DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ1.a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ1.a
Level hl Paper 3 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.3.hl.TZ1.a

Carotenoids are pigments found in leaves.

The absorption spectrum of β-carotene is shown below.

Explain its colour in terms of its absorption bands. Use section 17 of the data booklet.

[2]

Markscheme

400–424 «nm» absorption band/violet AND 424–490 «nm» absorption band/blue    [✔]

complementary/opposite colour observed
OR
yellow/orange observed    [✔]

 

Note: Accept “400–500 «nm» absorption band” for M1.

Examiners report

Very few candidates scored the first mark. Two absorption bands were required but most candidates only mentioned one. However, most candidates scored the second mark for stating the colour of β-carotene.

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