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Ionic compounds conduct electricity well once they are:
ADissolved or melted
BCooled below freezing
CGround into a powder
DCompressed into pellets
Answer & Solution
Correct answer: A. Dissolved or melted
1. Conduction needs charge carriers that are free to move.
2. In a solid lattice the ions are locked in place.
3. Once dissolved or melted, ionic compounds are excellent conductors of electricity and heat because the ions can move about freely.
4. Grinding a solid changes its particle size, not the mobility of its ions.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 7 'Chemical Bonding and Molecular Geometry', sections 7.1-7.6_
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