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Delgado Biology 141 Final Exam|
Questions With Verified
Answers|Already Graded A+|Score
100%
Oxygen ordinarily has 8 protons and 8 neutrons. Another rare form has 2 extra
neutrons. These 2 forms are:
a) Oxygen ions
b) Oxygen isotopes
c) Oxygen compounds -correct-answer-b) Oxygen isotopes
Which of the following elements' isotopic ratios are used to
make absolute determination of the time of the formation of materials?
a) Oxygen
b) Hydrogen
c) Carbon
D) Nitrogen -correct-answer-c) Carbon
Atoms in which the number of electrons does not equal the number of protons
are known as:
a) Valences
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b) Ions
c) Isotopes
d) Molecules -correct-answer-b) Ions
he area around a nucleus where an electron is most likely to be found is called:
a) Electrical space
b) Energy level
c) Orbital -correct-answer-c) Orbital
Two carbons might be joined to each other by the sharing of two pairs of
electrons, forming a(n)
a) Single bond
b) Ionic bond
c) Double bond
d) Quadruple bond -correct-answer-c) Double bond
Life is thought to have evolved from complex molecules formed by the interaction
of smaller molecules in oceans and the atmosphere. The substance which brought
these molecules together to interact is:
a) Hydrogen
b) Acids
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c) Water
d) Buffers
e) Salts -correct-answer-c) Water
Water molecules are attracted to each other because of the opposite charges
created by partial charge separations within the molecules. These attractions are
called
a) Atomic bonds
b) Covalent bonds
c) Ionic bonds
d) Hydrogen bonds
e) Double bonds -correct-answer-d) Hydrogen bonds
Nonpolar molecules tend to aggregate in water because they are forced to come
into proximity with each other due to:
a) Ionizing interactions
b) Hydrophobic interaction
c) Dissolving interactions
d) Sticky interactions -correct-answer-b) Hydrophobic interaction
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When water ionizes, it produces equal amounts of hydrogen and hydroxide ions,
which can reassociate with each other. Water is thus a(n):
a) Acid
b) Base
c) Alkali
d) Base and an acid
e) buffer -correct-answer-d) Base and an acid
A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The
resulting atoms will be:
a) Ions of nitrogen
b) Positively charged
c) Negatively charged
d) Isotopes of nitrogen
e) New elements with higher atomic numbers -correct-answer-d) Isotopes of
nitrogen
Water is most dense and thus heavier at 4 degrees Centigrade. At zero degrees
Centigrade ice forms and can float on liquid water. Suppose ice were most dense
at zero degrees Centigrade. Select the best explanation of what would happen in
aquatic systems
a) The ice would cover the surface of the aquatic system and
would never melt
Delgado Biology 141 Final Exam|
Questions With Verified
Answers|Already Graded A+|Score
100%
Oxygen ordinarily has 8 protons and 8 neutrons. Another rare form has 2 extra
neutrons. These 2 forms are:
a) Oxygen ions
b) Oxygen isotopes
c) Oxygen compounds -correct-answer-b) Oxygen isotopes
Which of the following elements' isotopic ratios are used to
make absolute determination of the time of the formation of materials?
a) Oxygen
b) Hydrogen
c) Carbon
D) Nitrogen -correct-answer-c) Carbon
Atoms in which the number of electrons does not equal the number of protons
are known as:
a) Valences
,2|Page
b) Ions
c) Isotopes
d) Molecules -correct-answer-b) Ions
he area around a nucleus where an electron is most likely to be found is called:
a) Electrical space
b) Energy level
c) Orbital -correct-answer-c) Orbital
Two carbons might be joined to each other by the sharing of two pairs of
electrons, forming a(n)
a) Single bond
b) Ionic bond
c) Double bond
d) Quadruple bond -correct-answer-c) Double bond
Life is thought to have evolved from complex molecules formed by the interaction
of smaller molecules in oceans and the atmosphere. The substance which brought
these molecules together to interact is:
a) Hydrogen
b) Acids
,3|Page
c) Water
d) Buffers
e) Salts -correct-answer-c) Water
Water molecules are attracted to each other because of the opposite charges
created by partial charge separations within the molecules. These attractions are
called
a) Atomic bonds
b) Covalent bonds
c) Ionic bonds
d) Hydrogen bonds
e) Double bonds -correct-answer-d) Hydrogen bonds
Nonpolar molecules tend to aggregate in water because they are forced to come
into proximity with each other due to:
a) Ionizing interactions
b) Hydrophobic interaction
c) Dissolving interactions
d) Sticky interactions -correct-answer-b) Hydrophobic interaction
, 4|Page
When water ionizes, it produces equal amounts of hydrogen and hydroxide ions,
which can reassociate with each other. Water is thus a(n):
a) Acid
b) Base
c) Alkali
d) Base and an acid
e) buffer -correct-answer-d) Base and an acid
A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The
resulting atoms will be:
a) Ions of nitrogen
b) Positively charged
c) Negatively charged
d) Isotopes of nitrogen
e) New elements with higher atomic numbers -correct-answer-d) Isotopes of
nitrogen
Water is most dense and thus heavier at 4 degrees Centigrade. At zero degrees
Centigrade ice forms and can float on liquid water. Suppose ice were most dense
at zero degrees Centigrade. Select the best explanation of what would happen in
aquatic systems
a) The ice would cover the surface of the aquatic system and
would never melt
