DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ2.13a

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.HL.TZ2.13a
Level HL Paper 2 Time zone TZ2
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.2.HL.TZ2.13a
(a)

Explain in terms of its structure, why β-carotene appears orange in visible white light. Refer to section 17 of the data booklet.

[2]

Markscheme

contains many/multiple conjugated «carbon–carbon/C=C» double bonds
OR
extended system of delocalized electrons ✓

absorbs blue
OR
complementary to orange «light» ✓

 

M1 requires the concept of many or multiple conjugated double bonds in structure for mark.
Do not accept either “conjugation” OR “double bonds” alone for M1.