DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ2.c

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ2.c
Level hl Paper 2 Time zone TZ2
Command term Describe Question number c Adapted from N/A
c.
[Maximum mark: 1]
22M.2.hl.TZ2.c

Iron(II) disulfide, FeS2, has been mistaken for gold.

Describe the bonding in iron, Fe (s).

[1]

Markscheme

electrostatic attraction/hold between «lattice of» positive ions/cations AND delocalized «valence» electrons ✔

Examiners report

Most candidates knew the bonding in Fe is metallic but some did not “describe” it or missed the type of attraction, a minor mistake; others referred to nuclei or protons instead of cations/positive ions. In some cases, candidates referred too ionic bonding, probably still thinking of FeS2 (not reading the question well). Overall, only 30% answered satisfactorily.

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