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1) The value of ΔE for a system that performs 139 kJ of work on its surroundings and
gains 54kJ of heat is ________ kJ.
A) -85
B) 193
C) 7506
D) 85
E) -193
2) The reaction of 50 mL of Cl2 gas with 50 mL of C2H4 gas via the equation:
Cl2 (g) + C2H4 (g) → C2H4Cl2 (g)
will produce a total of ________ mL of products if pressure and temperature are kept
constant.
A) 100
B) 50
C) 25
D) 125
E) 150
3) Dinitrogen tetroxide partially decomposes according to the following equilibrium:
N2O4 (g) 2NO2 (g)
A 1.000-L flask is charged with 9.20 x 10-3 mol of N2O4. At equilibrium, 5.98 x 10-3
mol of N2O4 remains. Keq for this reaction is ________.
A) 0.183
B) 0.197
C) 0.212
D) 6.94 x 10-3
E) 2.96 x 10-5
4) The reaction that forms most of the acid in acid rain is ________.
A) SO2 (g) + H2O (l) --> H2SO4 (aq)
B) SO2 (g) + H2O (l) --> H2SO3 (aq)
C) H2S (g) + 2 O2 (g) --> H2SO4 (l)
D) Cl2 (g) + H2O (l) --> HCl (aq) + HClO (aq)
E) SO3 (g) + H2O (l) --> H2SO4 (aq)
5) Calculate the kinetic energy in joules of an automobile weighing 4345 lb and
traveling at 75 mph.
(1 mile = 1.6093 km, 1lb = 453.59 g).
A) 5.5 x 105 J
B) 5.5 x 10-5 J
C) 1.1 x 106 J
D) 2.2 x 106 J
E) 2.2 x 10-6 J
6) If an object is accelerating at a rate of 25 m/s2, how fast will it be moving (in m/s)
after 1.50 min? (Assume an initial velocity of zero.)
A) 17
B) 3.6
C) 38
D) 2.3 X 103
E) 0.060
7) What is the function of the carbon fibers in a composite?
A) to provide a structure to help the epoxy resin solidify in the desired shape
B) to transmit loads evenly in all directions
C) to provide resistance to oxidation
D) to provide ultraviolet protection
E) to 'spread out" the epoxy so that it remains more flexible
8) There are ________ and ________ π bonds in the molecule.
A) 3 and 2
B) 3 and 4
C) 4 and 3
D) 2 and 3
E) 5 and 0
9) Sodium bicarbonate is reacted with concentrated hydrochloric acid at 37.0 °C and
1.00 atm. The reaction of 6.00 kg of bicarbonate with excess hydrochloric acid under
these conditions will produce ________ L of CO2.
A) 1.09 x 102
B) 2.85 x 104
C) 1.82 x 104
D) 8.70 x 102
E) 1.82 x 103
10) In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates
the use of the gas constant, R, equal to ________.
A) 0.08206 atm L mol-1K-1
B) 8.314 -Pa/mol-K
C) 62.36 L torr mol-1K-1
D) 1.987 cal mol-1K-1
E) none of the above
11) When the following equation is balanced, the coefficients are ________.
C8H18 + O2 → CO2 + H2O
A) 2, 3, 4, 4
B) 1, 4, 8, 9
C) 2, 12, 8, 9
D) 4, 4, 32, 36
E) 2, 25, 16, 18
12) Using the VSEPR model, the molecular geometry of the central atom in PCl3 is
________.
A) linear
B) trigonal planar
C) tetrahedral
D) bent
E) trigonal pyramidal
13) Thermodynamic Quantities for Selected Substances at 298.15 K (25 oC)
The value of H o for the formation of phosphorous trichloride from its constituent
elements,
P2 (g) + 3Cl2 (g) --> 2PCl3 (g)
is ________ kJ/mol
A) -288.1
B) +432.4
C) -720.5
D) +720.5
E) -432.4
14) Which reaction produces a decrease in the entropy of the system?
A) 4 NH3 (g) + 5 O2 (g) --> 4 NO (g) + 6 H2O (g)
B) Na (s) + 1/2 Cl2 (g) --> NaCl (s)
C) 2 HgO (s) --> 2 Hg (l) + O2 (g)
D) UF6 (s) --> U (s) + 3F2 (g)
E) H2O (s) --> H2O (g)
15) In which orbital does an electron in a copper atom experience the greatest effective
nuclear charge?
A) 1s
B) 4s
C) 4p
D) 4d
E) 3d
16) Which one of the following basic forces is so small that it has no chemical
significance?
A) weak nuclear force
B) strong nuclear force
C) electromagnetism
D) gravity
E) Coulomb's law
17) Which one of the following is often easily separated into its components by simple
techniques such as filtering or decanting?
A) heterogeneous mixture
B) compounds
C) homogeneous mixture
D) elements
E) solutions
18) The predominant intermolecular force in CaBr2 is ________.
A) London-dispersion forces
B) ion-dipole forces
C) ionic bonding
D) dipole-dipole forces
E) hydrogen bonding
19) A chemical reaction that releases heat to the surroundings is said to be ________
and has a ________ ΔH at constant pressure.
A) endothermic, positive
B) endothermic, negative
C) exothermic, negative
D) exothermic, positive
E) exothermic, neutral
