Why aluminium oxide has high melting point?

This is GCSE question. Answer in the same way please.

Answers:
Unfortunately those are both wrong.

Aluminium Oxide (Al2O3) is an ionic compound [with some covalent character]. For a GCSE answer you need to say:

1. It is made of Al(3+) and O(2-) ions.
2. These form a giant lattice.
3. Ionic bonds are very strong intermolecular forces.
4. These ionic bonds must be broken to melt the compound.

For an 'A'-level anser you would need to describe more. But this is more than enough for GCSE.
aluminium oxide has a high melting point becasue of strong intermolecular forces such as cvalent bonds between aluminium and oxygen. alot of high energy is required to break the bonds, and therefore thats why it has such a high melting point.
Otherwise known as thermite, it's in relation to the strength of the molecular bonds.

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