DP Chemistry (last assessment 2024)

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Question 19M.3.sl.TZ2.7c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.sl.TZ2.7c
Level sl Paper 3 Time zone TZ2
Command term Predict Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.3.sl.TZ2.7c

Phosphatidylcholine is an example of a phospholipid found in lecithin.

(c)

Predict, giving a reason, the relative energy density of a carbohydrate and a lipid of similar molar mass.

[1]

Markscheme

carbohydrates less energy dense AND carbohydrates higher ratio of oxygen to carbon/more oxidized/less reduced  [✔]

Examiners report

This question was not well answered even though it has appeared on previous tests. In any cases the students did not give the relative energy density or the reason. It is important that candidates read question carefully and responds completely to each question as asked.

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