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1) A combination of sand, salt, and water is an example of a ________.
A) homogeneous mixture
B) heterogeneous mixture
C) compound
D) pure substance
E) solid
2) Fuel values of hydrocarbons increase as the H/C atomic ratio increases. Which of the
following compounds has the highest fuel value?
A) C2H6
B) C2H4
C) C2H2
D) CH4
E) C6H6
3) An object measuring 0.76 decimeters will have a length of ________ centimeters.
A) 7.6
B) 0.076
C) 0.0076
D) 1100
E) 0.00076
4) Which of the following could be added to a solution of acetic acid to prepare a
buffer?
A) sodium acetate only
B) sodium acetate or sodium hydroxide
C) nitric acid only
D) hydrofluoric acid or nitric acid
E) sodium hydroxide only
5) The formula of nitrobenzene is C6H5NO2. The molecular weight of this compound is
________ amu.
A) 107.11
B) 43.03
C) 109.10
D) 123.11
E) 3.06
6) Which pair of atoms constitutes a pair of isotopes of the same element?
A) X X
B) X X
C) X X
D) X X
E) X X
7) Complexes containing metals with d10 electron configurations are typically
________.
A) violet
B) blue
C) green
D) yellow
E) colorless
8) A sample of calcium carbonate [CaCO3 (s)] absorbs 40.3 J of heat, upon which the
temperature of the sample increases from 20.8 °C to 27.3 °C. If the specific heat of
calcium carbonate is 0.82 J/g-K, what is the mass (in grams) of the sample?
A) 7.6 g
B) 5.1 g
C) -7.6 g
D) 0.13 g
E) 5.3 g
9) The hybridization of nitrogen in the molecule is ________.
A) sp
B) s2p
C) s3p
D) sp2
E) sp3
10) The Lewis structure of N2H2 shows ________.
A) a nitrogen-nitrogen triple bond
B) a nitrogen-nitrogen single bond
C) each nitrogen has one nonbonding electron pair
D) each nitrogen has two nonbonding electron pairs
E) each hydrogen has one nonbonding electron pair
11) The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the
reaction
2N2O5 (soln) --> 4NO2 (soln) + O2 (soln)
The reaction is first order and has a rate constant of 4.82 x 10-3 s-1 at 64 oC. If the
reaction is initiated with 0.072 mol in a 1.00-L vessel, how many moles remain after
151 s?
A) 0.067
B) 0.074
C) 0.035
D) 9.6
E) 1.6 x 103
12) The highest energy occupied molecular orbital in the C-C bond of the C2 molecule
is _____.
A) σ2p
B) σ*
1p
C) π2p
D) π2s
E) π*
2p
13) Which of the following are weak electrolytes?
HNO3
HF
NH3
LiBr
A) HNO3, LiBr
B) HNO3, HF, NH3, LiBr
C) HF, LiBr
D) HF, NH3
E) HNO3, NH3, LiBr
14) The concentration of A is ________ M after 40.0 s.
A) 1.3 x 10-2
B) 1.2
C) 0.17
D) 3.5 x 10-4
E) 0.025
15) What is the pH of an aqueous solution at 25.0 oC in which [H+] is 0.0015 M?
A) 6.50
B) 2.82
C) -2.82
D) -6.50
E) none of the above
