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1) Consider the following reaction:
A --> 2C
The average rate of appearance of C is given by [C]/t. Comparing the rate of
appearance of C and the rate of disappearance of A, we get [C]/t = ________ x (-[A]/t).
A) +2
B) -1
C) +1
D) +1/2
E) -1/2
2) Of the units below, ________ are appropriate for a third-order reaction rate constant.
A) M-2s-1
B) M s-1
C) s-1
D) M-1s-1
E) mol/L
3) What is the molecular formula for propane?
A) C2H8
B) C3H6
C) C3H8
D) C4H8
E) C4H10
4) Which of the following statements is (are) false?
A) The greater the energy gap in a metal complex, the shorter the wavelength of light
the complex will absorb.
B) Complex color depends on both the metal and the ligand.
C) Metal complexes with an ammonia ligand have a larger energy gap than the
corresponding fluoride complexes.
D) Strong field ligands are associated with low energy gaps.
E) Both A and C
5) When the following equation is balanced, the coefficient of hydrogen is ________.
K (s) + H2O (l) → KOH (aq) + H2 (g)
A) 1
B) 2
C) 3
D) 4
E) 5
6) The sp3d2 atomic hybrid orbital set accommodates ________ electron domains.
A) 2
B) 3
C) 4
D) 5
E) 6
7) The Kb of ammonia is 1.76 x 10-5. The pH of a buffer prepared by combining 50.0
mL of 1.00 M ammonia and 45.0 mL of 1.00 M ammonium nitrate is ________.
A) 4.632
B) 9.291
C) 4.742
D) 9.372
E) none of the above
8) The concentration of iodide ions in a saturated solution of silver iodide is ________
M. The solubility product constant of AgI is 8.3 x 10-17.
A) 3.8 x 10-11
B) 3.0 x 10-10
C) 9.1 x 10-9
D) 3.5 x 10-9
E) 1.4 x 10-8
9) The rate constant for a particular second-order reaction is 0.47 M-1s-1. If the initial
concentration of reactant is 0.25 mol/L, it takes ________ s for the concentration to
decrease to 0.20 mol/L.
A) 2.1
B) 1.4
C) 1.0
D) 0.47
E) 0.20
10) Aluminum reacts with a certain nonmetallic element to form a compound with the
general formula AlX. Element X is a diatomic gas at room temperature. Element X
must be ________.
A) oxygen
B) fluorine
C) chlorine
D) nitrogen
E) sulfur
11) What are the respective central-metal oxidation state, coordination number, and
overall charge on the complex ion in
Na2[Cr(NH3)2 (NCS)4]?
A) +3; 6; -1
B) +3; 6; +1
C) +2; 6; -2
D) +2; 4; -1
E) +1; 6; -2
