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Water, pH and Macromolecules

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

argon
methane
gasoline (heptanes & octanes)
sodium chloride

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

ions
none of these
molecules
acids

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Water, pH and Macromolecules
Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

covalent
hydrogen
noncovalent
ionic

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Water, pH and Macromolecules
If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

It will form a membrane in water
It will be attracted to water
It will act as a buffer and stabilize the pH
be repelled by water

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

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

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

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

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