DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ1.b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.hl.TZ1.b |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.2.hl.TZ1.b
The diagram shows an incomplete voltaic cell with a light bulb in the circuit.
Deduce the half-equations for the reaction at each electrode when current flows.
[2]
Markscheme
Positive electrode (cathode):
Ag+(aq) + e– → Ag(s)
Negative electrode (anode):
Mg(s) → Mg2+(aq) + 2e–
Award [1 max] if correct equations given at wrong electrodes.
[2 marks]