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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
Histidine+/histidine
H2CO3/HCO3-
H2PO4-/HPO42-

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

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

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

methanol
ethanol
butanol
octanol

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

highly reactive
its conjugate acid
its conjugate base
a hydronium ion

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

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

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

carbon atoms
hydrogen bonds
covalent bonds
hydrogen atoms

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