DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ2.9

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ2.9
Level sl Paper 3 Time zone TZ2
Command term Explain Question number 9 Adapted from N/A
9.
[Maximum mark: 2]
18M.3.sl.TZ2.9

Explain the solubility of vitamins A and C using section 35 of the data booklet.

[2]

Markscheme

Vitamin A:

fat soluble/soluble in non-polar solvents AND non-polar/long hydrocarbon backbone/chain

 

Vitamin C:

water soluble AND contains 4 hydroxyl groups/contains many hydroxyl groups/forms «many» H-bonds with water

 

Accept “Vitamin A: fat soluble/soluble in non-polar solvents as it contains only one hydroxyl group whose H-bonds with water are not strong enough to overcome London/dispersion/vdW forces between Vitamin A molecules”.

Accept “lipid” for “fats”.

Accept “alcohol” OR “hydroxy” OR “OH groups” for “hydroxyl” but not “hydroxide”.

Award [1 max] for “Vitamin A: fat soluble AND Vitamin C: water soluble” with no or incomplete explanation.

[2 marks]

Syllabus sections