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GCSE Chemistry · key term
Melted by heating so that a substance is in the liquid state.
Used by AQA, Edexcel and OCR
Specification 4.2.2.3 · Paper 1
Melted and in the liquid state.
Revise: Ionic Compound PropertiesWhen an ionic compound is molten, enough attractions have been overcome for the lattice arrangement to break down. The positive and negative ions can move through the liquid, so they carry charge and the molten compound conducts.
Specification 1.33, 3.22, 3.25, 3.26 · Paper 1, Paper 2
In the liquid state after being melted by heating.
Revise: Properties of Ionic CompoundsPositive and negative ions can carry charge towards oppositely charged electrodes, so a molten ionic compound conducts electricity.
Melted into a liquid by heating, rather than dissolved in a solvent.
Melted by heating, so that the ions in an ionic compound are free to move.
Specification C3.4b · Paper 1 (Foundation), Paper 3 (Higher)
Changed into the liquid state by heating.
Revise: Molten Electrolysis ProductsThe molten compound therefore acts as an electrolyte.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Changed into the liquid state by heating.
Revise: Products of molten electrolysisThe prediction rule in this lesson applies when the compound is molten and the electrodes are inert, so the electrodes themselves do not provide extra products.
Do not explain conduction by saying that electrons transferred during ion formation are now flowing. In molten ionic compounds and ionic solutions, the moving charge carriers are ions.
Use the state given in the question. Ionic compounds conduct when molten or dissolved in water, but not when solid.
Avoid saying that electrons move through an ionic compound. The mobile charge carriers in molten ionic compounds and their aqueous solutions are ions.
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