DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ2.15a

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.HL.TZ2.15a
Level HL Paper 2 Time zone TZ2
Command term Explain, Identify, Write Question number a Adapted from N/A
a.
[Maximum mark: 4]
23M.2.HL.TZ2.15a
(a)

Photosynthesis enables green plants to store energy from sunlight as glucose.

(a.i)

Write the equation for photosynthesis.

[1]

Markscheme

6CO2 (g) + 6H2O (l) → C6H12O6 (aq) + 6O2 (g) ✓

(a.ii)

Identify the structural feature that allows chlorophyll to absorb light.
Use section 35 of the data booklet.

[1]

Markscheme

conjugated «electronic» structure/delocalized «pi» electrons/alternate «single and» double bonds ✓

 

Accept “many/delocalized double bonds”.

Do not accept “tetrapyrrole group” alone without reference to idea of conjugation.

(a.iii)

Explain how photosynthesis is being employed to control global warming.

[2]

Markscheme

reduces/sequesters CO2/carbon dioxide «concentration from atmosphere» ✓

«planting» more plants/trees ✓

 

Do not accept “carbon capture” alone for M1.

Do not accept just “plants/trees” alone for M2.