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The Lewis structure for H3BO3is
A)
B)
C)
D)
E)
Which of the following electron distributions among the molecular orbitals best
describes the NO molecule?
A)2 2 4 2 4 2
B)2 2 4 2 4 1
C)2 2 4 1 3 0
D)2 2 4 2 2 0
E)2 2 4 2 1 0
Consider the reaction, 3 A + 5 B 4 C + 7 D. If C is being produced at a rate of 2.43
mol/L s, at what rate is [A] decreasing?
A)1.82 mol/L s
B)3.24 mol/L s
C)3.6 mol/L s
D)-1.82 mol/L s
E)2.43 mol/L s
Calculate the value of DH° for the reaction C2H6+ 2 Cl2® C2H4Cl2+ 2 HCl given the
bond energies (kJ/mol):
H-H 432 kJ/mol
C-H 314 kJ/mol
H-Cl 427 kJ/mol
C-C 347 kJ/mol
Cl-Cl 243 kJ/mol
C-Cl 339 kJ/mol
A)-209 kJ
B)-418 kJ
C)+318kJ
D)-318 kJ
E)-518 kJ
What will be the pressure of a sample of 48.0 grams of oxygen gas in a glass container
of volume 5.2 L at 25 °C?
A)0.591 atm
B)1.18 atm
C)7.05 atm
D)14.1 atm
E)226 atm
In which of the following pairs is the substance with the HIGHER entropy listed first?
I. NaCl(s), NaCl(aq)
II. CO(g), CO2(g)
III. 1 mole of H2(g) at 25°C; 1 mole of H2(g) at 50°C
A) I only
B) II only
C) III only
D) all of them
E) none of them
Substance X has a heat of vaporization of 55.9kJ/mol at its normal boiling point
(423°C). For the process X(l) --> X(g) at 1 atm and 423°C calculate the value of
Suniv.
A) 0
B) 80.3 J/K mol
C) 132 J/K mol
D) -80.3 J/K mol
E) -132 J/K mol
Which ion is larger in each pair? i) O2-or S2-ii) Fe2+or Fe3+iii) S2-or K+
A)S2-, Fe2+, S2-
B)S2-, Fe3+, S2-
C)O2-, Fe3+, K+
D)S2-, Fe2+, K+
E)O2-, Fe2+, S2-
Consider the skeletal structure shown below:
N—C—C—N
Draw the Lewis structure and answer the following:
How many of the atoms are sp hybridized?
A)0
B)1
C)2
D)3
E)4
A general reaction written as A + 2B --> C + 2D is studied and yields the following
data:
What is the overall order of the reaction?
A)0
B)1
C)2
D)3
E)4
Which of the following elements has the highest density?
A) Hg
B) W
C) Ta
D) Au
E) Ir
The statement that the first ionization energy for an oxygen atom is lower than the first
ionization energy for a nitrogen atom is
A)consistent with the general trend relating changes in ionization energy across a period
from left to right, because it is easier to take an electron from an oxygen atom than from
a nitrogen atom
B)consistent with the general trend relating changes in ionization energy across a period
from left to right, because it is harder to take an electron from an oxygen atom than
from a nitrogen atom
C)inconsistent with the general trend relating changes in ionization energy across a
period from left to right, due to the fact that the oxygen atom has two doubly-occupied
2p orbitals and nitrogen has only one
D)inconsistent with the general trend relating changes in ionization energy across a
period from left to right, due to the fact that oxygen has one doubly-occupied 2p orbital
and nitrogen does not
E)incorrect
Consider the molecule and the following hybridization choices:
What is the hybridization of the oxygen atom?
A)sp
B)sp2
C)sp3
D)dsp3
E)d2sp3
Which among the following represent a set of isotopes? Atomic nuclei containing:
I.20 protons and 20 neutrons
II.21 protons and 19 neutrons
III.22 neutrons and 18 protons
IV.20 protons and 22 neutrons
V.21 protons and 20 neutrons
A)I, II, III
B)III, IV
C)I, V
D)I, IV and II, V
E)No isotopes are indicated.
Convert: -48.2°C = ____________ °F.
A)-86.8°F
B)-119°F
C)-54.8°F
D)119°F
E)
