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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Which
of the following pairs of elements is most likely to form an ionic compound? a. | magnesium and
fluorine | c. | nitrogen and
sulfur | b. | oxygen and chlorine | d. | sodium and aluminum | | | | |
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2.
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How
are chemical formulas of binary ionic compounds generally written? a. | Roman numeral
first, then anion, then cation | b. | anion on left, cation on right | c. | subscripts
first, then ions | d. | cation on left, anion on right | | |
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3.
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Which
type of solid has the highest melting point? a. | nonmetallic solid | c. | metal | b. | ionic
solid | d. | network
solid | | | | |
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4.
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Which
of the following particles are free to drift in metals? a. | electrons | c. | cations | b. | neutrons | d. | protons | | | | |
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5.
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An
ionic bond is a bond between ____. a. | the ions of two different
metals | c. | valence
electrons and cations | b. | the ions of two different
nonmetals | d. | a cation and an
anion | | | | |
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6.
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Which
of the following is true about an ionic compound? a. | It is composed of anions and
cations. | c. | It is a
salt. | b. | It is held together by ionic
bonds. | d. | all of the
above | | | | |
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7.
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Which
of the following formulas represents a molecular compound? a. | ZnO | c. | SO | b. | Xe | d. | BeF | | | | |
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8.
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A
molecule with a single covalent bond is ____.
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9.
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Why
do atoms share electrons in covalent bonds? a. | to attain a noble-gas electron
configuration | b. | to become more polar | c. | to become ions
and attract each other | d. | to increase their atomic numbers | | |
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10.
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A
bond formed between a silicon atom and an oxygen atom is likely to be ____.
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11.
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Binary molecular compounds are made of two ____. a. | cations | c. | nonmetallic
elements | b. | metallic elements | d. | polyatomic ions | | | | |
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12.
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Molecular compounds are usually ____. a. | composed of
positive and negative ions | b. | exceptions to the law of definite
proportions | c. | composed of two or more transition
elements | d. | composed of two or more nonmetallic
elements | | |
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13.
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What
is the shape of a molecule with a triple bond? a. | tetrahedral | c. | linear | b. | pyramidal | d. | bent | | | | |
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14.
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The
octet rule states that, in chemical compounds, atoms tend to have ____. a. | eight electrons
in their principal energy level | b. | the electron configuration of a noble
gas | c. | more protons
than electrons | d. | more electrons than protons | | |
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15.
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How
many valid electron dot formulas—having the same number of electron pairs for a molecule or
ion—can be written when a resonance structure occurs? a. | 0 | c. | 1
only | b. | 2
only | d. | 2 or
more | | | | |
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16.
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When
one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n)
____. a. | ionic covalent
bond | c. | coordinate
covalent bond | b. | unequal covalent bond | d. | one-sided covalent bond | | | | |
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17.
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What
is the net charge of the ionic compound calcium fluoride? a. | 2– | c. | 0 | b. | 1– | d. | 1 | | | | |
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18.
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The
shape of the methane molecule is called ____. a. | four-cornered | c. | tetrahedral | b. | square | d. | planar | | | | |
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19.
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Which
of the following formulas represents an ionic compound?
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20.
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Under
what conditions can potassium bromide conduct electricity? a. | only when
dissolved | b. | only when it is in crystal form | c. | only when melted
or dissolved in water | d. | only when melted | | |
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21.
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Which
of the following occurs in an ionic bond? a. | Oppositely charged ions attract. | b. | Two atoms share
more than two electrons. | c. | Like-charged ions attract. | d. | Two atoms share
two electrons. | | |
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22.
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Which
of the following is true about the melting temperature of potassium chloride? a. | Potassium
chloride does not melt. | b. | The melting temperature is relatively
high. | c. | The melting temperature is relatively
low. | d. | The melting
temperature is variable and unpredictable. | | |
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23.
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What
characteristic of metals makes them good electrical conductors? a. | Their crystal
structures can be rearranged easily. | b. | They have mobile valence electrons. | c. | They have mobile
protons. | d. | They have mobile cations. | | |
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24.
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Which
of the following is NOT a characteristic of most ionic compounds? a. | When melted,
they conduct an electric current. | b. | They are composed of metallic and nonmetallic
elements. | c. | They have low melting points. | d. | They are
solids. | | |
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25.
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Which
of these elements does not exist as a diatomic molecule?
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