Biology II Ch. 2 Testing Yourself and Understanding the Terms in Text
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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An atom that has two electrons in the outer shell would most likely
a. | share to acquire a complete outer shell | b. | lose these two
electrons and become a negatively charged ion | c. | lose these two electrons and become a
positively charged ion | d. | form hydrogen bonds
only |
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2.
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The atomic number tells you the
a. | number of neutrons in the nucleus | c. | weight of the
atom | b. | number of protons in the atom | d. | all of these are
correct |
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3.
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An orbital
a. | has the same volume and charge as a na electron shell | b. | has the same space
and energy content as the energy level | c. | is the volume of space most likely occupied by
an electron | d. | causes an atom to react with another atom |
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4.
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A covalent bond is indicated by
a. | plus and minus charges attached to the atoms | b. | dotted lines between
hydrogen atoms | c. | concentric circles about a nucleus | d. | overlapping electron shells or a straight line
between atomic symbols |
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5.
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An atom has been oxidized when it
a. | combines with oxygen | c. | loses an electron | b. | gains an electron | d. | both a and c are
correct |
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6.
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In which of these are the electrons shared unequally?
a. | double covalent bond | c. | hydrogen bond | b. | triple covalent bond | d. | polar covalent
bond |
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7.
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In the molecule
H
H-C-H
H
a. | all atoms have eight electrons in the outer shell | b. | all atoms are
sharing electrons | c. | carbon could accept more hydrogen
atoms | d. | all of these are correct |
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8.
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Which of these properties of water is not due to hydrogen bonding between water
molecules?
a. | stabilizes temperature inside and outside cell | b. | molecules are
cohesive | c. | is a universal solvent | d. | ice floats on
water |
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9.
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Acids
a. | release hydrogen ions | c. | take up hydroxide ions | b. | have a pH value
above 7 | d. | both A and B are
correct |
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Completion Questions 10-19 are
Understanding the Terms on Page 34
Use the word Bank on Page 34.
Complete each
statement. Must be spelled correctly to
count!
acid
atom compound
hydrogen bond
hydrophilic ion
molecule oxidation pH
scale polar covalent bond
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10.
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A. Bond in which the sharing of electrons between atoms is
unequal.
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11.
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B. Charged particles that carries a negative or positive
charge(s).
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12.
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C. Molecules tending to raise the hydrogen ion concentration in a
solution and to lower its pH numerically.
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13.
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D. Loss of one or more electrons from an atom or molecule; in biological
systems, generally the loss of hydrogen atoms.
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14.
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E. Measurement scale for the hydrogen ion concentration H+ of a
solution.
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15.
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F. Union of two or more atoms of the same element; also the smallest part
of a compound that retains the properties of the compound.
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16.
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G. Smallest particle of an element that displays the properties of the
element.
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17.
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H. Substance having 2 or more different elements united chemically in a
fixed ratio.
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18.
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I. Type of molecule that interacts with water by dissolving in water
and/or by forming hydrogen bonds with water molecules.
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19.
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J. Weak bond that arises between a slightly positive hydrogen atom of one
molecule and a slightly negative atom of another molecule or between parts of the same
molecule.
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