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1) How many equivalent resonance structures can be drawn for the molecule of SO3
without having to violate the octet rule on the sulfur atom?
A) 5
B) 2
C) 1
D) 4
E) 3
2) A pressure of 0.500 atm is the same as a pressure of ________ of mm Hg.
A) 193
B) 760.
C) 380.
D) 29.9
E) 33.0
3) Which element in group 6A is not found as the central atom in compounds with an
expanded valence shell?
A) oxygen
B) selenium
C) tellurium
D) polonium
E) sulfur
4) A catalyst can increase the rate of a reaction ________.
A) by changing the value of the frequency factor (A)
B) by increasing the overall activation energy (Ea) of the reaction
C) by lowering the activation energy of the reverse reaction
D) by providing an alternative pathway with a lower activation energy
E) All of these are ways that a catalyst might act to increase the rate of reaction.
5) The total concentration of ions in a 0.250 M solution of HCl is ________.
A) 0
B) 0.125 M
C) 0.250 M
D) 0.500 M
E) 0.750 M
6) With reference to enthalpy changes, the term standard conditions means ________.
(a) P = 1 atm
(b) some common temperature, usually 298 K
(c) V = 1 L
A) a only
B) b only
C) c only
D) a and c
E) a and b
7) This reaction is an e x ample of ________.
P + _____ --> Si
A) alpha decay
B) beta decay
C) positron decay
D) electron capture
E) gamma emission
8) An aqueous solution of ________ will produce a neutral solution.
A) LiNO3
B) NaNO2
C) KF
D) Rb2CO3
E) NH4NO3
9) Which pair of elements would you expect to exhibit the greatest similarity in their
physical and chemical properties?
A) As, Br
B) Mg, Al
C) I, At
D) Br, Kr
E) N,O
10) Of the following solutions, which has the greatest buffering capacity?
A) 0.521 M HC2H3O2 and 0.217 M NaC2H3O2
B) 0.821 M HC2H3O2 and 0.713 M NaC2H3O2
C) 0.365M HC2H3O2 and 0.497 M NaC2H3O2
D) 0.121 M HC2H3O2 and 0.116 M NaC2H3O2
11) Three monosulfur fluorides are observed: SF2, SF4, and SF6. Of these, ________
is/are polar.
A) SF2 only
B) SF2 and SF4 only
C) SF4 only
D) SF6 only
E) SF2, SF4, and SF6
12) Element M reacts with oxygen to form an oxide with the formula MO. When MO is
dissolved in water, the resulting solution is basic. Element M could be ________.
A) strontium
B) bromine
C) selenium
D) germanium
E) nitrogen
13) In the gas phase reaction below, NH3 is acting as a(n) ________ base but not as a(n)
________ base.
A) Arrhenius, Brnsted-Lowry
B) Brnsted-Lowry, Lewis
C) Lewis, Arrhenius
D) Lewis, Brnsted-Lowry
E) Arrhenius, Lewis
14) An aqueous solution of ________ will produce a basic solution.
A) Na2SO3
B) RbBr
C) Mg(ClO4)2
D) NH4NO3
E) KNO3
15) The electron-domain geometry and the molecular geometry of a molecule of the
general formula ABn are ________.
A) never the same
B) always the same
C) sometimes the same
D) not related
E) mirror images of one another
16) The partial pressure of a gas in air is 1.87 torr and its concentration is 8.57 103 ppm.
The total air pressure is ________ torr.
A) 218
B) 1.60 10-2
C) 2.18 10-4
D) 4.58 109
E) 0.218
17) In the reaction of phosphorus with chlorine to form a phosphorus chloride, whether
PCl3 or PCl5 forms depends on ________.
A) which allotropic form of phosphorus is used
B) the amount of chlorine present
C) whether the reaction is carried out in the gas phase or in solution
D) whether the chlorine used is molecular or atomic
E) the amount of moisture present
18) A geometrical isomer with like groups located on opposite sides of the metal atom
is denoted with the prefix ________.
A) cis-
B) trans-
C) bis-
D) tetrakis-
E) d-
19) 2F2 (g) + 2H2O (l) → ________
A) 2HF (aq) + 2HFO (aq)
B) 2F- (aq) + 2H+ (aq) + H2O2 (aq)
C) 4HF (aq) + O2 (g)
D) 2HF2 (aq) + 2OH- (aq)
E) 4HF (aq) + 2O2- (aq)
