Practice!

Sample Problem

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

Solution

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.