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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How many atoms of fluorine are present in a molecule of carbon tetrafluoride,
CF4?
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3.
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The formula for carbon dioxide, CO2, can represent
a. | one molecule of carbon dioxide. | b. | 1 mol of carbon dioxide
molecules. | c. | the combination of 1 atom of carbon and 2 atoms of oxygen. | d. | all of the
above. |
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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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What is the formula for barium hydroxide?
a. | BaOH | c. | Ba(OH)2 | b. | BaOH2 | d. | Ba(OH) |
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6.
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Name the compound Zn3(PO4)2.
a. | zinc potassium oxide | c. | zinc phosphate | b. | trizinc polyoxide | d. | zinc phosphite |
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7.
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Name the compound Al2S3.
a. | aluminum sulfate | c. | aluminum(II) sulfate | b. | aluminum sulfur | d. | aluminum
sulfide |
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8.
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Name the compound SiO2.
a. | silver oxide | c. | silicon dioxide | b. | silicon oxide | d. | monosilver
dioxide |
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9.
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Name the compound SO3.
a. | sulfur trioxide | c. | selenium trioxide | b. | silver trioxide | d. | sodium trioxide |
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10.
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What is the formula for dinitrogen trioxide?
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11.
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What is the formula for sulfur dichloride?
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12.
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The oxidation number of fluorine is
a. | always 0. | b. | –1 in all compounds. | c. | +1 in all
compounds. | d. | equal to the negative charge of all the metal ions in a
compound. |
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13.
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What is the oxidation number of oxygen in most compounds?
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14.
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In a compound, the algebraic sum of the oxidation numbers of all atoms
equals
a. | 0. | c. | 8. | b. | 1. | d. | the charge on the
compound. |
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15.
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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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16.
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In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is
equal to
a. | 0. | c. | 10. | b. | the number of atoms in the
ion. | d. | the charge of the
ion. |
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17.
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What is the oxidation number of hydrogen in H2O?
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18.
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Name the compound N2O2 using the Stock system.
a. | dinitrogen monoxide | c. | nitrogen(II) oxide | b. | nitrogen dioxide | d. | nitrogen
oxide(II) |
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19.
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Name the compound SO2 using the Stock system.
a. | sulfur(II) oxide | c. | sulfur dioxide | b. | sulfur(IV) oxide | d. | sulfur oxide |
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20.
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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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21.
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The molar mass of an element is the mass of one
a. | atom of the element. | c. | gram of the element. | b. | crystal of the element. | d. | mole of the
element. |
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22.
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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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23.
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What is the formula mass of ethyl alcohol, C2H5OH?
a. | 30.33 amu | c. | 45.06 amu | b. | 33.27 amu | d. | 46.08 amu |
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24.
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The molar mass of MgI2 is
a. | the sum of the masses of 1 mol of Mg and 2 mol of I. | b. | the sum of the
masses of 1 mol of Mg and 1 mol of I. | c. | the sum of the masses of 1 atom of Mg and 2
atoms of I. | d. | the sum of the masses of 1 atom of Mg and 1 atom of
I. |
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25.
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The molar mass of H2O is 18.02 g/mol. How many grams of
H2O are present in 0.20 mol?
a. | 0.2 g | c. | 35.9 g | b. | 3.6 g | d. | 89.9 g |
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26.
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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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27.
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The molar mass of NH3 is 17.03 g/mol. How many moles of
NH3 are present in 107.1 g?
a. | 0.1623 mol | c. | 6.289 mol | b. | 3.614 mol | d. | 107.1 mol |
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28.
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How many Cl– ions are present in 2.00 mol of KCl?
a. | 1.20  1024 | c. | 2.00 | b. | 6.02 
1024 | d. | 0.5 |
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29.
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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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30.
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How many molecules are there in 5.0 g of methyl alcohol,
CH3OH?
a. | 9.4  1022 | c. | 3.6 
1024 | b. | 3.0  1024 | d. | 3.8 
1024 |
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31.
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What is the percentage composition of CO?
a. | 50% C, 50% O | c. | 25% C, 75% O | b. | 12% C, 88% O | d. | 43% C, 57% O |
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32.
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What is the percentage composition of CuCl2?
a. | 33% Cu, 66% Cl | c. | 65.50% Cu, 34.50% Cl | b. | 50% Cu, 50% Cl | d. | 47.27% Cu, 52.73%
Cl |
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33.
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The percentage composition of sulfur in SO2 is about 50%. What is the
percentage of oxygen in this compound?
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34.
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What is the mass percentage of OH– in
Ca(OH)2?
a. | 45.9% | c. | 75% | b. | 66.6% | d. | 90.1% |
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35.
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The empirical formula for a compound shows the symbols of the elements with
subscripts indicating the
a. | actual numbers of atoms in a molecule. | b. | number of moles of the compound in 100
g. | c. | smallest whole-number ratio of the atoms. | d. | atomic masses of
each element. |
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36.
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The empirical formula may not represent the actual composition of a unit of
a(n)
a. | ionic compound. | c. | salt. | b. | molecular compound. | d. | crystal. |
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37.
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What is the empirical formula for a compound that is 31.9% potassium, 28.9%
chlorine, and 39.2% oxygen?
a. | KClO2 | c. | K2Cl2O3 | b. | KClO3 | d. | K2Cl2O5 |
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38.
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What is the empirical formula for a compound that is 43.6% phosphorus and 56.4%
oxygen?
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39.
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What is the empirical formula for a compound that is 53.3% O and 46.7%
Si?
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40.
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A compound contains 259.2 g of F and 40.8 g of C. What is the empirical formula
for this compound?
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41.
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A compound contains 64 g of O and 8 g of H. What is the empirical formula for
this compound?
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42.
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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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43.
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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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44.
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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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45.
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Of the following molecular formulas for hydrocarbons, which is an empirical
formula?
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46.
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Which of the following molecular formulas does not have the corresponding
empirical formula XY2Z?
a. | X2Y4Z2 | c. | X6Y12Z6 | b. | XYZ | d. | X3Y6Z3 |
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47.
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A compound's empirical formula is C2H5. If the
formula mass is 58 amu, what is the molecular formula?
a. | C3H6 | c. | C5H8 | b. | C4H10 | d. | C5H15 |
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48.
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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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49.
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A compound's empirical formula is CH3. If the formula mass is 30
amu, what is the molecular formula?
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50.
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What is the molecular formula of a compound that has a formula mass of 50.48 amu
and an empirical formula of CH3Cl?
a. | CHCl | c. | CH3Cl | b. | CH2Cl | d. | CH2Cl2 |
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