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I can explain why there is a difference in melting/boiling points between simple and giant covalent structures, and use models to show the shapes and structures of covalent substances.
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Molecular modelling represents the bonding and structure of substances.
The way giant covalent structures melt/boil is very different to simple molecules.
Diamond is very hard, has a very high melting point and does not conduct electricity, every atom is bonded to another.
In graphite each atom is bonded to three others to form layers of hexagonal rings. Each atom contributes a free electron
Simple molecules are held together by intermolecular forces, no chemical bonds hold them together.
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