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Water, pH and Macromolecules

Water, pH and Macromolecules
Which of the following acid/base pairs act as natural buffers in living systems?

All of these
H2PO4-/HPO42-
Histidine+/histidine
H2CO3/HCO3-

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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
hydrogen atoms
covalent bonds
carbon atoms

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

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

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

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

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Water, pH and Macromolecules
A Bronsted acid becomes __________ upon losing a proton.

its conjugate acid
a hydronium ion
its conjugate base
highly reactive

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

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

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