DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ1.a
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.SL.TZ1.a |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
22M.2.SL.TZ1.a
Magnesium can be produced by the electrolysis of molten magnesium chloride.
Write the half-equation for the formation of magnesium.
[1]
Markscheme
Mg2+ + 2 e- → Mg ✔
Do not penalize missing charge on electron.
Accept equation with equilibrium arrows.
Examiners report
Unfortunately, only 40% of the students could write this quite straightforward half equation.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.2—Half-equations separate the processes of oxidation and reduction, showing the loss or gain of electrons. Deduce redox half-equations and equations in acidic or neutral solutions.