This definitions covers Key Definitions 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 5 of 11 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
📖 Key Definitions
Electrolysis: The decomposition of an ionic compound (when molten or in solution) by passing electricity through it. Electrical energy is used to break down the compound into its elements.
Molten: Melted — a solid that has been heated until it becomes liquid. Molten ionic compounds can conduct electricity because the ions are free to move.
Reduction: Gain of electrons. Occurs at the cathode during electrolysis. Cations gain electrons and become neutral atoms.
Oxidation: Loss of electrons. Occurs at the anode during electrolysis. Anions lose electrons and become neutral atoms or molecules.
Half equation: An equation showing what happens at one electrode during electrolysis, including the electrons gained or lost. E.g., Pb²⁺ + 2e⁻ → Pb
Electrostatic attraction: The force of attraction between oppositely charged particles (e.g., positive cations attracted to negative cathode).
Practice questions for Electrolysis of Molten Compounds
Which condition is required for electrolysis to occur with an ionic compound?
State the products formed at each electrode when molten lead bromide (PbBr₂) is electrolysed.