DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ1.a |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.3.hl.TZ1.a
EDTA chelates with Ni2+ (aq).
[Ni(H2O)6]2+ (aq) + EDTA4− (aq) [Ni(EDTA)]2− (aq) + 6H2O (l)
Explain how entropy affects this equilibrium.
[2]
Markscheme
entropy increases «and the reaction proceeds to the right» [✔]
more species / free molecules are formed
OR
more ways of distributing energy [✔]
Examiners report
There were several incorrect responses that products were more ordered than the reactants.
