Modified True/False
Indicate whether the statement is true or
false. If false, change the identified word or phrase to make the statement true.
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1.
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The compound with the formula K2O is called potassium
oxygen.
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2.
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When an atom gains an electron it becomes a positive ion.
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3.
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When electrons are transferred between two atoms, a covalent bond is
formed.
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4.
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The attraction between a positive ion and a negative ion results in a
covalent bond.
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5.
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Orderly crystal shapes, high melting points, and electrical conductivity when
dissolved in water are properties of ionic compounds.
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6.
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Molecules are neutral.
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7.
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Low melting points and lack of electrical conductivity are properties of
molecular compounds.
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8.
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Because a water molecule has a slight positive charge at one end and a slight
negative charge at the other end, it is a nonpolar molecule.
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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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Which of the following compounds is covalent compound?
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10.
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In the three molecules, O2, HCl, and F2, what atom would
have a partial negative charge?
a. | fluorine | b. | chlorine | c. | oxygen | d. | hydrogen |
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11.
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What kind of chemical bond is formed when a transfer of electrons occurs?
a. | ionic | b. | covalent | c. | magnetic | d. | hydrate |
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12.
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What is the correct formula for the compound formed by Mg+2 and
O-2?
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13.
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What is the chemical name for the compound with the formula
Na2S?
a. | sodium sulfide | c. | magnesium sulfide | b. | lithium oxide | d. | sodium fluoride |
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14.
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Fluorine, F, forms a binary ionic compound with lithium, Li. What is the name of
this compound?
a. | lithium fluoride | c. | fluorine lithium | b. | fluorine lithide | d. | lithium
fluorine |
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15.
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A double covalent bond contains _____ electrons?
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16.
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You see a structural formula in which the symbols for elements are connected by
a long dash. You can assume that the chemical bonds in the compound are
a. | covalent. | b. | metallic. | c. | unstable. | d. | ionic. |
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17.
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Cations are ____ ions.
a. | charged. | b. | negative. | c. | neutral. | d. | positive. |
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18.
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How many covalent bonds can oxygen form?
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19.
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Which is a property shared by most molecular compounds?
a. | low melting point | c. | nonpolar bonds | b. | high boiling point | d. | high melting
point |
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20.
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A chemical bond that occurs when atoms share electrons EQUALLY is a(n) ____
bond.
a. | polyatomic | b. | nonpolar | c. | ionic | d. | polar
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21.
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In the compound MgCl2, the subscript 2 indicates that
a. | there are two chloride ions for each magnesium ion. | b. | there are two
magnesium ions for each ion of chlorine | c. | the chloride ion is twice the size of the
magnesium ion. | d. | magnesium and chlorine form a double covalent bond. |
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22.
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Why do the noble gases NOT form compounds readily?
a. | They have seven electrons in the outer energy levels. | b. | They have no
electrons. | c. | Their outer energy levels are completely filled with electrons. | d. | They have empty
outer energy levels. |
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23.
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What is the correct Lewis structure for hydrogen chloride, HCl?  
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24.
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A chemical bond that occurs when atoms share electrons UNEQUALLY is a(n) ____
bond.
a. | polyatomic | c. | nonpolar covalent | b. | polar covalent | d. | polar ionic |
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25.
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When two atoms of the same nonmetal react (like two oxygens or two hydrogens),
they often form a(an)
a. | ionic bond. | c. | diatomic molecule. | b. | polar molecule. | d. | polyatomic ion. |
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26.
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What will happen to Magnesium , Mg when it bonds?
a. | gain 6 electrons | c. | gain 2 protons | b. | lose 2 electrons | d. | gain 2
electrons |
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27.
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Bonds that form between two nonmetals are usually
a. | covalent. | b. | weak. | c. | impossible. | d. | ionic. |
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28.
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The formation of an ionic bond involves the
a. | sharing of electrons. | c. | transfer of electrons. | b. | transfer of
protons. | d. | transfer of
neutrons. |
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29.
