DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.21
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.21 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 21 | Adapted from | N/A |
21.
[Maximum mark: 1]
19M.1A.SL.TZ1.21
Where does oxidation occur in a voltaic cell?
A. positive electrode and anode
B. negative electrode and anode
C. positive electrode and cathode
D. negative electrode and cathode
[1]
Markscheme
B
Examiners report
One G2 form thought the question was awkwardly worded, implying oxidation is occurring in two places rather than one. This question also had a relatively high discriminatory index.
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.