DP Chemistry (last assessment 2024)
Question 19M.2.hl.TZ2.4b(iii)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.hl.TZ2.4b(iii) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Predict | Question number | b(iii) | Adapted from | N/A |
b(iii).
[Maximum mark: 2]
19M.2.hl.TZ2.4b(iii)
Rhenium, Re, was the last element with a stable isotope to be isolated.
Before its isolation, scientists predicted the existence of rhenium and some of its properties.
(b(iii))
Predict two other chemical properties you would expect rhenium to have, given its position in the periodic table.
[2]
Markscheme
Any two of:
variable oxidation states [✔]
forms complex ions/compounds [✔]
coloured compounds/ions [✔]
«para»magnetic compounds/ions [✔]
Note: Accept other valid responses related to its chemical metallic properties.
Do not accept “catalytic properties”.
Examiners report
Generally well answered though some students suggested physical properties rather than chemical ones.
