The electrical conductivity of ionic substances
2 marks · HardState the two conditions under which an ionic compound can conduct electricity.
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When molten (liquid) or dissolved in water (aqueous solution).
Must show: molten, dissolved in water/aqueous solution
Also accept: When melted or liquid; When dissolved in water
Common mistakes: Gases or solids; Mentioning high temperature only with no state
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Marking points
B1 · 1 mark · Correctly states 'when molten'.
B2 · 1 mark · Correctly states 'when dissolved in water' or 'aqueous solution'.
Worked solution
Ionic compounds conduct electricity when they are molten (liquid) or when they are dissolved in water (aqueous solution).