15) Solid compound X is hard, has a high melting point, and conducts electricity

Question

15) Solid compound X is hard, has a high melting point, and conducts electricity when dissolved in solution. What type of solid is compound X?

a. Ionic

b. Metallic

c. Covalent network

d. Molecular

16) Why do ionic solids have high melting points?

a. The cations repel the anions during melting.

b. The strong electrostatic interactions between oppositely charged ions require more energy to break.

c. The cations need to gain back electrons from the anions in order to melt.

d. The anions convert the cations into neutral atoms during the melting process.

Explanation / Answer

15. a) ionic

Ionic compounds are hard and brittle and have high melting point as their bonds are very strong. They conduct electricity in molten state because free ions are present.

16. b) The strong electrostatic interactions between oppositely charged ions require more energy to break.

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