AS OCR CHEMISTRY ELECTRICAL CONDUCTIVITY AND MELTING POINTS!

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Structure Electrical Conductivity Why?
Giant Covalent structure Doesn't conduct electricity, Does not have delocalised
(Non Metal + Non Metal) apart from graphite. electrons or ions that can move.
Although in graphite the
electrons can move between
layers.
Giant Metallic structure Does conduct electricity Has delocalised electrons that
(Metal) can move
Giant Ionic Structure Solid does not conduct Ions cannot move
(Metal + Non Metal) Liquid does conduct Ions can move
Solution does conduct Ions can move
Simple Molecular Structure Does not conduct electricity Does not have ions or
(Non Metals) delocalised electrons that can
move
Talk about:
The structure
The particles involved (delocalised electrons, ions)
Compare
Structure Melting/Boiling Point Why?
Giant Covalent structure High Strong covalent bonds need a
(Non Metal + Non Metal) lot of energy to
overcome/break
Giant Metallic structure High Strong metallic bonds need a lot
(Metal) of energy to break
Giant Ionic Structure High Strong ionic bonds need a lot of
(Metal + Non Metal) energy to break
Simple Molecular Structure Low Weak intermolecular forces do
(Non Metals) not need a lot of energy to
overcome
Talk about:
Structure
Melting point
Bonds/forces
Energy

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