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Water, pH and Macromolecules

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

methane
gasoline (heptanes & octanes)
sodium chloride
argon

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Water, pH and Macromolecules
Most of the important functional groups in biological molecules contain

oxygen and a phosphate
oxygen and/or nitrogen and are acidic
oxygen and/or nitrogen and are polar
nitrogen and a phosphate

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

is probably held together by noncovalent bonds
does not dissolve well in water
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
Which of the following alcohols would be most soluble in water?

octanol
methanol
butanol
ethanol

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

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

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Water, pH and Macromolecules
The strength of an acid depends on

number of neutrons gain
electronegativity
number of protons released
number of double bonds

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