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intramolecular bond
a bond between atoms within molecules
non polar covalent
non metal + non metal
END = 0
polar covalent
non metal + non metal
END =/ 0
properties of giant covalent lattices
made of atoms
high melting points
poor electrical conductors, don’t carry charge (excl graphite)
eg: SiO2, diamond, ceramic
ionic bonds
metals + non metals
NB: ammonium NH4+1 can also form ionic bonds
properties of ionic lattices
made of anions and cations (electrostatic attraction)
high melting points
only conduct when molten (l) or dissolved in water
metallic bonds
metal + metal
sea of free moving delocalised valence electrons between positive kernels
properties of metallic lattices
made of atoms
high melting points
good conductors (free moving electrons that transfer charge)
electrical conductivity
free moving chareged particles (ions or electrons)
ionisation
covalent substances react with water to form an aq solution which allows electrical conductivity
dissociation
ionic substances react with water to form an aq solution which allows electrical conductivity