DP Chemistry (last assessment 2024)
Question 18N.3.hl.TZ0.d.iv
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.hl.TZ0.d.iv |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Deduce | Question number | d.iv | Adapted from | N/A |
d.iv.
[Maximum mark: 1]
18N.3.hl.TZ0.d.iv
Chemical energy from redox reactions can be used as a source of electrical energy.
The chemical structure of a photosensitive dye found in blueberries and a schematic diagram of a solar cell are shown.
Deduce the reduction half-equation at the cathode.
[1]
Markscheme
I3– (aq) + 2e– → 3I– (aq) ✔
Accept “3I2 (aq) + 2e– → 2I3– (aq)”.
