1
BS 161 EXAM 1 NEWEST WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED
ANSWERS|ALREADY GRADED A+/100%
GUARANTEED TO PASS CONCEPTS
Where do lipids, a class of organic compounds, fit on the hierarchy of biological
organization? - (answers)DNA
What are characteristics of an ionic bond? - (answers)An electron is completely
pulled from one atom to another. The electronegativity difference is always
high between atoms of this bond type.
What are characteristics of a covalent bond? - (answers)Atoms of this bond
might have equal electronegativities. This bond may also be polar or nonpolar.
What are the 4 most common elements in living organisms? -
(answers)Carbon, Oxygen, Hydrogen and Nitrogen
What elements are present in trace amounts only? - (answers)Iodine and Zinc
What elements are found in greater than trace amounts? - (answers)Sodium,
Chloride, Calcium, phosphorus, potassium, sulfur, magnesium and iron
The atomic number of carbon-13 is ____ - (answers)6
The atomic mass of carbon-13 is ______ - (answers)13
C-12, C-13, and C-14 have the same number of protons but different numbers
of neutrons so they are ______. - (answers)Isotopes
, 2
Atoms have gained or lost electrons and are no longer electrically neutral are
called _____. - (answers)Ions
Describe a single covalent bond. - (answers)Holds a molecule of hydrogen
together, involves 2 atoms sharing 2 electrons and two chlorine atoms are held
together by this bond.
Describe an Ionic bond. - (answers)Formed by an attraction between atoms
with opposite charges, bond that hold NaCl together, Involves a transfer of one
or more electrons from one atom to another, Leads to the formation of a
crystal lattice rather than distinct molecules and Weakest type of bond shown.
Describe a double covalent bond. - (answers)hold a molecule of oxygen
together, Involves 2 atoms sharing 4 electrons, strongest type of bond shown
and carbon dioxide is held together by this type of bond.
T/F
A water molecule is held together by 2 single polar covalent bond -
(answers)TRUE
T/F
Because oxygen has a greater electronegativity than hydrogen, water
molecules are polar w/ 2 partial negative charges near the oxygen atom and
one partial positive charge near each hydrogen atom. - (answers)TRUE
T/F
Atoms differ in their affinity for neutrons, a property called electronegativity. -
(answers)FALSE
T/F
, 3
In general, electronegativity increases from left to right across each row of the
periodic table and also increases down each column. - (answers)FALSE
T/F
In a nonpolar covalent bond there is an equal sharing of electrons between two
atoms while polar covalent bonds involve an unequal sharing of electrons. -
(answers)TRUE
T/F
A single molecule of Oxygen is held together by 2 double non polar covalent
bonds. - (answers)FALSE
T/F
A covalent bond is formed when 2 atoms share one or more pairs of electrons -
(answers)TRUE
T/F
Polar molecules are electrically neutral but the distribution of charge within the
molecule is not uniform. - (answers)TRUE
T/F
Although C and H differ slightly in electronegativity, this small difference is
negligible and C-H bonds are considered polar. - (answers)FALSE
T/F
Of the 4 most common elements found in living organisms, nitrogen has the
highest electronegativity and therefore, the greatest affinity for electrons. -
(answers)FALSE
BS 161 EXAM 1 NEWEST WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED
ANSWERS|ALREADY GRADED A+/100%
GUARANTEED TO PASS CONCEPTS
Where do lipids, a class of organic compounds, fit on the hierarchy of biological
organization? - (answers)DNA
What are characteristics of an ionic bond? - (answers)An electron is completely
pulled from one atom to another. The electronegativity difference is always
high between atoms of this bond type.
What are characteristics of a covalent bond? - (answers)Atoms of this bond
might have equal electronegativities. This bond may also be polar or nonpolar.
What are the 4 most common elements in living organisms? -
(answers)Carbon, Oxygen, Hydrogen and Nitrogen
What elements are present in trace amounts only? - (answers)Iodine and Zinc
What elements are found in greater than trace amounts? - (answers)Sodium,
Chloride, Calcium, phosphorus, potassium, sulfur, magnesium and iron
The atomic number of carbon-13 is ____ - (answers)6
The atomic mass of carbon-13 is ______ - (answers)13
C-12, C-13, and C-14 have the same number of protons but different numbers
of neutrons so they are ______. - (answers)Isotopes
, 2
Atoms have gained or lost electrons and are no longer electrically neutral are
called _____. - (answers)Ions
Describe a single covalent bond. - (answers)Holds a molecule of hydrogen
together, involves 2 atoms sharing 2 electrons and two chlorine atoms are held
together by this bond.
Describe an Ionic bond. - (answers)Formed by an attraction between atoms
with opposite charges, bond that hold NaCl together, Involves a transfer of one
or more electrons from one atom to another, Leads to the formation of a
crystal lattice rather than distinct molecules and Weakest type of bond shown.
Describe a double covalent bond. - (answers)hold a molecule of oxygen
together, Involves 2 atoms sharing 4 electrons, strongest type of bond shown
and carbon dioxide is held together by this type of bond.
T/F
A water molecule is held together by 2 single polar covalent bond -
(answers)TRUE
T/F
Because oxygen has a greater electronegativity than hydrogen, water
molecules are polar w/ 2 partial negative charges near the oxygen atom and
one partial positive charge near each hydrogen atom. - (answers)TRUE
T/F
Atoms differ in their affinity for neutrons, a property called electronegativity. -
(answers)FALSE
T/F
, 3
In general, electronegativity increases from left to right across each row of the
periodic table and also increases down each column. - (answers)FALSE
T/F
In a nonpolar covalent bond there is an equal sharing of electrons between two
atoms while polar covalent bonds involve an unequal sharing of electrons. -
(answers)TRUE
T/F
A single molecule of Oxygen is held together by 2 double non polar covalent
bonds. - (answers)FALSE
T/F
A covalent bond is formed when 2 atoms share one or more pairs of electrons -
(answers)TRUE
T/F
Polar molecules are electrically neutral but the distribution of charge within the
molecule is not uniform. - (answers)TRUE
T/F
Although C and H differ slightly in electronegativity, this small difference is
negligible and C-H bonds are considered polar. - (answers)FALSE
T/F
Of the 4 most common elements found in living organisms, nitrogen has the
highest electronegativity and therefore, the greatest affinity for electrons. -
(answers)FALSE
