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Water, pH and Macromolecules

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

its conjugate base
a hydronium ion
highly reactive
its conjugate acid

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

noncovalent
covalent
ionic
hydrogen

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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?

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

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

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

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Water, pH and Macromolecules
Polyprotic acids such as H3PO4, can act as acid-base buffers

at pH values around any of their pKa's
if their concentration is kept low
only in combination with polyprotic bases
at pH values around neutrality

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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
contain protons and neutrons in their atomic nuclei
All of these

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