Question 20N.3.sl.TZ0.13
| Date | November 2020 | Marks available | [Maximum mark: 3] | Reference code | 20N.3.sl.TZ0.13 |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Describe, Outline | Question number | 13 | Adapted from | N/A |
Describe the proper disposal of low-level radioactive waste in hospitals.
[2]
store until material becomes inactive/radiation levels drop ✔
dispose with other waste
OR
dispose in landfills ✔
Only award M2 if M1 correct.
Accept “dispose by incineration” for M2.
Mostly well answered. Some students lost a mark due to not giving a complete answer. In Spanish quite a few students referred to isotopes 'decomposing' and therefore lost their mark.
Outline a green chemistry solution for problems generated by the use of organic solvents.
[1]
«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 ✔
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".
