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Water, pH and Macromolecules

Water, pH and Macromolecules
The dissociation constant of H2O at 25° C is

10-14 M
1014 M
107 M
10-7 M

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Water, pH and Macromolecules
A solution with pH = 5 is __________ than a solution with pH = 7.

10 times more basic
10 times more acidic
2 times more basic
100 times more acidic

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Water, pH and Macromolecules
A compound that is capable of forming hydrogen bonds with water

does not dissolve well in water
contains at least some polar covalent bonds
is probably held together by noncovalent bonds
should act as a good buffer for acids and bases

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

hydrogen
noncovalent
covalent
ionic

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Water, pH and Macromolecules
Which of the following organic groups are found in naturally occuring amino acids?

Imidazole
Guanidinium ion
All of these
Indole

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

only in combination with polyprotic bases
at pH values around neutrality
if their concentration is kept low
at pH values around any of their pKa's

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