FINAL EXAM CHEM 1310 WS09 Key
Version #2
1. (p. 19) Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®,
boils at 56.1C. What is the boiling point in degrees Fahrenheit?
a. 101F
b. 43.4F
C. 133F
d. 69.0F
e. 159F
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Silberberg - 001 Keys... #30
2. (p. 41) Which one of the following statements about atoms and subatomic particles is correct?
a. The neutron's mass is equal to that of a proton plus an electron.
b. The proton and the neutron have identical masses.
c. An atomic nucleus contains equal numbers of protons and neutrons.
D. A neutral atom contains equal numbers of protons and electrons.
e. Rutherford discovered the atomic nucleus by bombarding gold foil with electrons.
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3. (p. 54) Which one of the following combinations of names and formulas of ions is incorrect?
A. S2- sulfate
b. Ba2+ barium
c. HCO3- bicarbonate
d. ClO4- perchlorate
e. CN- cyanide
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4. (p. 199) Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains
0.500 mol of HCl are combined and react to completion. How many liters of hydrogen gas,
measured at STP, are produced?
Mg(s) + 2HCl(aq)  MgCl2(aq) + H2(g)
a. 22.4 L of H2
b. 4.48 L of H2
C. 2.24 L of H2
d. 11.2 L of H2
e. 5.60 L of H2
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Silberberg - 005 Gases... #45
5. (p. 127) Select the classification for the following reaction.
2I-(aq) + Cl2(aq)  I2(aq) + 2Cl-(aq)
a. acid-base
B. displacement
c. precipitation
d. combination
e. decomposition
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6. (p. 77) Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O.
Determine its empirical formula.
a. H2NO3
b. HN6O16
C. H2NO2
d. HNO
e. HN16O7
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Silberberg - 003 Stoichiometry... #22
7. (p. 120) A standard solution of 0.243 M NaOH was used to determine the concentration of a
hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid,
what is the molar concentration of the acid?
a. 2.43 M
b. 0.888 M
C. 1.13 M
d. 0.0524 M
e. 2.26 M
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8. (p. sec. 1.4) In an average year the American chemical industry produces more than 9.5 million
metric tons of sodium carbonate. Over half of this is used in the manufacture of glass while
another third is used in the production of detergents and other chemicals. How many pounds of
sodium carbonate are produced annually?
A. 2.1  1010 lb
b. 4.3  109 lb
c. 2.1  104 lb
d. 2.2  106 lb
e. 1.1  107 lb
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Silberberg - 001 Keys... #14
9. (p. 197) Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to
zinc. A sample of 195 mL of hydrogen was collected over water at 25C and 753 torr. What
mass of hydrogen was collected? (Pwater = 24 torr at 25C)
a. 0.0164 g
b. 0.00765 g
c. 0.0159 g
D. 0.0154 g
e. 0.159 g
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Silberberg - 005 Gases... #47
10. (p. 94) Methanol (CH4O) is converted to bromomethane (CH3Br) as follows:
CH4O + HBr  CH3Br + H2O
If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr,
what is the percentage yield?
a. 245%
b. 100.%
c. 40.9%
d. 121%
E. 82.6%
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Silberberg - 003 Stoichiometry... #53
11. (p. 82) Balance the following equation:
C8H18O3(l) + O2(g)  H2O(g) + CO2(g)
a. 2C8H18O3(l) + 22O2(g)  9H2O(g) + 16CO2(g)
b. C8H18O3(l) + 8O2(g)  9H2O(g) + 8CO2(g)
C. C8H18O3(l) + 11O2(g)  9H2O(g) + 8CO2(g)
d. 2C8H18O3(l) + 17O2(g)  18H2O(g) + 16CO2(g)
e. C8H18O3(l) + 13O2(g)  18H2O(g) + 8CO2(g)
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Silberberg - 003 Stoichiometry... #34
12. (p. 44) Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the
modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si.
Calculate the atomic mass of silicon.
Isotope Isotopic Mass (amu)
28Si
27.976927
29Si
28.976495
30Si
29.973770
Abundance %
92.23
4.67
3.10
A. 28.0855 amu
b. 29.2252 amu
c. 28.7260 amu
d. 28.9757 amu
e. 27.9801 amu
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13. (p. sec. 1.4) Which of the following represents the largest volume?
a. 1000 pL
b. 10,000 µL
c. 10 nL
D. 100 mL
e. 10 cm3
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14. (p. 125) The oxidation numbers of P, S and Cl in H2PO2-, H2S and KClO4 are, respectively
A. +1, -2, +7
b. -1, -2, +3
c. -1, -2, +7
d. -1, -1, +3
e. +1, +2, +7
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15. (p. 54) Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes.
