Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is an ionic compound?
   • A giant structure of ions
2. What do we call the attraction between oppositely charged ions?
   • Electrostatic attraction
3. Describe the structure of a giant ionic lattice.
   • It is a 'lattice' because the arrangement is a regular one and 'giant' because the arrangement is repeated many times with large numbers of ions.
4. What two models can be used to represent giant ionic structures?
   • Ball and stick and charged ion ionic lattice
5. Give a limitation of each the ball and stick model and charged ion ionic lattice models for representing ionic bonds.
   • Ball and stick model: - The ions are actually packed closer together - Gives a false image of bond direction when is only electrostatic attraction Charged ion ionic lattice model: - Difficult to see the arrangement of ions in 3D.
6. Determine the empirical formulae of a compound given the ions: a) Na+ and N3- b) Al3+ and O2-
   • a) Na3N b) Al2O3
7. Draw out a dot cross diagram to show the ionic bond formed in the compound sodium chloride.
   • The sodium ion has an electon pattern of (2,8) and is represented in square brackets with a + charge in the top right corner, as a consequence of having lost an electron from its outer shell. This is then placed next to the chloride ion, which has an electron pattern of (2,8,8) and is also represented in square bracket, but with a - charge in the top right corner, due to it gaining an electron.