Chemistry Chapter 3 -Part 2

?
View mindmap
  • Chemistry Chapter 3 - Part 2
    • Giant ionic structures
      • Need a lot of energy to break because of strong electrostatic forces between - and + ions
      • Have high melting and boiling points
      • Can conduct electricity when a liquid (molten) but not a solid
        • Ions are free to move around in a liquid
      • Many ionic compounds dissolve in water
        • Can conduct electricity as a solution but not a solid
      • As a solid, particles vibrate but are not free to move around
    • Simple molecules (covalent)
      • Low melting and boiling points
      • Covalent bonds are very strong so atoms within each molecule are tight together
        • However has weak intermolecular forces so do not need much energy to break
      • Do not conduct electricity as there is no overall charge
    • Giant covalent structures
      • Also known as macromolecu-les
      • Examples- diamond, graphite and silicon dioxide
      • Held together by strong covalent bonds so have high melting and boiling points
      • Insoluble in water
      • Hard
      • Do not conduct electricity (except graphite)
      • Graphite
        • No covalent bonds between layers so they slide over each other
        • Has a  free electron (delocalised)
          • Can conduct electricity
        • Hexagonally arranged
    • Fullerenes
      • Hexagonal arrangement
      • Carbon cage-like structure
      • Can deliver drugs to parts of the body

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Structure and bonding resources »