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Extraction and Reduction of Metals.
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Extraction and Reduction of Metals Metals are usually obtained from their minerals, by a process called reduction. There are several most common occurring metals found in the earths crust. Most of these are found in the form of minerals or ores. The unreactive metals gold and platinum, and the more reactive metals copper, silver and mercury are found as pure metals in the earths crust. Most other metals are combined with other elements in the form of minerals, such as sodium. When reducing a metal, several factors need to be taken into consideration. These include- * The energy requirements - Metals act as reducing agents, which are oxidised when they donate electrons to other atoms. The energy formation can be worked out from known values. The order from metals which most easily lose electrons, to least easily lose electrons is K Na Ca Mg Al Zn Fe Pb Cu Hg Ag Ti *...
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