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Water, pH and Macromolecules

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

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

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

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

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

Indole
Imidazole
All of these
Guanidinium ion

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Water, pH and Macromolecules
Which of the following will easily dissolve in a polar solvent?

sodium chloride
argon
methane
gasoline (heptanes & octanes)

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Water, pH and Macromolecules
Weak acids generally have pKa

values less than 1
pKa values greater than 2
that cannot be used to buffer
been seldom found in living systems

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Water, pH and Macromolecules
The reason that fats contain more energy than simple sugars, is fats have many more

hydrogen bonds
carbon atoms
hydrogen atoms
covalent bonds

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