DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ2.b

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

Lipids provide energy and are an important part of a balanced diet.

Arachidonic acid is a polyunsaturated omega-6 fatty acid found in peanut oil.

Determine the number of carbon–carbon double bonds present if the iodine number for the compound is 334. (Arachidonic acid Mr = 304.5)

[2]

Markscheme

ALTERNATIVE 1

« 334 253.8  =» 1.32 AND « 100 304.5  =» 0.328

« 1.32 0.328  ≈» 4

 

ALTERNATIVE 2

«334 × 304.5 100  ≈» 1017

« 1017 253.8  ≈» 4

 

Award [2] for correct final answer.

[2 marks]

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