1) At what speed (m/s) must a 3.0-mg object be moving in order to have a de Broglie
wavelength of
5.4 X 10-29 m?
A) 1.6 X 10-28 m/s
B) 3.9 X 10-4 m/s
C) 2.0 X 1012 m/s
D) 4.1 m/s
E) 6.3 m/s
2) There are ________ protons, ________ electrons, and ________ neutrons in an atom
of Xe.
A) 129, 129, 129
B) 129, 129, 75
C) 54, 75, 129
D) 54, 54, 75
E) 54, 54, 129
3) Which one of the following processes produces a decrease of the entropy of the
system?
A) dissolving sodium chloride in water
B) sublimation of naphthalene
C) dissolving oxygen in water
D) boiling of alcohol
E) explosion of nitroglycerine
4) In the ________ liquid crystalline phase, the component molecules are aligned along
their long axis and are arranged in layers with the molecules in each plane twisted
slightly in relation to the molecules in the planes above and below.
A) nematic
B) smectic A
C) smectic B
D) smectic C
E) cholesteric
5) The n = 2 to n = 6 transition in the Bohr hydrogen atom corresponds to the ________
of a photon with a wavelength of ________ nm.
A) emission, 410
B) absorption, 410
C) absorption, 660
D) emission, 94
E) emission, 390
6) In the nuclear transmutation represented by N( n, p)?, what is the product?
A) carbon-12
B) carbon-16
C) carbon-14
D) nitrogen-16
E) nitrogen-15
7) The correct name for H2SO4 is ________.
A) sulfuric acid
B) sulfurous acid
C) hydrosulfuric acid
D) hydrosulfic acid
E) sulfur hydroxide
8) Optically active molecules that are mirror images of each other are called ________.
A) allotropes
B) geometrical isomers
C) enantiomers
D) cofactors
E) chiral compounds
9) What is the pH of a buffer solution that is 0.266 M in lactic acid and 0.111 M in
sodium lactate? The Ka of lactic acid is 1.4 x 10-4.
A) 14.38
B) 10.53
C) 5.38
D) 3.47
E) 4.23
10) Which statement about addition reactions between alkenes and HBr is false?
A) The addition occurs at the double bond.
B) Bromine attacks the alkene carbon atom possessing a partial positive charge.
C) A hydrogen atom attaches to the alkene carbon atom possessing a partial negative
charge.
D) The € bond breaks in the course of the reaction.
E) The proposed mechanism involves radicals.
11) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of H o for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,
S (s, rhombic) + O2 (g) –> SO2 (g)
is ________ kJ/mol.
A) +269.9
B) -269.9
C) +0.00
D) -11.6
E) +11.6
12) The Lewis structure of carbon monoxide is given below. The hybridizations of the
carbon and oxygen atoms in carbon monoxide are ________ and ________,
respectively.
: C O :
A) sp, sp3
B) sp2, sp3
C) sp3, sp2
D) sp, sp
E) sp2, sp2
13) The equilibrium expression for Kp for the reaction below is ________.
N2 (g) + O2 (g) 2NO (g)
A)
B)
C)
D)
E) none of the above
14) The correct answer (reported to the proper number of significant figures) to the
following is ________.
(12.67 + 19.2)(3.99) / (1.36 + 11.366) = ________
A) 9.99851
B) 9.9985
C) 9.999
D) 1.00 X 101
E) none of the above