DP Chemistry (last assessment 2024)

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Question 20N.3.sl.TZ0.8b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.sl.TZ0.8b
Level sl Paper 3 Time zone TZ0
Command term Justify, Suggest Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.3.sl.TZ0.8b

Biomagnification factor, BMF, can be defined as the concentration of a chemical, X, in a predator, relative to the concentration found in its prey.

BMF=XpredatorXprey, where X=(μg X per kg body weight)

[Franklin, J., 2015. How reliable are field-derived biomagnification factors and trophic magnification factors as
indicators of bioaccumulation potential? Conclusions from a case study on per- and polyfluoroalkyl substances.
Available at: https://setac.onlinelibrary.wiley.com/doi/full/10.1002/ieam.1642.]

 

(b)

Suggest, with a reason, if fat-soluble or water-soluble xenobiotics would have a larger BMF.

[1]

Markscheme

fat-soluble AND pass through lipid membranes/accumulate in cells/fatty tissues
OR
fat-soluble AND less easily excreted/metabolized ✔

Accept “water-soluble” only if an organometallic–protein interaction is mentioned.

Examiners report

A well answered question although some did not give a reason.

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