Why do the metals with reactivity cannot be extracted by reduction of oxides
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Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
The metal oxide loses oxygen, and is therefore reduced. The carbon gains oxygen, and is therefore oxidised.
Using iron as an example:
iron oxide + carbon → iron + carbon dioxide
2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)
The source of carbon for this reduction is coke, obtained by heating coal in the absence of oxygen. Note that the iron is liquid when it is formed, due to the very high temperature at which the reaction takes place.
Some metals, such as aluminium, are so reactive that their oxides cannot be reduced by carbon.
The metal oxide loses oxygen, and is therefore reduced. The carbon gains oxygen, and is therefore oxidised.
Using iron as an example:
iron oxide + carbon → iron + carbon dioxide
2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)
The source of carbon for this reduction is coke, obtained by heating coal in the absence of oxygen. Note that the iron is liquid when it is formed, due to the very high temperature at which the reaction takes place.
Some metals, such as aluminium, are so reactive that their oxides cannot be reduced by carbon.
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[BBC - GCSE Bitesize: Extraction using carbon] is good,have a look at it! http://googleweblight.com/i?u=http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/chemicals/extractionmetalsrev1.shtml&hl=en-IN
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Metals are extracted from ores. An ore is a rock that contains enough of a mineral (metal compound) for the metal to be extracted from it. Most metals are extracted from an ore by reduction with carbon or by electrolysis.
Extraction using carbon
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal.
The metal oxide loses oxygen, and is therefore reduced. The carbon gains oxygen, and is therefore oxidised.
Using iron as an example:
iron oxide + carbon → iron + carbon dioxide
2Fe2O3(s) + 3C(s) → 4Fe(l) + 3CO2(g)
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