DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ2.a(ii)

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.hl.TZ2.a(ii)
Level hl Paper 2 Time zone TZ2
Command term Explain Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 2]
22M.2.hl.TZ2.a(ii)

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

Explain why there is a large increase from the 8th to the 9th ionization energy of iron.

[2]

Markscheme

Any two of:

IE9: electron in lower energy level
OR
IE9: more stable/full electron level ✔


IE9: electron closer to nucleus
OR
IE9: electron more tightly held by nucleus ✔


IE9: less shielding by «complete» inner levels ✔

Examiners report

Despite some confusion regarding which sub-level the electrons were being removed from, many candidates were able to make at least one valid point, commonly in terms of lower energy/ full sub level/closer to nucleus.

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