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1) Determine the freezing point (oC) of a 0.015 molal aqueous solution of MgSO4.
Assume i = 2.0 for MgSO4. The molal freezing-point-depression constant of water is
1.86 oC/m.
A) -0.056
B) -0.028
C) -0.17
D) -0.084
E) 0.000
2) A 4.50-g sample of liquid water at 25.0 °C is heated by the addition of 133 J of
energy. The final temperature of the water is ________ °C. The specific heat capacity of
liquid water is 4.18 J/g-K.
A) 149
B) 25.1
C) -17.9
D) 32.1
E) 7.07
3) CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The
partial pressure of CO in the container was ________ atm.
A) 6.29
B) 4.02
C) 10.3
D) 0.292
E) 1.60
4) Which of the following would produce the most strongly acidic aqueous solution?
A) HCO3
-
B) CO
C) CO2
D) CO3
2-
E) CaCO3
5) Based on molecular orbital theory, there is/are ________ unpaired electron(s) in the
OF+ ion.
A) 0
B) 3
C) 1
D) 2
E) 1/2
6) Which of the following would produce the most strongly basic aqueous solution?
A) CO
B) CO3
2-
C) CO2
D) HCO3
-
E) NaHCO3
7) The half-life of 218Po is 3.1 minutes. How much of a 155 gram sample remains after
0.40 hours?
A) 0.00067 g
B) 0.0072 g
C) 0.72 g
D) 0.0047 g
E) none of the above
8) Based on the following information, which compound has the strongest
intermolecular forces?
A) Argon
B) Benzene
C) Ethanol
D) Water
E) Methane
9) Additives can be used in soda-lime glass to alter its ________.
A) ability to withstand temperature change
B) color
C) hardness
D) melting point
E) any of the above
10) The base-dissociation constant, Kb, for pyridine, C5H5N, is 1.4 x 10-9. The
acid-dissociation constant, Ka, for the pyridinium ion, C5H5NH+, is ________.
A) 1.0 x 10-7
B) 1.4 x 10-23
C) 7.1 x 10-4
D) 1.4 x 10-5
E) 7.1 x 10-6
11) Of the molecules below, only ________ is nonpolar.
A) PF3
B) Br2S
C) TeCl2
D) HCl
E) BeH2
12) When solutions of strong electrolytes in water are formed, the ions are surrounded
by water molecules. These interactions are described as a case of ________.
A) hydration
B) supersaturation
C) crystallization
D) dehydration
E) saturation
13) Alpha decay produces a new nucleus whose ________ than those respectively of
the original nucleus.
A) atomic number is 2 less and mass number is 2 less
B) atomic number is 1 less and mass number is 2 less
C) atomic number is 2 less and mass number is 4 less
D) atomic number is 2 more and mass number is 4 more
E) atomic number is 2 more and mass number is 2 less
