Chemical Basis Of Life Page 2
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1
26.
What is the fundamental difference between covalent and ionic bonding?
a.
In a covalent bond, the partners have identical electronegativity; in an ionic bond, one of
them is more electronegative.
b.
In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner
captures an electron from the other.
c.
In covalent bonding, both partners end up with filled outer electron shells; in ionic
bonding, one partner does and the other does not.
d.
Covalent bonding involves only the outer electron shell; ionic bonding also involves the
next inner electron shell.
e.
Covalent bonds form between atoms of the same element; ionic bonds, between atoms of
different elements.
7.
____________ are weak bonds that are not strong enough to hold atoms together to form
molecules but are strong enough to form bridges between molecules.
a.
Ionic bonds
b.
Covalent bonds
c.
Polar covalent bonds
d.
Hydrogen bonds
e.
Anionic bonds
8.
Why can a glass be filled with water to the point where some of the water is above the
rim of the glass, yet the water does not overflow the glass?
a.
Water molecules exhibit cohesion.
b.
The polar covalent bonds of water prevent overflow.
c.
The ionic bonds of water prevent overflow.
d.
It is an optical illusion, the water is not actually above the rim.
e.
The pressure of gravity on the water prevents overflow.
9.
A solution with a pH of 7 is
a.
strongly acidic
b.
weakly acidic
c.
neutral
d.
weakly basic
e.
strongly basic
10.
A buffer
a.
is an acid that is used to offset overly basic conditions in the body.
b.
is abase that is used to offset overly acidic conditions in the body.
-
-
c.
donates OH
ions when conditions become too acidic and accepts OH
ions when
conditions become too basic.
+
-
d.
donates H
ions when conditions become too basic and accepts OH
ions when conditions
become too acidic.
-
-
e.
donates OH
ions when conditions become too basic and accepts OH
ions when
conditions become too acidic.
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