Multiple Choice
Identify the choice that best completes the statement or answers
the question.
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1.
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What is the SI base unit used to measure the amount of a substance?
a. | Kelvin | c. | Meter | b. | Kilogram | d. | Mole |
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2.
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How many moles of calcium are in 425 g calcium (Ca)?
a. | 10.6 mol | c. | 171 mol | b. | 70.5 mol | d. | 255 mol |
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3.
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What is the mass in grams of 1.02 ´ 1024
atoms manganese (Mn)?
a. | 0.112 ´ 101 g | c. | 9.30 ´ 10–1 g | b. | 0.169 ´
101 g | d. | 9.30 ´ 101 g |
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4.
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The number of atoms in a mole of any pure substance is called
a. | its atomic number. | c. | its mass number. | b. | Avogadro’s number. | d. | its gram-atomic
number. |
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5.
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How many atoms of fluorine are in a molecule of carbon tetrafluoride,
CF4?
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6.
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The coefficients in a chemical equation represent the
a. | masses, in grams, of all reactants and products. | b. | relative numbers of
moles of reactants and products. | c. | number of atoms in each compound in a
reaction. | d. | number of valence electrons involved in the reaction. |
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7.
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If one knows the mole ratio of a reactant and product in a chemical reaction,
one can
a. | estimate the energy released in the reaction. | b. | calculate the speed
of the reaction. | c. | calculate the mass of the product produced from a known mass of
reactant. | d. | decide whether the reaction is reversible. |
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8.
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In the reaction represented by the equation 2Al2O3 ® 4Al + 3O2, what is the mole ratio of aluminum to
oxygen?
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9.
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For the reaction represented by the equation N2 + 3H2
® 2NH3, how many moles of nitrogen are required to produce
18 mol of ammonia?
a. | 9.0 mol | c. | 27 mol | b. | 18 mol | d. | 36 mol |
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Use the table below to answer the following questions.
| Element | Symbol | Atomic
Mass | | Bromine | Br | 79.90 | | Calcium | Ca | 40.08 | | Carbon | C | 12.01 | | Chlorine | Cl | 35.45 | | Cobalt | Co | 58.93 | | Copper | Cu | 63.55 | | Fluorine | F | 19.00 | | Hydrogen | H | 1.01 | | Iodine | I | 126.90 | | Iron | Fe | 55.85 | | Lead | Pb | 207.2 | | Magnesium | Mg | 24.30 | | Mercury | Hg | 200.59 | | Nitrogen | N | 14.01 | | Oxygen | O | 15.00 | | Potassium | K | 39.10 | | Sodium | Na | 22.99 | | Sulfur | S | 32.01 | | | |
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10.
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For the reaction represented by the equation 2Na + Cl2 ® 2NaCl, how many grams of chlorine gas are required to react completely
with 2.00 mol of sodium?
a. | 35.5 g | c. | 141.8 g | b. | 70.9 g | d. | 212.7 g |
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11.
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Ozone, O 3, is produced by the reaction represented by the following
equation:  What mass of ozone will form from the
reaction of 2.0 g of NO 2 in a car's exhaust and excess oxygen? a. | 1.1 g O3 | c. | 2.1 g O3 | b. | 1.8 g O3 | d. | 4.2 g
O3 |
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12.
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What is conserved in the reaction shown below? N  ( g) + 3F  ( g) ® 2NF  ( g) a. | atoms only | c. | mass and atoms only | b. | mass only | d. | moles only |
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13.
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How many moles of glucose, C  H  O  , can be "burned" biologically
when 10.0 mol of oxygen is available? C  H  O  ( s) + 6O  ( g) ® 6CO  ( g) + 6H  O( l) a. | 0.938 mol | c. | 53.3 mol | b. | 1.67 mol | d. | 60.0 mol |
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14.
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Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas.
How many grams of aluminum sulfate would be formed if 250 g H  SO  completely reacted with
aluminum?  a. | 0.85 g | c. | 450 g | b. | 290 g | d. | 870 g |
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15.
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How many liters of NH  are needed to react
completely with 30.0 L of NO (at STP)? 4NH  ( g) +
6NO( g)  5N  ( g) + 6H  O( g) a. | 5.0 L | c. | 7.5 L | b. | 20.0 L | d. | 120.0 L |
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16.
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How many liters of chlorine gas can be produced when 0.98 L of HCl react with
excess O  at STP? 4HCl( g) + O  ( g)  2Cl  ( g) + 2H  O( g) a. | 0.98 L | c. | 3.9 L | b. | 0.49 L | d. | 2.0 L |
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17.
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How many moles of silver atoms are in 1.8  10  atoms of silver?
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18.
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The mass of a mole of NaCl is the ____.
a. | molar mass | c. | molecular mass | b. | atomic mass | d. | gram atomic
mass |
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19.
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How many moles of CaBr  are in 5.0 grams of
CaBr  ?
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20.
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What is the number of moles in 500 L of He gas at STP?
a. | 0.05 mol | c. | 22 mol | b. | 0.2 mol | d. | 90 mol |
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21.
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Calculate the number of moles of hydrogen atoms in 4.75 mol sulfuric
acid.  a. | 2.38 mol | c. | 9.50 mol | b. | 4.75 mol | d. | 33.2 mol |
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22.
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How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
a. | 2.0 mol | c. | 1.0 mol | b. | 0.5 mol | d. | 4.0 mol |
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23.
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A sample of a compound is found to contain 0.404 grams of Fe and 0.174 grams of
O. What is the empirical formula for this compound?
a. | FeO | c. | Fe2O3 | b. | FeO2 | d. | Fe3O4 |
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