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Transition Metals
High Melting point-coloured compounds-high density-used as catalysts
corrosion definition
the oxidation of a metal that weakens the metal
rusting definition
iron reacts with oxygen and water to make hydrated iron oxide (rust)
barrier method
painting, covering in oil or plastic
sacrificial protection
cover in more reactive metal which reacts instead of iron
galvanising
cover in zinc
alloy definition
a mixture of a metal and another metal or non metal element
why are alloys stronger than normal metals
because the layers cant slide
properties of copper
resists corrosion-conducts electricity-malleable
properties of gold
resists corrosion-expensive-shiny
properties of aluminium
resists corrosion-low density
use of copper
to make wires
use of gold
jewellery
use of aluminium
used to make aircraft
metal + acid
salt + hydrogen
metal + water
metal hydroxide +hydrogen
metal + oxygen
metal oxide
more reactive than carbon
use electrolysis to extract
less reactive than carbon
heat with carbon
ore definition
rock that contains enough metal to extract for profit
why heat with carbon
carbon is more reactive and displaces metal from ore
electrolysis disadvantages
uses electricity-uses a lot of energy - costly
bioleaching
bacteria grown on low grade ore and solution of metal ions made, metal extracted with displacement
phyto extraction
grow plants that absorb metal ions, burn plants and extract metal from ash
disadvantage of bio leaching
slow
disadvantage of phyto extraction
expensive
life cycle assesment
getting raw material-manufacturing and packing-using product- disposal
reduction
gain of electrons loss of oxygen
oxidation
loss of electrons gain of oxygen
Note
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