IB Chemistry HL 3.2.8 Electrolytic cells Question Bank
Practise IB Chemistry HL 3.2.8 by applying electrolytic cells to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Chemistry HL
- Level
- HL
Exam points
- identify the relevant chemical structure, process or evidence
- apply the correct chemical model or equation
- evaluate the result using chemical reasoning and data
3.2.8—Electrolytic cells question 1
[Maximum number: 2]
Magnesium is a group 2 metal which exists as a number of isotopes and forms many compounds.
Magnesium chloride can be electrolysed.
Deduce the half-equations for the reactions at each electrode when molten magnesium chloride is electrolysed, showing the state symbols of the products. The melting points of magnesium and magnesium chloride are 922 K and 987 K respectively.
Anode (positive electrode):
Cathode (negative electrode):
Anode (positive electrode):
2 Cl^- Cl_2( g)+2 e^-
Cathode (negative electrode):
Mg^2++2 e^- Mg(l)
Penalize missing/incorrect state symbols at Cl_2 and Mg once only.
Marking guidance:
Award [1 max] if equations are at wrong electrodes.
Accept Mg(g).
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