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Which element can never have atoms with eight valence electrons even when it
forms bonds?
a. | carbon | b. | nitrogen | c. | oxygen | d. | hydrogen |
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30.
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The kinds and the exact number of atoms of each element in a unit of the
compound can be shown in a ____.
a. | superscript | c. | chemical formula | b. | chemical symbol | d. | subscript |
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31.
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What will happen to Oxygen, O when it bonds?
a. | gain 2 electrons | c. | lose 2 protons | b. | lose 2 electrons | d. | lose 6
electrons |
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32.
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The sum of the charges in a neutral compound is always ____.
a. | a negative number | c. | one | b. | a positive number | d. | zero |
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33.
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Which of the following formulas represents a compound whose molecules contain
six shared electrons?
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34.
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Study the electron dot diagrams below for lithium, carbon, fluorine, and neon
and choose the correct statement below. a. | Neon will bond with eight lithium’s to form an ionic bond. | b. | Carbon will bond
with four lithium’s to form a covalent bond. | c. | Lithium will lose it’s only valence
electron and fluorine will accept it to form an ionic bond. | d. | Lithium will lose
it’s only valence electron to fluorine to form a covalent bond. |
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35.
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A chemical bond that occurs when atoms share electrons is a(n) ____ bond.
a. | magnetic | c. | covalent | b. | ionic | d. | polyatomic |
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36.
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In an electron dot diagram, the dots are used to represent
a. | valence electrons. | c. | neutrons | b. | all electrons. | d. | protons |
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37.
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Which of the following is NOT a characteristic property of ionic
compounds?
a. | They have high melting points. | b. | They have low melting
points. | c. | They form crystals. | d. | They conduct electricity when dissolved in
water. |
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38.
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In what form can an ionic compound conduct electricity?
a. | when dissolved in water | c. | as a crystal | b. | as a
solid | d. | when warmed
slightly |
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39.
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How many electrons are needed in the outer energy levels of most atoms for the
atom to be chemically stable?
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40.
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Ionic compounds are held together by a force best compared
to________________?
a. | electronic repulsion | c. | both a and b | b. | magnetic attraction | d. | neither a or b |
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41.
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In the name carbon dioxide, the prefix of the second word indicates that
a molecule of carbon dioxide contains
a. | two oxygen atoms. | c. | a polyatomic ion. | b. | an ionic bond. | d. | two carbon
atoms. |
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42.
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Anions are ____ ions.
a. | negative. | b. | positive. | c. | neutral. | d. | charged. |
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43.
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A single covalent bond contains _____ electrons?
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44.
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A double covalent bond contains _____ electrons?
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45.
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The rule that sates that elements will gain, lose or share electrons in order to
have a full outer shell is called?
a. | Foster’s rule | c. | Octet rule | b. | The Rule of 2 | d. | None of these |
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46.
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How many chloride ions are needed to cancel the 2+ charge of magnesium in
magnesium chloride (MgCl2)?
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47.
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Which of the following compounds is NOT a covalent compound?
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For the following questions, type the letter of
the correct answer into the box.
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Figure 20-1
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48.
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What charges are on the sodium (Na) and the chlorine ion (Cl) after the reaction
in Figure 20-1(in the order that they are shown)?
a. 1+ and
1- b. 0 and
1- c. 1- and 1+
d. 0 and 0
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49.
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What happened during the reaction in Figure 20-1?
a. Sodium
gained an electron
c. Chlorine lost 7 electrons
b. Sodium lost an electron
d. nothing happened
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50.
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What type of bond is formed in the Figure above?
a.
covalent b.
metallic c.
ionic d. magical
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Figure 20-2
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51.
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How is the bond formed in Figure 20-2 above?
a. one chlorine takes all
of the electrons. c. both chlorines lose their
electrons.
b. both chlorines share electrons.
d. there is no bond formed.
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52.
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What type of bond is formed in Figure 20-2 above?
a.
magical b.
metallic c.
ionic d. covalent
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