The PK_a of a Compound Whose Acidic or Basic Form

question 87

Multiple Choice

The pK_a of a compound whose acidic or basic form absorbs UV or visible light can be determined spectroscopically since

• A)l_max always decreases as acidic form is converted to basic.
• B)the pK_a is the same as the pH at which half of the total absorbance increase occurs.
• C)absorbance of the basic form is always twice that of the acidic form.
• D)absorbance of the acidic form is always twice that of the basic form.
• E)delocalization always leads to a decrease in acidity.

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Definitions:

Observational Learning

The act of acquiring behaviors through observation and replication of others.

Classical Conditioning

A method of instruction that occurs by forming associations between a stimulus present in the surroundings and a spontaneously occurring stimulus, culminating in an acquired response.

Operant Conditioning

A strategy of learning wherein the impact of a response is adjusted through the provision of incentives or the application of penalties.

Evolutionary Perspective

An approach in psychology that seeks to explain mental and psychological traits—such as memory, perception, or language—as adaptations, i.e., as the functional products of natural selection.