CAIE IGCSE Chemistry: Proteins as Natural Polyamides Question Bank

Practise linking proteins to natural polyamides, amino acid monomers, hydrolysis and side-chain formula deductions.

Exam points

state that proteins are natural polyamides made from amino acid monomers
link protein hydrolysis to amino acids and name acids or enzymes as reagents
deduce an R side-chain formula from relative molecular mass and shown atoms

[Maximum number: 2]

Concentrated ammonia solution gives off ammonia gas. Concentrated hydrochloric acid gives off hydrogen chloride gas. Ammonia, $\mathrm{NH}_{3}$ , and hydrogen chloride, HCl , are both colourless gases. Ammonia reacts with hydrogen chloride to make the white solid ammonium chloride.

Apparatus is set up as shown.

Figure for Question 11.8.12—Proteins as natural polyamides and question 1 — CAIE IGCSE Chemistry

After ten minutes a white solid forms in the tube where the gases meet.

(a)

Nylon and proteins are both polymers containing nitrogen.

[ 2 ]

(i)

Describe one difference in the structures of nylon and protein.

[ 1 ]

(ii)

What is the general name given to the products of hydrolysis of proteins?

[ 1 ]

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11.8.12—Proteins as natural polyamides and question 1

Question (a)

Question (i)

Question (ii)