What is its formula?
A. FeCl3·6H2O
b. FeCl3(H2O)6
c. Fe3Cl·6H2O
d. Fe3Cl(H2O)6
e. Fe(Cl·6H2O)3
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16. (p. 163) Select the gas with the highest average kinetic energy per mole at 298 K.
a. H2
b. H2O
c. CO2
d. O2
E. All have the same average kinetic energy.
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Silberberg - 005 Gases... #57
17. (p. 96) A 0.150 M sodium chloride solution is referred to as a physiological saline solution
because it has the same concentration of salts as normal human blood. Calculate the mass of
solute needed to prepare 275.0 mL of a physiological saline solution.
a. 31.9 g
b. 8.77 g
c. 16.1 g
D. 2.41 g
e. 41.3 g
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Silberberg - 003 Stoichiometry... #54
18. (p. 98) How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of
NaHCO3 (
= 84.02 g/mol)?
HCl(aq) + NaHCO3(s)  NaCl(s) + H2O(l) + CO2(g)
a. 638 mL
b. 572 mL
c. 276 mL
D. 175 mL
e. 536 mL
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19. (p. 23) Select the answer with the correct number of decimal places for the following sum:
a. 269.0186 cm
b. 269.019 cm
c. 269.02 cm
D. 269.0 cm
e. 269.01860 cm
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Silberberg - 001 Keys... #37
20. (p. 57) What is the name of P4Se3?
a. phosphoric selenide
b. phosphorus selenide
C. tetraphosphorus triselenide
d. phosphorus triselenide
e. tetraphosphorus selenide
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21. (p. 154) A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0C and
1.00 atm. What is the molar mass of the gas?
a. 7.76 g/mol
b. 66.1 g/mol
c. 81.4 g/mol
d. 144 g/mol
E. 74.0 g/mol
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Silberberg - 005 Gases... #37
22. (p. 23) The appropriate number of significant figures in the result of 15.234  15.208 is
a. 2
b. 4
c. 6
d. 3
E. 5
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Silberberg - 001 Keys... #38
23. (p. 116) Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous
sodium sulfate.
a. Pb2SO4
b. NaNO3
C. PbSO4
d. PbS
e. Na2NO3
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24. (p. 148) Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8
L at 75.0C and 41.1 kPa.
a. 85.1C
b. 95.0C
c. 72.9C
d. 77.2C
E. 65.2C
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Silberberg - 005 Gases... #30
25. (p. 166) At moderate pressures (~ 200 atm), the measured pressure exerted by CO2 gas is less
than that predicted by the ideal gas equation. This is mainly because
a. gas phase collisions prevent CO2 molecules from colliding with the walls of the container.
b. CO2 will condense to a liquid at 200 atm pressure.
c. such high pressures cannot be accurately measured.
D. of attractive intermolecular forces between CO2 molecules.
e. the volume occupied by the CO2 molecules themselves becomes significant.
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Silberberg - 005 Gases... #64
26. (p. 125) Which one of the following is not a redox reaction?
a. N2(g) + 3H2(g)  2NH3(g)
B. BaCl2(aq) + K2CrO4(aq)  BaCrO4(aq) + 2KCl(aq)
c. 2Al(s) + Fe2O3(s)  Al2O3(s) + 2Fe(s)
d. 2H2O(g)  2H2(g) + O2(g)
e. 2H2O2(aq)  2H2O(l) + O2(g)
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27. (p. sec. 1.4) The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.
A. 1140. cm2
b. 69.57 cm2
c. 448.8 cm2
d. 27.39 cm2
e. 96.8 cm2
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Silberberg - 001 Keys... #17
28. (p. 116) Select the correct name and chemical formula for the precipitate that forms when the
following reactants are mixed.
CoSO4(aq) + (NH4)3PO4(aq) 
a. cobalt(III) phosphate, Co3(PO4)2
b. cobalt(II) phosphate, CoPO4
c. cobalt(III) phosphate, CoPO4
d. ammonium sulfate, (NH4)2SO4
E. cobalt(II) phosphate, Co3(PO4)2
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29. (p. 73) Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as
acid rain. Calculate the mass in grams of 3.65  1020 molecules of SO3.
a. 20.6 g
B. 4.85  10-2 g
c. 2.91  10-2 g
d. 1650 g
e. 6.06  10-4 g
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Silberberg - 003 Stoichiometry... #15
30. (p. 148) A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a
volume of 20.46 L at 123C and 1.35 atm. What would be its volume at 468C and 1.35 atm?
a. 19.0 L
b. 77.9 L
C. 38.3 L
d. 10.9 L
e. 5.38 L
Difficulty: M
Silberberg - 005 Gases... #21