ElectrolysisKey Facts

Key Facts to Memorise

Part of Electrolysis of Molten Compounds · GCSE GCSE Chemistry revision

This key facts covers Key Facts to Memorise within Electrolysis of Molten Compounds for GCSE Chemistry. Revise Electrolysis of Molten Compounds in Electrolysis for GCSE Chemistry with 21 exam-style questions and 14 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 6 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 6 of 11

Practice

21 questions

Recall

14 flashcards

📌 Key Facts to Memorise

Solid ionic compounds DON'T conduct — ions are locked in fixed positions in the lattice and cannot move
Molten ionic compounds DO conduct — ions are free to move and carry charge to the electrodes
CATHODE (−): Attracts positive ions → cations GAIN electrons → METAL forms (this is REDUCTION)
ANODE (+): Attracts negative ions → anions LOSE electrons → NON-METAL forms (this is OXIDATION)
Molten = simple prediction: Only 2 types of ion present → metal at cathode, non-metal at anode
PbBr₂ products: Lead metal at cathode (silvery), Bromine gas at anode (orange/brown)
NaCl products: Sodium metal at cathode (silvery), Chlorine gas at anode (green/yellow)
MgCl₂ products: Magnesium metal at cathode, Chlorine gas at anode
Memory trick: CATions → CAThode; Reduction at Cathode (both have C); ANions → ANode

Quick Check: Why must an ionic compound be molten (or in solution) for electrolysis to work?

Keep building this topic

Read this section alongside the surrounding pages in Electrolysis of Molten Compounds. That gives you the full topic sequence instead of a single isolated revision point.

Key Definitions Common Misconceptions Breaking Free — The Prison Break of Ions Electrolysis Cell — Click to Explore

Practice Questions for Electrolysis of Molten Compounds

Which condition is required for electrolysis to occur with an ionic compound?

A. The ions must be free to move (molten or in solution)
B. The compound must be dissolved in organic solvent
C. The compound must be heated above 1000 °C
D. The compound must contain metallic bonds

1 markfoundation

State the products formed at each electrode when molten lead bromide (PbBr₂) is electrolysed.

2 marksstandard

Quick Recall Flashcards

Why does solid lead bromide NOT conduct electricity?

In the solid state, all ions (Pb²⁺ and Br⁻) are held in fixed positions in the ionic lattice by strong electrostatic forces. They cannot move, so they cannot carry electrical charge.

How do you remember that cations go to the cathode?

CATions → CAThode (both start with CAT) ANions → ANode (both start with AN) Metal at the Minus (cathode is negative), Non-metal at the Plus (anode is positive).

21 questions on Electrolysis of Molten Compounds — practise free

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Key Definitions

Common Misconceptions