Question 19M.2.sl.TZ2.b
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.sl.TZ2.b |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Describe | Question number | b | Adapted from | N/A |
Rhenium, Re, was the last element with a stable isotope to be isolated.
Describe how the relative reactivity of rhenium, compared to silver, zinc, and copper, can be established using pieces of rhenium and solutions of these metal sulfates.
[2]
place «pieces of» Re into each solution [✔]
if Re reacts/is coated with metal, that metal is less reactive «than Re» [✔]
Note: Accept other valid observations such as “colour of solution fades” or “solid/metal appears” for “reacts”.
This question was a good discriminator between high-scoring and low-scoring candidates. It was well answered by more than half of the candidates who had obviously carried out such displacement reactions and interpreted the outcomes during the course. Some candidates did not state the obvious of dipping the metal into the sulfates.
