FINAL EXAM CHEM 1310 WS09 Key
Version #1
1. (p. 57) What is the name of P4Se3?
a. phosphoric selenide
b. tetraphosphorus selenide
c. phosphorus selenide
d. phosphorus triselenide
E. tetraphosphorus triselenide
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Silberberg - 002 The... #63
2. (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. 11.2 L of H2
c. 5.60 L of H2
D. 2.24 L of H2
e. 4.48 L of H2
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Silberberg - 005 Gases... #45
3. (p. 82) Balance the following equation:
C8H18O3(l) + O2(g)  H2O(g) + CO2(g)
A. C8H18O3(l) + 11O2(g)  9H2O(g) + 8CO2(g)
b. C8H18O3(l) + 13O2(g)  18H2O(g) + 8CO2(g)
c. 2C8H18O3(l) + 22O2(g)  9H2O(g) + 16CO2(g)
d. C8H18O3(l) + 8O2(g)  9H2O(g) + 8CO2(g)
e. 2C8H18O3(l) + 17O2(g)  18H2O(g) + 16CO2(g)
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Silberberg - 003 Stoichiometry... #34
4. (p. 127) Select the classification for the following reaction.
2I-(aq) + Cl2(aq)  I2(aq) + 2Cl-(aq)
a. acid-base
b. combination
c. precipitation
D. displacement
e. decomposition
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Silberberg - 004 The... #60
5. (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. 28.9757 amu
c. 27.9801 amu
d. 28.7260 amu
e. 29.2252 amu
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Silberberg - 002 The... #14
6. (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. 1.13 M
b. 2.26 M
c. 2.43 M
d. 0.888 M
e. 0.0524 M
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Silberberg - 004 The... #30
7. (p. sec. 1.4) Which of the following represents the largest volume?
a. 10 nL
B. 100 mL
c. 10 cm3
d. 10,000 µL
e. 1000 pL
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Silberberg - 001 Keys... #12
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. 4.3  109 lb
b. 1.1  107 lb
C. 2.1  1010 lb
d. 2.2  106 lb
e. 2.1  104 lb
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Silberberg - 001 Keys... #14
9. (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. 121%
b. 40.9%
C. 82.6%
d. 100.%
e. 245%
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Silberberg - 003 Stoichiometry... #53
10. (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. CO2 will condense to a liquid at 200 atm pressure.
b. the volume occupied by the CO2 molecules themselves becomes significant.
c. gas phase collisions prevent CO2 molecules from colliding with the walls of the container.
D. of attractive intermolecular forces between CO2 molecules.
e. such high pressures cannot be accurately measured.
Difficulty: M
Silberberg - 005 Gases... #64
11. (p. 116) Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous
sodium sulfate.
a. Pb2SO4
b. NaNO3
c. PbS
D. PbSO4
e. Na2NO3
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Silberberg - 004 The... #19
12. (p. 23) Select the answer with the correct number of decimal places for the following sum:
a. 269.01860 cm
b. 269.0186 cm
c. 269.019 cm
D. 269.0 cm
e. 269.02 cm
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Silberberg - 001 Keys... #37
13. (p. 163) Select the gas with the highest average kinetic energy per mole at 298 K.
A. All have the same average kinetic energy.
b. CO2
c. H2
d. O2
e. H2O
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Silberberg - 005 Gases... #57
14. (p. 125) Which one of the following is not a redox reaction?
a. N2(g) + 3H2(g)  2NH3(g)
b. 2Al(s) + Fe2O3(s)  Al2O3(s) + 2Fe(s)
c. 2H2O2(aq)  2H2O(l) + O2(g)
D. BaCl2(aq) + K2CrO4(aq)  BaCrO4(aq) + 2KCl(aq)
e. 2H2O(g)  2H2(g) + O2(g)
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Silberberg - 004 The... #42
15. (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. 0.00765 g
b. 0.0159 g
c. 0.0164 g
d. 0.159 g
E. 0.0154 g
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Silberberg - 005 Gases... #47
16. (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. 72.9C
B. 65.2C
c. 85.1C
d. 77.2C
e. 95.0C
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Silberberg - 005 Gases... #30
17. (p. 125) The oxidation numbers of P, S and Cl in H2PO2-, H2S and KClO4 are, respectively
a. -1, -2, +7
B. +1, -2, +7
c. -1, -2, +3
d. +1, +2, +7
e. -1, -1, +3
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Silberberg - 004 The... #38
18. (p. 77) Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O.
Determine its empirical formula.
a. HNO
b. HN16O7
c. H2NO3
D. H2NO2
e. HN6O16
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Silberberg - 003 Stoichiometry... #22
19. (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. 5.38 L
B. 38.3 L
c. 19.0 L
d. 10.9 L
e. 77.9 L
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Silberberg - 005 Gases... #21
20. (p. 54) Iron (III) chloride hexahydrate is used as a coagulant for sewage and industrial wastes.
What is its formula?
a. Fe3Cl·6H2O
b. Fe3Cl(H2O)6
c. FeCl3(H2O)6
d. Fe(Cl·6H2O)3
E. FeCl3·6H2O
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Silberberg - 002 The... #51
21. (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. 41.3 g
B. 2.41 g
c. 8.77 g
d. 16.1 g
e. 31.9 g
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Silberberg - 003 Stoichiometry... #54
22. (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(III) phosphate, CoPO4
C. cobalt(II) phosphate, Co3(PO4)2
d. ammonium sulfate, (NH4)2SO4
e. cobalt(II) phosphate, CoPO4
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Silberberg - 004 The... #21
23. (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. 276 mL
b. 572 mL
C. 175 mL
d. 638 mL
e. 536 mL
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Silberberg - 003 Stoichiometry... #65
24. (p. 23) The appropriate number of significant figures in the result of 15.234  15.208 is
a. 3
b. 6
c. 2
d. 4
E. 5
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Silberberg - 001 Keys... #38
25. (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. 133F
b. 159F
c. 43.4F
d. 69.0F
e. 101F
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Silberberg - 001 Keys... #30
26. (p. sec. 1.4) The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.
a. 27.39 cm2
b. 69.57 cm2
C. 1140. cm2
d. 448.8 cm2
e. 96.8 cm2
Difficulty: M
Silberberg - 001 Keys... #17
27. (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. 144 g/mol
b. 66.1 g/mol
c. 7.76 g/mol
D. 74.0 g/mol
e. 81.4 g/mol
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Silberberg - 005 Gases... #37
28. (p. 41) Which one of the following statements about atoms and subatomic particles is correct?
a. An atomic nucleus contains equal numbers of protons and neutrons.
b. The proton and the neutron have identical masses.
c. Rutherford discovered the atomic nucleus by bombarding gold foil with electrons.
D. A neutral atom contains equal numbers of protons and electrons.
e. The neutron's mass is equal to that of a proton plus an electron.
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Silberberg - 002 The... #10
29. (p. 54) Which one of the following combinations of names and formulas of ions is incorrect?
a. ClO4- perchlorate
b. Ba2+ barium
c. HCO3- bicarbonate
D. S2- sulfate
e. CN- cyanide
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Silberberg - 002 The... #35
30. (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. 4.85  10-2 g
b. 2.91  10-2 g
c. 20.6 g
d. 1650 g
e. 6.06  10-4 g
Difficulty: M
Silberberg - 003 Stoichiometry... #15