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Water, pH and Macromolecules

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

ionic
hydrogen
covalent
noncovalent

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

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

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

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

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

methane
sodium chloride
gasoline (heptanes & octanes)
argon

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Water, pH and Macromolecules
What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?

5 x 10-7
7
7 x 10-7
1 x 10-7

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Water, pH and Macromolecules
Weak acids generally have pKa

that cannot be used to buffer
been seldom found in living systems
values less than 1
pKa values greater than 2

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