[QUOTE=:)Esss[excludedFace]smile[/excludedFace];77230004]um ok so do intermolecular bonds break or covalent bonds?
Its the strong covalent bonds that need to be broken and this needs a high amount of energy. The intermolecular forces still need to be overcome, but this doesn't need much energy at all. The high temperatures are needed to break the actual bond.
If feel like if you do a level chemistry, a lot of this will clear up.
But just remember for macromolecular structures the covalent bonds need to be broken.
However in simple molecular structures, the intermolecular forces need to be broken- not the bonds. This is because the subunits of simple covalent structures exist as molecules, unlike atoms for macromolecular structures, therefore the intermolecular forces are only needed to melt it.