DP Chemistry (first assessment 2025)
Question 22N.1A.SL.TZ0.23
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.SL.TZ0.23 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | State | Question number | 23 | Adapted from | N/A |
23.
[Maximum mark: 1]
22N.1A.SL.TZ0.23
Which combination is correct regarding the anode and electron flow in an electrolytic cell?
[1]
Markscheme
A
Examiners report
51% of the candidates deduced the polarity of the anode and the direction of the flow of electrons in an electrolytic cell correctly. The question had good discrimination between high-scoring and low-scoring candidates.
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.
Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.4—Le Châtelier’s principle enables the prediction of the qualitative effects of changes in concentration, temperature and pressure to a system at equilibrium. Apply Le Ch.telier’s principle to predict and explain responses to changes of systems at equilibrium.