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Extraction of Metals
Unit 2 AQA A Level Chemistry
Metal/Question | Equations/Process/Answer |
---|---|
Iron in the blast furnace | Carbon dioxide formed: C+O2-->CO2 Carbon monoxide formed: CO2+C-->2CO Carbon monoxide reduces the iron oxide: Fe2O3+3CO-->2Fe+3CO2 |
Copper with scrap iron | Cu2+ + Fe ---> Cu + Fe2+ |
Extraction of Tungsten | WO3+3H2-->W+3H2O |
Aluminium electrolysis | -ve electrode: 2Al3+ + 6e- --> 2Al +ve electrode: 3O2- --> 1.5O2 + 6e- Overall equation: Al2O3-->2Al+1.5O2 |
Extraction of Titanium | Titanium oxide to titanium chloride: TiO2+2C+2Cl2-->TiCl4+2CO Liquid titanium chloride distilled then reduced with molten sodium in an argon atmosphere: TiCl4+4Na-->Ti+4NaCl |
How can metals be recycled? | Melting and then reforming into new objects. |
In electrolysis of aluminium, what are the electrodes made from? | +ve is carbon, -ve is steel |
Why do the +ve electrodes in aluminium electrolysis need to be regularly replaced? | Because the oxygen formed there burns the carbon electrode to CO2 |
Converting sulphide ores to oxides | Roasting (heating in air): xS+1.5O2 --> xO+SO2 (x=metal) |
Converting the sulphur dioxide produced in roasting to sulphuric acid | SO2+H2O+0.5O2-->H2SO4 |
Why can titanium or tungsten NOT be extracted using coke? | Brittle carbide forms |
Main cost of electrolysis? | Electricity |
In aluminium electrolysis, what is the aluminium oxide dissolved in and why? | Cryolite, as it has a much lower melting point than pure aluminium oxide |
What is a reducing agent? | Reducing Agents Donate electrons (RAD) |
Copper with coke | 2CuO+C-->2Cu+CO2 |