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1) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of S o for the decomposition of gaseous sulfur trioxide to solid elemental
sulfur and gaseous oxygen,
2SO3 (g) --> 2S (s, rhombic) + 3O2 (g)
is ________ J/K mol.
A) +19.3
B) -19.3
C) +493.1
D) +166.4
E) -493.1
2) When the following equation is balanced, the coefficient of HNO3 is ________.
HNO3 (aq) + CaCO3 (s) → Ca(NO3)2 (aq) + CO2 (g) + H2O (l)
A) 1
B) 2
C) 3
D) 5
E) 4
3) The electron configuration of the phosphide ion (P3-) is ________.
A) [Ne]3s2
B) [Ne]3s23p1
C) [Ne]3s23p3
D) [Ne]3p2
E) [Ne]3s23p6
4) If the partial pressure of oxygen in the air a diver breathes is too great, ________.
A) respiratory tissue is damaged by oxidation
B) hyperventilation results
C) the urge to breathe is increased and excessive CO2 is removed from the body
D) the urge to breathe is reduced and not enough CO2 is removed from the body
E) No problems result from this situation.
5) How many d electrons are associated with the metal ion in [Cr(NH3)6]3+?
A) 3
B) 4
C) 2
D) 1
E) 0
6) The half-life of carbon-11 is 20.3 minutes. How much of a 100.0 mg sample remains
after 1.50 hours?
A) 8.48 mg
B) 4.63 mg
C) 12.9 mg
D) 22.6 mg
E) 7.70 mg
7) A first-order reaction has a rate constant of 0.33 min-1. It takes ________ min for the
reactant concentration to decrease from 0.13 M to 0.066 M.
A) 0.085
B) 0.13
C) 0.89
D) 2.4
E) 2.1
8) An object measuring 25.0 inches will have a length of ________ centimeters.
A) 63.5
B) 9.84
C) 0.0158
D) 0.102
E) 2.54
9) Which one of the following can be done to shorten the half-life of the radioactive
decay of uranium-238?
A) freeze it
B) heat it
C) convert it to UF6
D) o x idize it to the +2 o x idation state
E) none of the above
10) The pH of a solution prepared by dissolving 0.350 mol of solid dimethylamine
hydrochloride ((CH3)2NH2Cl) in 1.00 L of 1.10 M dimethylamine ((CH3)2NH) is
________. The Kb for methylamine is 5.40 x 10-4. (Assume the final volume is 1.00 L.)
A) 1.66
B) 2.77
C) 11.23
D) 11.14
E) none of the above
11) The formula weight of a substance is ________.
A) identical to the molar mass
B) the same as the percent by mass weight
C) determined by combustion analysis
D) the sum of the atomic weights of each atom in its chemical formula
E) the weight of a sample of the substance
