Chapter 9 Flashcards

1
Q

amino acid

A

One of 20 building blocks of proteins.

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2
Q

amphiprotic

A

A molecule that can act as both a proton donor and a proton acceptor. The intermediate species of polyprotic acids are amphiprotic.

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3
Q

diprotic acids and bases

A

Compounds that can donate or accept two protons.

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4
Q

hydrolysis

A

“Reaction with water.”

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5
Q

isoelectric focusing

A

A technique in which a sample containing polyprotic molecules is subjected to a strong electric field in a medium with a pH gradient. Each species migrates until it reaches the region of its isoelectric pH. In that region, the molecule has no net charge, ceases to migrate, and remains focused in a narrow band.

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6
Q

isoelectric point

A

The pH at which the average charge of a polyprotic species is 0. Same as isoelectric pH.

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7
Q

isoionic point

A

The pH of a pure solution of a neutral, polyprotic molecule. The only ions present are H+, OH-, and those derived from the polyprotic species. Same as isoionic pH.

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8
Q

polyprotic acids and bases

A

Compound that can donate or accept more than one proton.

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9
Q

speciation

A

Describes the distribution of an element or compound among different chemical forms.

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10
Q

zwitterion

A

A molecule with a positive charge localized at one position and a negative charge localized at another position.

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