DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.d(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ2.d(ii) |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | d(ii) | Adapted from | N/A |
d(ii).
[Maximum mark: 1]
19M.3.hl.TZ2.d(ii)
Proteins have structural or enzyme functions.
Oil spills are a major environmental problem.
Oil spills can be treated with an enzyme mixture to speed up decomposition.
Outline one factor to be considered when assessing the greenness of an enzyme mixture.
[1]
Markscheme
Any one of:
non-hazardous/toxic to the environment/living organisms [✔]
energy requirements «during production» [✔]
quantity/type of waste produced «during production»
OR
atom economy [✔]
safety of process [✔]
Note: Accept “use of solvents/toxic materials «during production»”.
Do not accept “more steps involved”.
Examiners report
The candidates struggled with this part and gave journalistic or vague answers that cannot be awarded marks. Atom economy was mentioned correctly by a few candidates.
