Covalent Substances

• Describe how covalent bonds form?

  Sharing Electrons between an non-metal and a non-metal
• Explain why simple mecular compounds typically have low melting and boiling points:

  Small molecules have low energy of attraction between molecules
• Describe the structure of a polymer?

  Polymers are a range of materials that are composed of long chains of repeating molecules called monomers.
• Give three examples of giant covalent substances?

  Diamond

  Graphite

  Silicon dioxide (quartz)

  Fullerenes
• Explain why graphite can conduct electricity?

  Delocalised electrons

  Freely move

  Carry charge
• Explain why fullerenes could be used to deliver drugs into the body:

  They are small and can pass through the cell membrane