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1) What is the coefficient of H2O when the following equation is completed and
balanced?
Ba (s) + H2O (l) →
A) 1
B) 2
C) 3
D) 5
E) Ba(s) does not react with H2O (l).
2) In the Lewis symbol for a nitrogen atom, there are ________ paired and ________
unpaired electrons.
A) two, three
B) one, three
C) three, two
D) zero, five
E) two, two
3) Which nonmetal exists as a diatomic solid?
A) bromine
B) antimony
C) phosphorus
D) iodine
E) boron
4) The name of the ionic compound (NH4)3PO4 is ________.
A) ammonium phosphate
B) nitrogen hydrogen phosphate
C) tetrammonium phosphate
D) ammonia phosphide
E) triammonium phosphate
5) 3.337 g/cm3 = ________ kg/m3
A) 3.337 X 10-9
B) 3.337 X 10-5
C) 3337
D) 0.3337
E) 333.7
6) The hybridization of the central atom in the XeF4 molecule is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2
7) A temperature of ________ K is the same as 63 °F.
A) 17
B) 276
C) 290
D) 29
E) 336
8) The reaction A (aq) --> B (aq) is first order in [A]. A solution is prepared with [A] =
1.22 M. The following data are obtained as the reaction proceeds:
The rate constant for this reaction is ________ s-1.
A) 0.23
B) 1.0
C) 0.17
D) 0.12
E) -0.12
9) The net ionic equation for the reaction between aqueous nitric acid and aqueous
sodium hydroxide is ________.
A) H+ (aq) + HNO3 (aq) + 2OH- (aq) → 2H2O (l) + NO3
- (aq)
B) HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l)
C) H+ (aq) + OH- (aq) → H2O (l)
D) HNO3 (aq) + OH- (aq) → NO3
- (aq) + H2O (l)
E) H+ (aq) + Na+ (aq) + OH- (aq) → H2O (l) + Na+ (aq)
10) A compound decomposes by a first-order process. If 17.0% of the compound
decomposes in 30 minutes, the half-life of the compound is ________.
A) 112 minutes
B) 12 minutes
C) 8 minutes
D) 223 minutes
E) 56 minutes
11) Cathode rays are deflected away from a negatively charged plate because
________.
A) they are not particles
B) they are positively charged particles
C) they are neutral particles
D) they are negatively charged particles
E) they are emitted by all matter
12) In order to produce sp2 hybrid orbitals, ________ s atomic orbital(s) and ________
p atomic orbital(s) must be mixed.
A) one, two
B) one, three
C) one, one
D) two, two
E) two, three
13) The solubility of oxygen gas in water at 25 oC and 1.0 atm pressure of oxygen is
0.041 g/L. The solubility of oxygen in water at 4.0 atm and 25 oC is ________ g/L.
A) 0.041
B) 0.014
C) 0.31
D) 0.16
E) 4.0
14) The rate constant of a first-order process that has a half-life of 3.50 min is
________ s-1.
A) 0.693
B) 1.65 x 10-2
C) 1.98
D) 0.198
E) 3.30 x10-3
15) There are ________ valence electrons in the Lewis structure of CH3Cl.
A) 14
B) 16
C) 18
D) 20
E) 22
16) Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4.
Which ions are spectator ions in the reaction?
A) Ba2+ only
B) Na+ only
C) Ba2+ and SO4
2-
D) Na+ and I-
E) SO4
2- and I-
17) The nucleus of an atom contains ________.
A) electrons
B) protons, neutrons, and electrons
C) protons and neutrons
D) protons and electrons
E) protons
18) If 3.21 mol of a gas occupies 56.2 L at 44 °C and 793 torr, 4.73 mol of this gas
occupies ________ L under these conditions.
A) 14.7
B) 61.7
C) 30.9
D) 82.8
E) 478
19) Which of the following expressions is the correct equilibrium-constant expression
for the reaction below?
HF (aq) + H2O (l) H3O+ (aq) + F- (aq)
A) [HF][H2O] / [H3O+][F-]
B) 1 / [HF]
C) [H3O+][F-] / [HF][H2O]
D) [H3O+][F-] / [HF]
E) [F-] / [HF]
20) The ideal value of i (van't Hoff factor) for Na3PO4 is:
A) 4
B) 3
C) 2
D) 1
E) 5
