Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which observation does not indicate that a chemical reaction has
occurred?
a. | formation of a precipitate | c. | evolution of heat and
light | b. | production of a gas | d. | change in total mass of substances |
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2.
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The word equation solid carbon + oxygen gas ®
carbon dioxide gas + energy, represents a chemical reaction because
a. | the reaction releases energy. | b. | CO2 has chemical properties that
differ from those of C and O. | c. | the reaction absorbs
energy. | d. | CO2 is a gas and carbon is a crystal. |
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3.
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According to the law of conservation of mass, the total mass of the reacting
substances is
a. | always more than the total mass of the products. | b. | always less than the
total mass of the products. | c. | sometimes more and sometimes less than the
total mass of the products. | d. | always equal to the total mass of the
products. |
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4.
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Which word equation represents the reaction that produces water from hydrogen
and oxygen?
a. | Water is produced from hydrogen and oxygen. | b. | Hydrogen plus oxygen
yields water. | c. | H2 + O2 ®
water. | d. | Water can be separated into hydrogen and oxygen. |
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5.
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How would oxygen be represented in the formula equation for the reaction of
methane and oxygen to yield carbon dioxide and water?
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6.
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In the chemical equation 2Mg(s) + O2(g) ?
2MgO(s),
a. | Mg represents the product magnesium. | c. | Mg represents the reagent
magnesium. | b. | the reaction yields magnesium. | d. | O2 represents the product oxygen
gas. |
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7.
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Which coefficients correctly balance the formula equation CaO + H2O
® Ca(OH)2?
a. | 2, 1, 2 | c. | 1, 2, 1 | b. | 1, 2, 3 | d. | 1, 1, 1 |
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8.
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After the first steps in writing an equation, the equation is balanced by
a. | adjusting subscripts to the formula(s). | b. | adjusting
coefficients to the smallest whole-number ratio. | c. | changing the products
formed. | d. | making the number of reactants equal to the number of
products. |
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9.
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The complete balanced equation for the reaction between zinc hydroxide and
acetic acid is
a. | ZnOH + CH3COOH ® ZnCH3COO +
H2O. | b. | Zn(OH)2 + CH3COOH ® Zn +
2CO2 +3H2O. | c. | Zn(OH)2 + 2CH3COOH ® Zn(CH3COO)2 + 2H2O. | d. | Zn(OH)2 +
2CH3COOH ® Zn(CH3COO)2 +
H2 + O2. |
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10.
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The equation AX ® A + X is the general equation
for a
a. | synthesis reaction. | c. | combustion reaction. | b. | decomposition reaction. | d. | single-displacement
reaction. |
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11.
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In what kind of reaction does one element replace a similar element in a
compound?
a. | displacement reaction | c. | decomposition reaction | b. | combustion | d. | ionic reaction |
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12.
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In what kind of reaction does a single compound produce two or more simpler
substances?
a. | decomposition reaction | c. | single-displacement reaction | b. | synthesis
reaction | d. | ionic
reaction |
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13.
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In what kind of reaction do the ions of two compounds exchange places in aqueous
solution to form two new compounds?
a. | synthesis reaction | c. | decomposition reaction | b. | double-displacement
reaction | d. | combustion
reaction |
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14.
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The reaction represented by the equation 2KClO3(s) ® 2KCl(s) + 3O2(g) is a(n)
a. | synthesis reaction. | c. | combustion reaction. | b. | decomposition reaction. | d. | ionic reaction. |
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15.
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When a binary compound decomposes, what is produced?
a. | an oxide | c. | a tertiary compound | b. | an acid | d. | two elements |
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16.
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Many metal hydroxides decompose when heated to yield metal oxides and
a. | metal hydrides. | c. | carbon dioxide. | b. | water. | d. | an acid. |
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17.
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The replacement of bromine by chlorine in a salt is an example of a
single-displacement reaction by
a. | halogens. | c. | water. | b. | sodium. | d. | electrolysis. |
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18.
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When a slightly soluble solid compound is produced in a double-displacement
reaction, a
a. | gas bubbles off. | c. | combustion reaction takes place. | b. | precipitate is
formed. | d. | halogen is
produced. |
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19.
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A precipitate may form in a double-displacement reaction when
a. | hydrogen gas reacts with a metal. | b. | positive ions combine with negative
ions. | c. | water boils out of the solution. | d. | a gas escapes. |
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20.
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The reaction of calcium oxide, CaO, with water yields
a. | calcium and oxygen gas. | c. | calcium and a
salt. | b. | calcium hydroxide. | d. | carbon dioxide and water. |
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21.
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Predict the product of the reaction represented by the following equation:
MgO + CO2 ®
a. | MgCO3 | c. | MgC + O3 | b. | Mg + CO3 | d. | MgCO2 +
O |
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22.
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Magnesium hydroxide decomposes to yield magnesium oxide and
a. | hydrogen. | c. | water. | b. | oxygen. | d. | salt. |
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23.
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When sodium chlorate, NaClO3, decomposes, the products are
a. | sodium hydroxide and water. | c. | sodium and chlorine
oxide. | b. | sodium oxide and chlorine. | d. | sodium chloride and oxygen. |
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24.
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An element in the activity series can replace any element
a. | in the periodic table. | c. | above it on the list. | b. | below it on the
list. | d. | in its
group. |
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25.
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If a certain metal is placed in an ionic solution containing another metal and
no reaction occurs, then the metal originally in the solution is
a. | a halogen. | c. | not on the activity series. | b. | higher on the
activity series. | d. | unreactive. |
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