Completion
Complete each
statement.
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1.
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Sodium chloride is an example of a(n) ____________________ because it contains
two or more elements.
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2.
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An ionic compound, salt is a hard, crystalline substance in which the
____________________ and ____________________ ions are lined up in a regular pattern.
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3.
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At the center of an atom is a(n) ____________________ that contains one or more
positively charged ____________________ and neutral ____________________.
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4.
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Electrons that are closest to the atom’s nucleus are in the
____________________ energy level.
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5.
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When two atoms share an electron unevenly and one of the atoms has a slight
negative charge as a result, their bond is referred to as a(n) ____________________.
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6.
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If there is a balanced sharing of electrons and neither atom has a slight
negative or positive charge, their bond is referred to as a(n) ____________________.
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7.
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The chemical formula CO2 represents a molecule that contains one atom
of ____________________ and ____________________ atoms of oxygen.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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8.
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A noble gas has ____.
a. | twice as many neutrons as protons | c. | no nucleus | b. | a stable outer
energy level | d. | an ionic
bond |
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9.
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At the center of an atom is a nucleus containing ____.
a. | molecules | c. | neutrons and electrons | b. | electrons | d. | protons and neutrons |
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10.
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When an atom gains an electron and becomes negatively charged, we refer to it as
a(n) ____.
a. | negative ion | c. | positive ion | b. | electron | d. | molecule |
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11.
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A molecule consisting of two hydrogen atoms joined in a covalent bond would be
written as ____.
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12.
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For a neutral atom of an element, the number of ____ is always the same.
a. | ions and electrons | c. | neutrons and protons | b. | protons and electrons | d. | atoms and
molecules |
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13.
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Removing electrons that are closer to the nucleus takes ____than removing
electrons that are farther away from the nucleus.
a. | more energy | c. | less energy | b. | an equal amount of energy | d. | more time |
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14.
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A sodium atom that is positively charged is written as ____.
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15.
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The bond that forms between atoms when they share electrons is called a(n) ____
bond.
a. | ionic | c. | atomic | b. | covalent | d. | shared |
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16.
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Atoms form ____ with other atoms and become more stable.
a. | chemical bonds | c. | acids | b. | neutrons | d. | bases |
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17.
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An ion is an atom that has ____ or ____ an electron.
a. | shared; lost | c. | borrowed; shared | b. | multiplied; divided | d. | gained; lost |
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18.
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A(n) ____ is a pure substance that contains two or more elements.
a. | molecule | c. | compound | b. | particle | d. | ion |
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19.
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When a positively charged ion and a negatively charged ion are attracted to each
other, the bond they form is referred to as a(n) ____ bond.
a. | ionic | c. | atomic | b. | covalent | d. | shared |
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20.
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When two or more atoms share electrons unevenly, resulting in a positive charge
on one end and a negative charge on the other, they are held together by a(n) ____ bond.
a. | neutral | c. | ionic | b. | polar | d. | nonpolar |
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21.
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A ____ is a covalent bond involving two pairs of electrons.
a. | double bond | c. | single bond | b. | dioxide | d. | double ion |
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22.
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A molecule of carbon monoxide, CO, has ____ atoms.
a. | one | c. | two | b. | fourteen | d. | three |
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23.
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A(n) ____ is a combination of chemical symbols and numbers that tells which
elements are present in a molecule and how many atoms of each element are present.
a. | formula | c. | periodic table | b. | electron dot diagram | d. | elemental chart |
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24.
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A molecule is the neutral particle formed when ____.
a. | an atom is neutral | c. | an atom ionizes | b. | atoms share electrons | d. | atoms share
neutrons |
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Short Answer
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25.
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Describe how electron dot diagrams can be used and why they are helpful.
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26.
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Describe how elements form ions that have a stable atomic structure like that
found in a noble gas. Give at least two examples.
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27.
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Describe what would happen if a positively charged sodium ion and a negatively
charged chlorine ion came into contact.
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28.
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Explain why a stairway is a good model for the energy levels in an atom.
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29.
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How does a polar bond differ from a nonpolar bond?
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Essay
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30.
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What does the formula H2 stand for?
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31.
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Describe the bonds between the hydrogen atoms and the oxygen atom in a water
molecule.
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32.
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Sodium iodide can be added to table salt, sodium chloride, to produce iodized
salt. What do these two compounds have in common?
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33.
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When atoms of nitrogen and oxygen combine, will they form ionic or covalent
bonds? Explain your answer.
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34.
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Why are electrical wires made with metals? Refer to chemical bonds in your
answer.
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