DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.5c
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ2.5c |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Describe | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
22M.2.hl.TZ2.5c
Iron(II) disulfide, FeS2, has been mistaken for gold.
(c)
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.
