DP Chemistry (last assessment 2024)
Question 23M.2.SL.TZ2.a
| Date | May 2023 | Marks available | [Maximum mark: 4] | Reference code | 23M.2.SL.TZ2.a |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Annotate, Describe, Explain, Identify | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 4]
23M.2.SL.TZ2.a
An electrolytic cell was set up using inert electrodes and molten magnesium chloride, MgCl2 (l).
(i)
Identify the product formed at the cathode.
[1]
Markscheme
magnesium/Mg «metal» ✓
Do not accept magnesium ions/Mg2+.
(ii)
Annotate the diagram to show the movement of electrons.
[1]
Markscheme
electron flow from anode to battery OR from battery to cathode ✓
Do not award mark if electrons are shown in electrolyte.
(iii)
Graphite rods are sometimes used as inert electrodes. Describe the structure of graphite and explain why graphite conducts electricity.
[2]
Markscheme
layers «of carbon atoms in a giant structure» ✓
delocalized electrons «flow along layers» ✓
Accept suitable diagram for M1.
Accept two-dimensional network for M1.
Accept electrons are mobile/flow for M2.
