DP Chemistry (last assessment 2024)
Question 20N.3.sl.TZ0.b
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.sl.TZ0.b |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
20N.3.sl.TZ0.b
Outline a green chemistry solution for problems generated by the use of organic solvents.
[1]
Markscheme
«use of» alternative solvents such as supercritical/liquid
Do not accept political or regulatory solutions.
OR
use of water «as solvent»
OR
solvent-free reactions «for example, polymerization of propene»
OR
solid-state chemistry
OR
recycle «waste» solvents
OR
catalysis that leads to better/higher yield
“catalysis” alone not sufficient for mark.
OR
reducing number of steps ✔
Examiners report
Many correct answers. The most common correct answer was using water as a solvent. Some students lost the mark with responses like " less dangerous organic solvents", "alternative solvents (but not giving a specific example)" or "proper disposal of organic solvents".
