a. This material forms crumbly crystals and has a melting point of 16.60 Celsius. It has a low density in solid form. b. This material forms very hard colorless crystals. It does not dissolve in water and burns at high temperatures. c. This material forms colorless crystals that have a melting point of 6610 C. It is hard, brittle, and dissolves well in water. It conducts electricity when dissolved. d. This material conducts electricity, is bendable, but does not dissolve in water or melt easily. It has a slightly dull shiny appearance.

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