2. A metal from period 4 is added to water and a vigorous reaction takes place with the
evolution of a gas. Which statements are correct?
1. Oxygen is evolved.
2. Hydrogen is evolved.
3. The resulting solution is acidic.
4. The resulting solution is basic.
(A) 1 and 3 only
(B) 2 and 3 only
(C) 2 and 4 only
(D) 1 and 4 only
3. 30.mL of 0.10 Ba(OH)2(aq) is added to 30. mL of 0.10 M H2SO4(aq)
and the solution is stirred quickly. The rise in temperature, DT1,
is measured. The experiments is repeated using 90.mL of each solution and the rise in
temperature, DT1, is measured. What is the
relationship between DT1 and DT2?
(A) DT2 is equal to DT1
(B) DT2 is three times as large as DT1
(C) DT2 is six times as large as DT1
(D) DT2 is one-third as large as DT1
4. An aqueous solution is 0.1 M in each of these ions.
Which ion(s) will precipitate if 0.1 M HCI is added?
(A) 2 only
(B) 3 only
(C) 2 and 3 only
(D) 1,2, and 3
5. The age of a wooden artifact was determined by carbon-14 dating. Three different
measurements gave values of 6925, 4815, and 5485 years. Which is the best value to report
for the age of this artifact?
(A) 5700 years
(B) 5740 years
(C) 5741 years
(D) 6000 years
6. What is the molality, m, of methanol in a solution prepared by dissolving 160
g of methanol, CH3OH, in 200.0 g of water?
(A) 1.0 m
(B) 5.0 m
(C) 10.0 m
(D) 25.0 m
7. What is the coefficient for oxygen when this equation is balanced?
Sb2S3(s) + O2(g) ---> Sb2O3(s)
8. Flourine reacts with uranium hexaflouride, UF6, as represented by this
U(s) + 3F2(g) ---> UF6(g)
How many flourine molecules are required to produce 2.0 mg of uranium hexaflouride, UF6,
from an excess of uranium? The molar mass of UF6 is 352.0 g mol¯1
(A) 3.4 x 1018
(B) 1.0 x 1019
(C) 2.0 x 1019
(D) 3.4 x 1021
9. Magnesium hydroxide, Mg(OH)2, is the white milky substance in milk of
magnesia. What mass of Mg(OH)2 is formed when 15mL of 0.18 M NaOH are combined
with 12mL of 0.14 M MgCl2? The molar mass of Mg(OH)2 is 58.3 g mol¯1
(A) 0.079 g
(B) 0.097 g
(C) 0.16 g
(D) 0.31 g
10. What is the concentration of H+ in a solution that is prepared by mixing
50.0 mL of 0.50 M HCl with 200.0 mL of 0.25 M HCl?
(A) 0.30 M
(B) 0.35 M
(C) 0.40 M
(D) 0.45 M
11. Which concentrations can be calculated if the mole fraction and density of an
aqueous solution of HCl are known?
3. percent by mass
(A) 1 only
(B) 3 only
(C) 1 and 2 only
(D) 1, 2, and 3
12. The second law of thermodynamics states that the
(A) energy of the universe is increasing.
(B) energy of the universe is constant.
(C) entropy of the universe is increasing
(D) entropy of the universe is constant.
13. Which substance is expected to have the greatest lattice enthalpy?
14. When these substances are arranged in order of increasing boiling point (lowest
boiling point first), what is the correct order?
15. The concentration of copper(II) ions in an unknown solution is determined by
comparing the absorbance of a diluted sample of the unknown with the Beer's Law Plot at a
constant wave length for several standard solutions. When a 2.0 mL sample of the unknown
copper(II) ion solution is diluted to 5.0 mL, its absorbance is 0.29. What is the
concentration of copper(II) ions in the unknown?
(A) 0.0062 M
(B) 0.012 M
(C) 0.031 M
(D) 0.078 M
16. Which values can be obtained from the information represented by the vapor pressure
curve of a liquid?
