Chemistry · Oct / Nov 2024 · Paper 42 · Question 6
0620
As printed in the paper
The question as text
Polyamides and polyesters are polymers. Polyamides can occur naturally or can be manufactured.
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6(a)(i)[1]
one amide linkage circled
6(a)(ii)[2]
M1 two fully displayed carboxylic acid groups on the shaded box
M2 two fully displayed amino groups on the unshaded box
6(a)(iii)[1]
water
6(a)(iv)[1]
protein(s)
6(a)(v)[1]
amino acids
6(a)(vi)[3]
displayed formula of 2-aminopropanoic acid (3)
M1 displayed NH2 or displayed COOH group present
M2 displayed NH2 and displayed COOH groups attached to same C atom
M3 correct displayed structure of 2-aminopropanoic acid
6(b)(i)[2]
M1 dicarboxylic acids
M2 diols
6(b)(ii)[3]
M1 any one correct fully displayed ester link between any two blocks
M2 three fully displayed inter-block ester links with correct orientation
M3 fully correct diagram showing two complete repeat units of polyester including continuation bonds
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