DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ1.c.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ1.c.iii
Level sl Paper 3 Time zone TZ1
Command term Explain Question number c.iii Adapted from N/A
c.iii.
[Maximum mark: 2]
18M.3.sl.TZ1.c.iii

Saturated lipids found in butter and unsaturated lipids found in fish oil readily become rancid.

Explain why sharks and swordfish sometimes contain high concentrations of mercury and polychlorinated biphenyls (PCBs).

[2]

Markscheme

not biodegradable

OR

stored/accumulate in fat

 

biomagnification occurs

OR

concentration increases along food chain

 

Accept “stored/accumulate in bodies of prey/animals eaten”.

Accept “not excreted”.

[2 marks]

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