Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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In a chemical reaction
a. | the mass of the reactants equals the mass of the products. | b. | the mass of the
products is greater than the mass of reactants. | c. | the number of atoms in the reactants and
products must change. | d. | energy as heat must be added to the
reactants. |
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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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In writing a chemical equation that produces hydrogen gas, the correct
representation of hydrogen gas is
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4.
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What is the small whole number that appears in front of a formula in a chemical
equation?
a. | a subscript | c. | a ratio | b. | a superscript | d. | a coefficient |
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5.
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To balance a chemical equation, it may be necessary to adjust the
a. | coefficients. | c. | formulas of the products. | b. | subscripts. | d. | number of products. |
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6.
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A chemical equation is balanced when the
a. | coefficients of the reactants equal the coefficients of the
products. | b. | same number of each kind of atom appears in the reactants and in the
products. | c. | products and reactants are the same chemicals. | d. | subscripts of the
reactants equal the subscripts of the products. |
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7.
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In the word equation, sodium oxide + water ®
sodium hydroxide, the formula for
sodium hydroxide is represented by
a. | Na2OH. | c. | NaO2. | b. | NaOH. | d. | Na2O. |
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8.
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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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9.
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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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10.
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Which of the following is a formula equation for the formation of carbon dioxide
from carbon and oxygen?
a. | Carbon plus oxygen yields carbon dioxide. | c. | CO2 ® C + O2 | b. | C + O2 ® CO2 | d. | 2C + O ®
CO2 |
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11.
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A chemical formula written over the arrow in a chemical equation
signifies
a. | a by-product. | c. | a catalyst for the reaction. | b. | the formation of a
gas. | d. | an
impurity. |
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12.
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When the equation Fe3O4 + Al ® Al2O3 + Fe is correctly balanced, what is the
coefficient of Fe?
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13.
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Which coefficients correctly balance the formula equation
NH4NO2(s)® N2(g) +
H2O(l)?
a. | 1, 2, 2 | c. | 2, 1, 1 | b. | 1, 1, 2 | d. | 2, 2, 2 |
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14.
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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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15.
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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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16.
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What is the balanced equation for the combustion of sulfur?
a. | S(s) + O2(g) ®
SO(g) | b. | S(s) + O2(g) ®
SO2(g) | c. | 2S(s) + 3O2(g) ® SO3(s) | d. | S(s) + 2O2(g) ®
SO42–(aq) |
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17.
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Which equation is not balanced?
a. | 2H2 + O2 ®
2H2O | b. | 4H2 + 2O2 ®
4H2O | c. | H2 + H2 + O2 ®
H2O + H2O | d. | 2H2 + O2 ® H2O |
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18.
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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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19.
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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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20.
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The equation A + X ® AX is the general equation
for a(n)
a. | combustion reaction. | c. | synthesis reaction. | b. | ionic reaction. | d. | double-displacement
reaction. |
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21.
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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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22.
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The reaction represented by the equation 2Mg(s) + O2(g)
® 2MgO(s) is a
a. | synthesis reaction. | c. | single-displacement reaction. | b. | decomposition
reaction. | d. | double-displacement reaction. |
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23.
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The reaction represented by the equation Mg(s) + 2HCl(aq) ® H2(g) + MgCl2(aq) is a
a. | composition reaction. | c. | single-displacement reaction. | b. | decomposition
reaction. | d. | double-displacement reaction. |
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24.
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The reaction represented by the equation 2HgO(s) ® 2Hg(l) + O2(g) is a(n)
a. | single-displacement reaction. | c. | combustion
reaction. | b. | synthesis reaction. | d. | decomposition reaction. |
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25.
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The reaction represented by the equation Cl2(g) +
2KBr(aq) ® 2KCl(aq) + Br2(l) is
a(n)
a. | synthesis reaction. | c. | single-displacement reaction. | b. | decomposition
reaction. | d. | combustion
reaction. |
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26.
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In one type of synthesis reaction, an element combines with oxygen to yield
a(n)
a. | acid. | c. | oxide. | b. | hydroxide. | d. | metal. |
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27.
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The decomposition of a substance by an electric current is called
a. | electrolysis. | c. | ionization. | b. | conduction. | d. | transformation. |
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28.
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When heated, a metal carbonate decomposes into a metal oxide and
a. | carbon. | c. | oxygen. | b. | carbon dioxide. | d. | hydrogen. |
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29.
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An active metal and a halogen react to form a(n)
a. | salt. | c. | acid. | b. | hydroxide. | d. | oxide. |
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30.
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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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31.
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When a metal chlorate is heated, it decomposes to yield a metal chloride
and
a. | a metal oxide. | c. | hydrogen. | b. | a metal hydroxide. | d. | oxygen. |
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32.
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Some acids, such as carbonic acid, decompose to nonmetal oxides and
a. | water. | c. | oxygen. | b. | a salt. | d. | peroxide. |
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33.
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When heated, metallic chlorates decompose into
a. | metallic oxides and chlorine. | b. | metallic chlorides and
oxygen. | c. | a metal and a compound of chlorine and oxygen. | d. | a metal, chlorine,
and oxygen. |
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34.
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In the equation 2Al(s) + 3Fe(NO3)2(aq) ® 3Fe(s) + 2Al(NO3)3(aq), iron has been
replaced by
a. | nitrate. | c. | aluminum. | b. | water. | d. | nitrogen. |
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35.
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Group 1 metals react with water to produce metal hydroxides and
a. | metal hydroxides. | c. | oxygen. | b. | hydrochloric acid. | d. | hydrogen. |
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36.
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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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37.
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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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38.
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An insoluble gas that forms in a double-displacement reaction in aqueous
solution
a. | bubbles out of solution. | c. | disassociates into
ions. | b. | forms a precipitate. | d. | reacts with the water. |
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39.
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Some metals, such as iron, react with steam to produce hydrogen gas and a
a. | metal hydroxide. | c. | metallic acid. | b. | metal hydride. | d. | metal oxide. |
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40.
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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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41.
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Magnesium hydroxide decomposes to yield magnesium oxide and
a. | hydrogen. | c. | water. | b. | oxygen. | d. | salt. |
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42.
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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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43.
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If chlorine gas is produced by halogen replacement, the other halogen in the
reaction must be
a. | bromine. | c. | astatine. | b. | iodine. | d. | fluorine. |
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44.
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The ability of an element to react is the element's
a. | valence. | c. | stability. | b. | activity. | d. | electronegativity. |
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45.
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What is the name of a list of elements arranged according to the ease with which
they undergo certain chemical reactions?
a. | reactivity list | c. | activity series | b. | reaction sequence | d. | periodic list |
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46.
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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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47.
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If metal X is lower than metal Y in the activity series, then metal X
a. | replaces ions of metal Y in a solution. | b. | loses electrons more
readily than does metal Y. | c. | loses electrons less readily than does metal
Y. | d. | forms positive ions more readily than does metal Y. |
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48.
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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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49.
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Predict what happens when lead is added to nitric acid.
a. | No reaction occurs. | c. | Lead oxide forms. | b. | Oxygen is released. | d. | Hydrogen is
released. |
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50.
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Which reaction does not occur?
a. | 2HF(aq) + Cl2(g) ®
F2(g) + 2HCl(aq) | b. | 2Na(s) + ZnF2(aq)
® 2NaF(aq) + Zn(s) | c. | Fe(s) +
CuCl2(aq) ® FeCl2(aq) +
Cu(s) | d. | 2HCl(aq) + Mg(s) ®
MgCl2(aq) + H2(g) |
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