silicon dioxide

• What kind of substance is silicon dioxide?

  giant covalent substance
• What is silicon dioxide formed from?

  Silicon and oxygen covalently bonded
• What kind of melting & boiling point does silicon dioxide have?

  high boiling & melting point
• Why does silicon dioxide have a high melting and boiling point?

  as it has a lot of strong covalent bonds which take a lot of energy to break