DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ2.b.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.hl.TZ2.b.i
Level hl Paper 3 Time zone TZ2
Command term State and explain Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
18M.3.hl.TZ2.b.i

Vanadium forms a body centred cubic (BCC) crystal structure with an edge length of 303 pm, (303 × 10−12 m).

Vanadium and other transition metals can interfere with cell metabolism.

State and explain one process, other than by creating free radicals, by which transition metals interfere with cell metabolism.

[2]

Markscheme

Any one of these alternatives:

ALTERNATIVE 1

disrupt enzyme binding sites

which can inhibit/over-stimulate enzymes

 

ALTERNATIVE 2

disrupt endocrine system

because they compete for active sites of enzymes/cellular receptors

 

ALTERNATIVE 3

form complexes/coordination compounds

which can bind to enzymes

 

ALTERNATIVE 4

act as oxidizing/reducing agents

OR

act as catalysts

 

which can initiate unwanted reactions

 

Accept “can undergo oxidation–reduction reactions” for M1 in Alternative 4.

[2 marks]

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