A student investigated the electrical conductivity of sodium chloride. She tested solid sodium chloride and then tested aqueous sodium chloride solution. Which row correctly describes the conductivity results?

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Question

A student investigated the electrical conductivity of sodium chloride. She tested solid sodium chloride and then tested aqueous sodium chloride solution. Which row correctly describes the conductivity results?

Accepted Answer

Solid: does not conduct; Aqueous: conducts — Award 1 mark for identifying that solid ionic compounds do not conduct (ions fixed in lattice) but aqueous solutions conduct (ions free to move). A is incorrect — solid NaCl does not conduct. B is incorrect — aqueous NaCl does conduct. D is incorrect — solid NaCl does not conduct electricity.

Answer

Solid: conducts; Aqueous: does not conduct

Answer

Solid: does not conduct; Aqueous: does not conduct

Answer

Solid: conducts; Aqueous: conducts

Answer

Solid: does not conduct; Aqueous: conducts

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