DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.29
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.29 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 29 | Adapted from | N/A |
29.
[Maximum mark: 1]
19M.1A.SL.TZ2.29
The following reaction occurs in a voltaic (galvanic) cell.
Mg (s) + 2Ag+ (aq) → Mg2+ (aq) + 2Ag (s)
Which reaction takes place at each electrode?
[1]
Markscheme
C
Examiners report
83 % of the candidates were able to identify the electrode equations given the cell reaction. The most commonly chosen distractor B had the correct half-equations at the opposite electrodes.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.5—Oxidation occurs at the anode and reduction occurs at the cathode in electrochemical cells. Identify electrodes as anode and cathode, and identify their signs/polarities in voltaic cells and electrolytic cells, based on the type of reaction occurring at the electrode.