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3a. If a crystalline solid is hard, has a very high melting point, and is soluble...

3a. If a crystalline solid is hard, has a very high melting point, and is soluble in water, is it covalent, ionic, metallic, or network covalent?

3b. If a crystalline solid is soft, has a moderate melting point, a very high boiling point, and is insoluble in water (but will react with water), is it covalent, ionic, metallic, or network covalent?

3c. If a crystalline solid has a melting point of 35oC, is soluble in polar solvent, and does not conduct an electrical current in the liquid phase, is it covalent, ionic, metallic, or network covalent?

3d. If a crystalline solid is very hard, has a very high melting point, is insoluble, and does not conduct an electrical current, is it covalent, ionic, metallic, or network covalent?

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