DP Chemistry (last assessment 2024)
Question 19M.3.sl.TZ2.15e
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.sl.TZ2.15e |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | e | Adapted from | N/A |
e.
[Maximum mark: 2]
19M.3.sl.TZ2.15e
A student synthesized aspirin, acetylsalicylic acid, in a school laboratory.
(e)
Outline two factors which must be considered to assess the greenness of any chemical process.
[2]
Markscheme
Any two of:
energy requirements «during production» [✔]
use of toxic materials «during production» [✔]
use of solvents «that are not recycled» [✔]
emission of toxic by-products [✔]
quantity of waste produced
OR
atom economy [✔]
Note: Accept “E-factor/carbon efficiency/% of carbon in reactants vs products” for M1.
Accept references to materials being/not being recycled for M3.
Examiners report
This question was not very well answered by some students. Some students gave vague answers or responses not related to the concept of Green chemistry.
