Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Balancing a chemical equation so that the same number of atoms of each element is
found in both the reactants and the products is an illustration of a. | the law of
conservation of mass. | b. | a
double-replacement reaction. | | | | |
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2.
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In
which type of reaction do ions in two compounds switch places? a. | double-replacement | b. | single-replacement | | | | |
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3.
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Which
of the following is an example of the use of activation energy? a. | eating | b. | holding a lit
match to paper | | | | |
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4.
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Which
of the following is an example of a diatomic element?
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5.
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Which
of the following is an example of a single-replacement reaction? a. | Fe + 2HCl
®
FeCl2 + H2 | b. | 2Mg + O2 ®
2MgO | | | | |
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6.
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How
many atoms are represented in the formula CaCO3?
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7.
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Which
of the following usually increases the rate of a reaction? a. | decreasing the
concentration of the reactants | b. | grinding a solid reactant into a
powder | | |
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8.
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A
catalyst a. | is permanently
changed when used in a reaction. | b. | lowers the activation energy of a
reaction. | | |
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9.
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Which
of the following is NOT a clue that a chemical reaction is taking place? a. | a substance
bends | b. | change in
color | | | | |
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10.
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A
shorthand method of identifying an element is a chemical
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11.
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The
starting materials in a chemical reaction are
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12.
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What
separates the formulas of the reactants from the formulas of the products? a. | a plus
sign | c. | a yields
sign | b. | an
arrow | d. | both (b) and
(c) | | | | |
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Determine the balanced equation for each of the following:
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13.
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H2 + O2 ®H2O a. | 2H2 +
O2 ®
2H2O | b. | H2 +
2O2 ®
2H2O | | | | |
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14.
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A
reaction in which a single compound breaks down to form two or more simpler substances is
a a. | synthesis
reaction. | b. | decomposition
reaction. | | | | |
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15.
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A
reaction in which an element takes the place of another element that is part of a compound is a
a. | double-replacement reaction. | b. | single-replacement reaction. | | | | |
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16.
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How
many atoms of oxygen are there in Al2(SO4)3?
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17.
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A
substance that speeds up a reaction without being permanently changed is called a(n)
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18.
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Which
of the following is the formula for sodium fluoride?
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Completion
Complete each sentence or
statement.
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19.
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A
____________________ is a shorthand notation that represents a compound or diatomic element.
(coefficient or chemical formula)
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20.
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The
____________________ in a reaction is the minimum amount of energy needed for substances to react.
(catalyst or activation energy)
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21.
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In a
____________________ reaction, ions in different compounds switch places. (single-replacement or
double-replacement)
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22.
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In a
chemical formula, if no ____________________ is written after an element, then only one atom of that
element is present. (subscript or coefficient)
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23.
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A(n)
____________________ slows down or stops a chemical reaction. (catalyst or inhibitor)
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Short Answer
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24.
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List
four clues that a chemical reaction is occurring.
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25.
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Explain how a balanced chemical equation illustrates that mass is never lost or gained
in a chemical reaction.
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