1. normal boiling point
2. normal freezing point
3. enthalpy of vaporization
(A) 1 only
(B) 1 and 2 only
(C) 1 and 3 only
(D) 1, 2, and 3
17. The enthalpy of fusion of ice is 6.02 kJ mol¯1. The heat capacity of
water is 4.18 J g¯1 °C¯1. What is the smallest number of ice
cubes at O°C, each containing one mole of water, that are needed to cool 500. g of liquid
water from 20°C to O°C?
18. As O2(l) is cooled at 1 atm pressure, it freezes to form Solid I
at 54.5 K. At a lower temperature, Solid I rearranges to Solid II, which has
a different crystal structure. Thermal measurements show that for the phase transition
Solid I to Solid II, DH= -743.1 J mol¯1
and DS = -17.0 J K¯1 mol¯1. At what
temperature are solids I and II in equilibrium?
(A) 2.06 K
(B) 31.5 K
(C) 43.7 K
(D) 53.4 K
19. What will happen to the state of a substance represented by this phase diagram when
its temperature and pressure are changed from 60°C and 0.2 atm to 40°C and 1.0 atm?
(A) liquid to solid
(B) gas to solid
(C) solid to liquid
(D) solid to gas
37. The titration curves labeled 1 and 2 were obtained by titrating equal volumes of
two different acid samples with portions of the same sodium hydroxide solution. What
conclusions can be drawn about the relative concentrations and strengths of acids 1 and 2
from these curves?
(A) The concentrations are the same but acid 1 is weaker than acid 2.
(B) The concentrations are the same but acid 1 is stronger than acid 2.
(C) Acid 1 is the same strength as acid 2, but it is less concentrated.
(D) Acid 1 is the same strength as acid 2, but it is more concentrated.
38. Some compounds that are insoluble in water dissolve in acids. Which of these
compounds is expected to be more soluble in 1.0 M HNO3 than in an equal volume
of distilled water?
(A) 2 only
(B) 1 and 3 only
(C) 2 and 3 only
(D) 1,2 and 3
39. A 0.10 M solution of fluoride ions is gradually added to a solution
containing Ba2+, Ca2+, and Pb2+ ions, each at a
concentration of 1 x 10¯3 M. In what order, from first to last, will the
precipitates of BaF2, CaF2, and PbF2 form?
41. Two aqueous solutions, one containing AgNO3 and the other X2+
ions, are electrolyzed with the same amount of current for equal times. 5.00g of Ag and
3.17g of X are deposited. What is molar mass of X?
(A) 34.3 g mol¯1
(B) 68.4 g mol¯1
(C) 137 g mol¯1
(D) 170 g mol¯1
Standard Reduction Potentials, E°
H2O2(aq) + 2H+(aq) + 2e¯ ---> 2H2O(l)
Fe3+(aq) + e¯ ---> Fe2+(aq)
Given these values of standard reduction potentials, what is the value
of E° for this reaction?
If the concentrations of the Cr2+ ion and the Co2+ ion are each
decreased by a factor of 10 in separate experiments, how do the cell voltages in the two
(A) The voltage change will be twice as great when [Cr2+] is decreased as
(B) The voltage change will be ten times as great when [Cr2+] is decreased as
(C) The voltage change will be the same in the two experiments, but different from E°.
(D) The voltages wll not be changed from E°.
44. How many electrons are gained by one mole of permanganate ions when permanganate
ions react with reducing agents in acid solution to form manganese(II) ions?
(B) 6.02 x 1023
(C) (6.02 x 1023) / 5
(D) 5 x 6.02 x 1023
45. In which pair do both species have the same electron configurations?
59. Many biologically-active compounds exist as two enantiomers (two non-superimposable
optical isomers), one of which is active while the other is not. Which of these compounds
could exist as optical isomers?
60. A four-carbon alcohol was oxidized with acidified potassium dichromate to form a
ketone. Which structure represents the original alcohol?