Amino acids Quiz
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5 questions, one answer each
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1. Which structure is the zwitterion of alanine?
- A. CH₃CH(NH₂)COOH
- B. CH₃CH(⁺NH₃)COO⁻
- C. CH₃CH(NH₂)COO⁻
- D. CH₃CH(⁺NH₃)COOH
2. What is the overall charge on the ion formed when an amino acid is dissolved in dilute hydrochloric acid?
- A. Positive
- B. Negative
- C. Zero
- D. It depends on R
3. Why do amino acids have higher melting points than carboxylic acids of similar Mr?
- A. They have stronger covalent bonds
- B. Zwitterions are held by strong ionic attractions
- C. They contain more carbon atoms
- D. They are fully ionised in the solid as separate ions
4. Which species forms when glycine reacts with aqueous NaOH?
- A. ⁺H₃NCH₂COOH
- B. ⁺H₃NCH₂COO⁻
- C. H₂NCH₂COO⁻
- D. H₂NCH₂COOH
5. A 0.0200 mol sample of amino acid reacts with NaOH. How many mol of NaOH are needed to form the salt?
- A. 0.0100
- B. 0.0200
- C. 0.0400
- D. 0.0600