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1) Which one of the following processes produces a decrease in the entropy of the
system?
A) freezing of Fe(l) into Fe(s)
B) evaporation of liquid ethanol into gaseous ethanol
C) dissolution of LiOH(s) in water
D) melting ice to form water
E) mixing of two gases into one container
2) The H-C-H bond angle in the CH4 ion is approximately ________.
A) 180
B) 120
C) 109.5
D) 60
E) 90
3) The solubility of MnSO4 monohydrate in water at 20 oC is 70.0 g per 100.0 mL of
water. A solution at 20 oC that is 4.22 M in MnSO4 monohydrate is best described as
a(n) ________ solution. The formula weight of MnSO4 monohydrate is 168.97 g/mol.
A) hydrated
B) solvated
C) saturated
D) unsaturated
E) supersaturated
4) The rate of disappearance of HBr in the gas phase reaction
2HBr (g) --> H2 (g) + Br2 (g)
is 0.190 M s-1 at 150 oC. The rate of appearance of Br2 is ________ M s-1.
A) 2.63
B) 0.095
C) 0.0361
D) 0.380
E) 0.436
5) The quantity 1.0 mg/cm2 is the same as 1.0 X ________ kg/m2.
A) 10-4
B) 102
C) 10-6
D) 10-2
E) 104
6) There are ________ protons, ________ neutrons, and ________ electrons in U+5.
A) 146, 92, 92
B) 92, 146, 87
C) 92, 146, 92
D) 92, 92, 87
E) 146, 92, 146
7) Which one of the following is an endothermic process?
A) ice melting
B) water freezing
C) boiling soup
D) Hydrochloric acid and barium hydroxide are mixed at 25 °C: the temperature
increases.
E) Both A and C
8) The correct name for HIO2 is ________.
A) hypoiodic acid
B) hydriodic acid
C) periodous acid
D) iodous acid
E) periodic acid
9) The phase diagram of a substance is shown above. The area labeled ________
indicates the liquid phase for the substance.
A) w
B) x
C) y
D) z
E) y and z
10) Calculate the kinetic energy in J of an electron moving at 6.00 x 106 m/s. The mass
of an electron is
9.11 x 10-28 g.
A) 4.98 x 10-48 J
B) 3.28 x 10-14 J
C) 1.64 x 10-17 J
D) 2.49 x 10-48 J
E) 6.56 x 10-14 J
11) Cl atoms formed via photolysis of C€Cl bonds of chlorofluorocarbons in the
stratosphere are particularly effective in destroying ozone at these altitudes because
________.
A) Cl atoms absorb UV, which generate O atoms to react with O2 to produce ozone
B) Cl atoms catalytically convert O3 to O2
C) Cl atoms stoichiometrically convert O3 to O2
D) Cl atoms react with H atoms, which catalyze conversion of O2 to O3
E) Cl atoms react with N atoms, which catalyze conversion of O2to O3
12) The molarity (M) of an aqueous solution containing 52.5 g of sucrose (C12H22O11)
in 35.5 mL of solution is ________.
A) 5.46
B) 1.48
C) 0.104
D) 4.32
E) 1.85
13) For a given reaction, S = +69.0 J/molK, and the reaction is spontaneous at
temperatures above the crossover temperature, 439 K. The value of H = ________
kJ/mol , assuming that H and S do not vary with temperature.
A) 30.3
B) -30.3
C) 1.57 x 10-4
D) -1.57 x 10-4
E) 6.36 x 10-3
14) The distance from the Earth to the Moon is approximately 240,000 miles. If a
rocket travels at a speed of 7.50 km/sec, it will take ________ days to travel between
the Earth and Moon.
A) 0.60
B) 1.7
C) 3.9
D) 7.3
E) 5.6
15) Which one of the following correctly indicates the relationship between the entropy
of a system and the number of different arrangements, W, in the system?
A) S = kW
B) S =
C) S =
D) S = k lnW
E) S = Wk
