The table describes the properties of four compounds. Compound Property A B C D Melting Point High Low Low High Boiling point High Low Low High Does the compound dissolve in water? Yes Yes Yes Yes Can the compound conduct electricity? Yes Yes, but poorly. No Yes Which compounds are most likely ionic?

Ionic compounds usually have high melting and boiling points because strong attractions between their ions take substantial energy to overcome. They also conduct electricity when dissolved in water, where their ions can move freely. Compounds A and D have high melting and boiling points and conduct electricity, so the best choice is compounds D and A.

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