aq) + 2NaNO3 (s)
2) The concentration of HCl in a solution that is prepared by dissolving 5.5 g of HCl in
200 g of C2H6O is ________ molal.
A) 27.5
B) 7.5 x 10-4
C) 3.3 x 10-2
D) 0.75
E) 1.3
3) The overall order of a reaction is 1. The units of the rate constant for the reaction are
________.
A) M/s
B) M-1s-1
C) 1/s
D) 1/M
E) s/M2
4) The atomic number indicates ________.
A) the number of neutrons in a nucleus
B) the total number of neutrons and protons in a nucleus
C) the number of protons or electrons in a neutral atom
D) the number of atoms in 1 g of an element
E) the number of different isotopes of an element
5) According to MO theory, overlap of two p atomic orbitals produces ________.
A) one π MO and one σ* MO
B) one π MO and one σ MO
C) one π MO and one π* MO or one σ MO and one σ* MO
D) one π+ MO and one σ* MO
E) two π MOs, two π+ MOs, one σ MO, and one σ* MO
6) Round the following number to four significant figures and express the result in
standard exponential notation: 0.00222755
A) 0.2228 X 10-2
B) 0.002228
C) 2.228 X 103
D) 2.228 X 10-3
E) 22.28 X 102
7) The electron-domain geometry of ________ is tetrahedral.
A) CBr4
B) PH3
C) CCl2Br2
D) XeF4
E) all of the above except XeF4
8) There are ________ paired and ________ unpaired electrons in the Lewis symbol for
a fluorine atom.
A) 4, 2
B) 4, 1
C) 6, 1
D) 0, 5
E) 2, 5
9) A cube of an unknown metal measures 0.250 cm on one side. The mass of the cube is
0.095 g. Which of the following is most likely the unknown metal?
A) zirconium
B) rhodium
C) vanadium
D) copper
E) niobium
10) The combustion of titanium with oxygen produces titanium dioxide:
Ti (s) + O2 (g) → TiO2 (s)
When 0.610 g of titanium is combusted in a bomb calorimeter, the temperature of the
calorimeter increases from 25.00 °C to 50.50 °C. In a separate experiment, the heat
capacity of the calorimeter is measured to be 9.84 kJ/K. The heat of reaction for the
combustion of a mole of Ti in this calorimeter is ________ kJ/mol.
A) 2.09
B) 4.14
C) -311
D) -0.154
E) -1.98 x 104
11) What role did Karl Bosch play in development of the Haber-Bosch process?
A) He discovered the reaction conditions necessary for formation of ammonia.
B) He originally isolated ammonia from camel dung and found a method for purifying
it.
C) Haber was working in his lab with his instructor at the time he worked out the
process.
D) He developed the equipment necessary for industrial production of ammonia.
E) He was the German industrialist who financed the research done by Haber.
12) The primary commercial use of elemental nitrogen is in the manufacture of
________.
A) plastics
B) explosives
C) nitrogen-containing fertilizers
D) rubber
E) chlorine bleach
