Which of the following properties characterize covalent crystal? (Choose all that apply.)
Low melting point
High boiling point
Conductors of electricity and heat
Most are insoluble in water
Network covalent bond is very strong, so covalent crystal has a high melting point and a high boiling point. Covalent crystals are nonelectrolytes, so they do not conduct electricity. Most of the covalent crystals are insoluble in water.