DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ2.14a

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ2.14a
Level HL Paper 2 Time zone TZ2
Command term Identify Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.2.HL.TZ2.14a
(a)

Identify one similarity and one difference between the structures of starch and cellulose.


Similarity: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

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Difference: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

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[2]

Markscheme

Similarity:
polymers of glucose
OR
«1-4» glycosidic «links» ✓

Difference:
starch contains α-glucose AND cellulose contains β-glucose
OR
starch contains α AND cellulose contains β «1-4» glycosidic links
OR
starch «may contain» 1-6 glycosidic links AND cellulose does not
OR
starch «may be» branched AND cellulose unbranched ✓

 

Do not accept “both are polysaccharides” for M1.
Accept alpha or beta for symbols in M2.