DP Chemistry (last assessment 2024)

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Question 21M.2.hl.TZ1.1f

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.hl.TZ1.1f
Level hl Paper 2 Time zone TZ1
Command term Explain Question number f Adapted from N/A
f.
[Maximum mark: 2]
21M.2.hl.TZ1.1f

Iron may be extracted from iron (II) sulfide, FeS.

(f)

Explain why the addition of small amounts of carbon to iron makes the metal harder.

[2]

Markscheme

disrupts the regular arrangement «of iron atoms/ions»
OR
carbon different size «to iron atoms/ions» ✔

prevents layers/atoms sliding over each other ✔

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