Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A chemical formula for a molecular compound represents the composition of
a. | a molecule. | c. | the ions that make up the compound. | b. | an
atom. | d. | the crystal
lattice. |
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2.
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What is the formula for zinc fluoride?
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3.
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What is the formula for the compound formed by calcium ions and chloride
ions?
a. | CaCl | c. | CaCl3 | b. | Ca2Cl | d. | CaCl2 |
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4.
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What is the formula for aluminum sulfate?
a. | AlSO4 | c. | Al2(SO4)3 | b. | Al2SO4 | d. | Al(SO4)3 |
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5.
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Name the compound Fe(NO3)2.
a. | iron(II) nitrate | c. | iron(III) nitrate | b. | iron(II) nitrite | d. | iron(III)
nitride |
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6.
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What is the formula for dinitrogen trioxide?
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7.
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What is the formula for hydrochloric acid?
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8.
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What is the oxidation number of hydrogen in compounds containing metals?
a. | –1 | c. | +1 | b. | 0 | d. | the charge on the metal
ion |
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9.
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What is the oxidation number of oxygen in H2O2?
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10.
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What is the oxidation number of oxygen in CO2?
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11.
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Name the compound H2O using the Stock system.
a. | water | c. | hydrogen(I) oxide | b. | hydrogen dioxide | d. | hydrogen(II)
oxide |
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12.
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Name the compound CO2 using the Stock system.
a. | carbon(IV) oxide | c. | monocarbon dioxide | b. | carbon dioxide | d. | carbon oxide |
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13.
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What is the sum of the atomic masses of all the atoms in a formula for a
compound?
a. | molecular mass | c. | atomic mass | b. | formula mass | d. | actual mass |
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14.
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What is the formula mass of magnesium chloride, MgCl2?
a. | 46 amu | c. | 95.21 amu | b. | 59.76 amu | d. | 106.35 amu |
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15.
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The molar mass of CS2 is 76.15 g/mol. How many grams of
CS2 are present in 10.00 mol?
a. | 0.13 g | c. | 10.00 g | b. | 7.614 g | d. | 761.5 g |
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16.
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How many OH– ions are present in 3.00 mol of
Ca(OH)2?
a. | 3.00 | c. | 3.61  1024 | b. | 6.00 | d. | 2.06
 1023 |
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17.
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How many oxygen atoms are there in 0.500 mol of CO2?
a. | 6.02 
1023 | c. | 15.9994 | b. | 3.01 
1023 | d. | 11.0 |
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18.
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How many Mg2+ ions are found in 1.00 mol of MgO?
a. | 3.01  1023 | c. | 12.04 
1023 | b. | 6.02  1023 | d. | 6.02 
1025 |
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19.
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If 0.500 mol of Na+ combines with 0.500 mol of Cl–
to form NaCl, how many formula units of NaCl are present?
a. | 3.01  1023 | c. | 6.02 
1024 | b. | 6.02  1023 | d. | 1 |
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20.
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What is the percentage composition of CF4?
a. | 20% C, 80% F | c. | 16.8% C, 83.2% F | b. | 13.6% C, 86.4% F | d. | 81% C, 19% F |
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21.
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A compound contains 27.3 g of C and 72.7 g of O. What is the empirical formula
for this compound?
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22.
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To find the molecular formula from the empirical formula, one must determine the
compound's
a. | density. | c. | structural formula. | b. | formula mass. | d. | crystal
lattice. |
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23.
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The molecular formula for vitamin C is C6H8O6.
What is the empirical formula?
a. | CHO | c. | C3H4O3 | b. | CH2O | d. | C2H4O2 |
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24.
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Of the following molecular formulas for hydrocarbons, which is an empirical
formula?
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25.
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A compound's empirical formula is NO2. If the formula mass is 92
amu, what is the molecular formula?
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