June 2017 NY Regents Chemistry Exam
39 A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the compound is ionic?
(1) Both the solid and the liquid are good conductors.
(2) Both the solid and the liquid are poor conductors.
(3) The solid is a good conductor, and the liquid is a poor conductor.
(4) The solid is a poor conductor, and the liquid is a good conductor.
Solution: An ionic compound does not conduct electricity in its solid form but can conduct electricity in its liquid form.
Answer: 4
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