Structure

  • Covalent bonding can produce substances that have different structures and therefore different physical properties.
  • We have already seen how small molecules such as H2O and N2 are simple, covalent compounds.
  • These simple compounds consist of molecules which contain fixed numbers of atoms joined together covalently.
  • Giant covalent structures have a huge number of non-metal atoms bonded to other non-metal atoms via strong covalent bonds.
  • Three common macromolecules are diamond, graphite and silicon dioxide.

Properties

  • They have high melting and boiling points as they have many strong covalent bonds.
  • Large amounts of heat energy are needed to overcome these forces and break down bonds.
  • Most cannot conduct electricity as they do not have free electrons nor charged particles but there are some exceptions such as graphite.

AQA GCSE Chemistry Notes

Share with friends

Want to aim for a Level 9?

See if you’ve got what it takes. Test yourself with our topic questions.

Morgan Curtin Chemistry

Author: Morgan

Morgan’s passion for the Periodic Table begun on his 10th birthday when he received his first Chemistry set. After studying the subject at university he went on to become a fully fledged Chemistry teacher, and now works in an international school in Madrid! In his spare time he helps create our fantastic resources to help you ace your exams.