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Elements found in the Earth's crust
Metals make up a relatively small proportion of the Earth's crust
and are normally found in rocks as ores
Oxygen 46%
Silicon 28%
Aluminium 8%
Iron 5%
Calcium 4%
Sodium 3%
Magnesium 2%
Potassium 2%
Titanium 0.5%
Hydrogen 0.5%
All other elements1%…read more

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Most metals are found as ores
Bauxite ­ aluminium Haematite ­ iron Malachite ­ copper
oxide (Al2O3) oxide (Fe2O3) carbonate (CuCO3)
ores, contains enough metal to make worthwhile extract the
Some unreactive metals such as gold
can be found as the metal itself ­
chemical separation is not needed.…read more

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The method used to extract a metal from its ore depends on the
reactivity of the metal.
Most K
reactive Na Very reactive metals ­ extracted using
Ca electrolysis
Fe More reactive metals ­ usually extracted by
reduction ­ heating with carbon to remove
Ag Unreactive metals ­ little or no
Au extraction needed
reactive Pt
Sometimes non-metals are included for reference.…read more

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Using the reactivity series, decide which items would be
most corroded.
Gold ring
Iron sword
Copper pin Silver bracelet…read more

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Match the material to the use given the property.
Steel Cast iron Pure Iron…read more

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