EXTRACTION AND USES OF METALS
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most metals are extracted from
the earths crust
unreactive metals are found
in the earths crust as an uncombined element
reactive metals are found
in the earths crust combined with other metals
the tendency to be oxidised is linked to
how reactive a metal is
what metals are less resistant to oxidation
reactive metals
extraction of metals is determined by thier
position in the reactivity series
most reactive metals are extracted by
electrolysis of molten chloride or oxide
is electrolysis expensive and why
yes because large amounts of electricity are needed
what metals are extracted by electrolysis (5)
Potassium (K) Sodium (Na) Calcium (Ca) Magnesium (Mg) Aluminium (Al)
how are lesser reactive metals extracted
by heating with a reducing agent like carbon or carbon monoxide
what metals are extracted by heating with a reducing agent (3)
zinc iron copper
is heating by using a reducing agent expensive and why
NO as carbon is cheap and can be a source of heat
silver and gold are extracted as
pure elements
extraction of a metal from its ore involves
removing oxygen from metal oxides
If the ore contains a metal which is below carbon in the reactivity series then the metal is extracted by
reaction with carbon in a displacement reaction.
The raw material iron core or hematite is used as a source of what metal
iron
coke is used to
provide carbon
limestone is used for
neutralising acidic impurities
uses of aluminium (4)
aircraft bodies saucepans overhead electrical cables food cans
why is aluminium used for food cans
it is non toxic, and resistant to corrosion and acidic food stuffs
why is aluminium used for electrical cables
very good conductor of electricity
why is aluminium used for saucepans
very good conductor of heat and unreactive
uses of copper (3)
electrical wiring saucepans water pipes
why is copper used for electrical wiring
ductile and very good conductor of electricity