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Water, pH and Macromolecules

Water, pH and Macromolecules
Which of the following alcohols would be most soluble in water?

methanol
octanol
ethanol
butanol

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Water, pH and Macromolecules
H2O and CH4 are both examples of

acids
none of these
molecules
ions

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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
is probably held together by noncovalent bonds
should act as a good buffer for acids and bases
contains at least some polar covalent bonds

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Water, pH and Macromolecules
The pH of a solution is determined by

concentration of salt
dielectric constant of the medium
relative concentration of acids and bases
environmental effect

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

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

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

Imidazole
All of these
Indole
Guanidinium ion

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