Amino Acids, Amides and Chirality (OCR A-Level Chemistry A): Quizzes

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Amino acids, amides and chirality
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What is the general formula for an α-amino acid?

RCH(NH2)COOH\text{RCH(NH}_2\text{)COOH}

What does it mean for amino acids to be amphoteric?

They react with both acids and bases

What happens to the amine group when an amino acid reacts with HCl?

It gains a proton to form NH3+\text{NH}_3^+

What ion forms when an amino acid reacts with sodium hydroxide?

RCH(NH2)COONa+\text{RCH(NH}_2\text{)COO}^-\text{Na}^+

What is the amine group in the esterification product of an amino acid with ethanol?

NH3+\text{NH}_3^+

What is the structure of an amino acid zwitterion?

RCH(NH3+)COO\text{RCH(NH}_3^+\text{)COO}^-

What is the net charge of an amino acid at pH above its isoelectric point?

Negative

How is a secondary amide classified?

Two carbons bonded to nitrogen

What defines a chiral centre?

A carbon bonded to four different groups

Why is glycine not chiral?

Its R group is H, giving two H on α-carbon

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