DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ1.a(ii)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.sl.TZ1.a(ii) |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | a(ii) | Adapted from | N/A |
a(ii).
[Maximum mark: 2]
19M.3.sl.TZ1.a(ii)
Lithium has many uses.
Explain why lithium is paramagnetic while lithium hydride is diamagnetic by referring to electron configurations.
[2]
Markscheme
lithium has an unpaired electron [✔]
all electrons in lithium hydride are paired [✔]
Note: Award [1 max] for correct electron configurations of Li AND Li+ AND H- without discussion of pairing.
Examiners report
Only a few students were aware of the connection between electron pairing and magnetic properties.
