Matching
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Match each item with the correct statement below. a. | actual yield | e. | limiting reagent | b. | percent yield | f. | mass | c. | theoretical
yield | g. | number of
molecules | d. | excess reagent | h. | volume |
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1.
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This quantity can always be used in the same way as moles when interpreting
balanced chemical equations.
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2.
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This is conserved only in reactions where the temperature is constant and the
number of moles of gaseous reactants is the same as that of gaseous products.
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3.
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This is conserved in every ordinary chemical reaction.
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4.
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the reactant that determines the amount of product that can be formed in a
reaction
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5.
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the maximum amount of product that could be formed from given amounts of
reactants
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6.
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the reactant that is not completely used up in a reaction
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7.
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the amount of product formed when a reaction is carried out in the
laboratory
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8.
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the ratio of the actual yield to the theoretical yield
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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9.
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The calculation of quantities in chemical equations is called ____.
a. | stoichiometry | c. | percent composition | b. | dimensional analysis | d. | percent yield |
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10.
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If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many
bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?
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11.
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What is conserved in the reaction shown below? H ( g) + Cl ( g) ®
2HCl( g)
a. | mass only | c. | mass, moles, and molecules only | b. | mass and moles
only | d. | mass, moles,
molecules, and volume |
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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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In every chemical reaction, ____.
a. | mass and molecules are conserved | c. | mass and atoms are
conserved | b. | moles and liters are conserved | d. | moles and molecules are
conserved |
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14.
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In a chemical reaction, the mass of the products ____.
a. | is less than the mass of the reactants | b. | is greater than the mass of the
reactants | c. | is equal to the mass of the reactants | d. | has no relationship to the mass of the
reactants |
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15.
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In any chemical reaction, the quantities that are preserved are ____.
a. | the number of moles and the volumes | b. | the number of molecules and the
volumes | c. | mass and number of atoms | d. | mass and moles |
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16.
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The first step in most stoichiometry problems is to ____.
a. | add the coefficients of the reagents | c. | convert given quantities to
volumes | b. | convert given quantities to moles | d. | convert given quantities to
masses |
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17.
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In the reaction 2CO( g) + O ( g) ® 2CO ( g), what is the ratio of moles of oxygen
used to moles of CO produced?
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18.
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Which of the following is true about the total number of reactants and the total
number of products in the reaction shown below? C H ( l) + 8O ( g) ®
5CO ( g) + 6H O( g)
a. | 9 moles of reactants chemically change into 11 moles of product. | b. | 9 grams of reactants
chemically change into 11 grams of product. | c. | 9 liters of reactants chemically change into 11
liters of product. | d. | 9 atoms of reactants chemically change into 11
atoms of product. |
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19.
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Which of the following is an INCORRECT interpretation of the balanced equation
shown below? 2S( s) + 3O ( g) ®
2SO ( g)
a. | 2 atoms S + 3 molecules O ® 2 molecules SO | b. | 2 g S + 3 g
O ® 2 g SO | c. | 2 mol S + 3 mol O
® 2 mol SO | d. | none of the
above |
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20.
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How many moles of aluminum are needed to react completely with 1.2 mol of
FeO? 2Al( s) + 3FeO( s) ® 3Fe( s) + Al O ( s)
a. | 1.2 mol | c. | 1.6 mol | b. | 0.8 mol | d. | 2.4 mol |
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21.
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Calculate the number of moles of Al O that are produced when 0.60 mol of Fe is produced in the following
reaction. 2Al( s) + 3FeO( s) 3Fe( s) + Al O ( s)
a. | 0.20 mol | c. | 0.60 mol | b. | 0.40 mol | d. | 0.90 mol |
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22.
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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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23.
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Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many
moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum? 2Al( s) +
3H SO ( aq) ® Al (SO ) ( aq) + 3H ( g)
a. | 0.100 mol | c. | 15.0 mol | b. | 10.0 mol | d. | 22.5 mol |
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24.
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When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen
react with 2.4 mol of iron in the rusting reaction? 4Fe( s) + 3O ( g) ® 2Fe2O ( s)
a. | 1.2 mol | c. | 2.4 mol | b. | 1.8 mol | d. | 3.2 mol |
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25.
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At STP, how many liters of oxygen are required to react completely with 3.6
liters of hydrogen to form water? 2H ( g) + O ( g) ® 2H O( g)
a. | 1.8 L | c. | 2.0 L | b. | 3.6 L | d. | 2.4 L |
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26.
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Which type of stoichiometric calculation does not require the use of the molar
mass?
a. | mass-mass problems | c. | mass-particle problems | b. | mass-volume
problems | d. | volume-volume
problems |
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27.
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The equation below shows the decomposition of lead nitrate. How many grams of
oxygen are produced when 11.5 g NO is formed?
a. | 1.00 g | c. | 2.88 g | b. | 2.00 g | d. | 32.0 g |
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28.
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Iron(III) oxide is formed when iron combines with oxygen in the air. How many
grams of Fe O are formed when 16.7 g of Fe
reacts completely with oxygen?
a. | 12.0 g | c. | 47.8 g | b. | 23.9 g | d. | 95.6 g |
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29.
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When glucose is consumed, it reacts with oxygen in the body to produce carbon
dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45 g of C H O completely reacted with
oxygen?
a. | 1.5 g | c. | 11 g | b. | 1.8 g | d. | 66 g |
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30.
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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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