Chemistry C1 AQA GCSE Triple award Part 4
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- Chemistry C1 AQA GCSE Triple Award part 4
- getting metals from rocks
- ores contain enough metal to make extraction worthwhile
- a metal ore is a rock which contains enough metal to make it worth extracting
- in many cases an ore is an oxide of teh metal
- most metals require a chemical reaction to extract them
- the profitability of the metal may change over time
- value goes down
- if the price of metal drops,
- value increases
- if price increases, as technology improves we may be able to extract even more metal
- value goes down
- metals being extracted from their ores chemically
- some ores have to be concentrated before extraction
- this only involves disposing of unwanted rocky matierial
- electrolysis can be used to purify the metal
- some ores have to be concentrated before extraction
- some metals are extracted by reduction with carbon
- when an ore is reduced oxygen is removed
- the position of metal on the reactivity scale determines whether it can be extracted using reduction
- if its higher than carbon you have to use electrolysis
- metals below carbon can be extracted using reduction
- some metals are extracted using electrolysis
- metals that are more reactive than carbon have to be extracted using this
- this is expensive because it uses alot of energy
- copper is purified using electrolysis
- this creates pure copper which is conductive
- alot more expensive than reduction
- reduction creates impure copper which isn't a good conductor
- electrolysis means 'splitting up with electricity'
- electrons are taken away at the (positive) anode and given away at the (negative) cathode
- the electrolytes have free ions which conduct the electricity
- it requires a liquid to conduct electrolysis (electrolytes)
- these are usually metal salt solutions from the ore or molten metal oxides
- electrolysis of copper
- diagram copper electrolysis
- ores contain enough metal to make extraction worthwhile
- getting metals from rocks
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