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Water, pH and Macromolecules

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

1014 M
10-7 M
10-14 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 basic
100 times more acidic
2 times more basic
10 times more acidic

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

should act as a good buffer for acids and bases
does not dissolve well in water
contains at least some polar covalent bonds
is probably held together by noncovalent bonds

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

sodium chloride
gasoline (heptanes & octanes)
argon
methane

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Water, pH and Macromolecules
The lone pair electrons on oxygen in a H20 molecule

carry a partial positive charge
carry a partial negative charge
are not important for the properties of water
form covalent bonds in ice

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Water, pH and Macromolecules
The elements oxygen, nitrogen, and carbon

can all form covalent bonds with other elements
are common elements in the molecules that make up living organisms
All of these
contain protons and neutrons in their atomic nuclei

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