Ionic Compound vs Covalent Compound

I found students quite confused over these basic concepts, even though I have shown them computer simulation, diagrams, etc.

Ionic Compound consists of ions.
  • Positively charged ions and negatively charged ions are attracted by strong electrostatic force/ionic bond.

Covalent Compound consists of molecules.
  • Molecules are attracted by weak intermolecular force/van der Waals force.

Therefore, ionic compound
  • has high melting and boiling point
  • can conduct electricity in molten state or aqueus solution.  WHY?
Covalent compound
  • has low melting and boiling point
  • cannot conduct electricity in all state. WHY?

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