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Discovery and Extraction of Metals01. We know that iron was one of the earliest metals discovered by man because of the iron age. 02. An ore is a rock that contains enough of a metal for the metal to be worth extracting.03. Potassium, sodium, calcium and magnesium were discovered04. If a metal exists in native form, it exists in nature as that element alone. Only gold and silver are found in native form because of their low reactivity.05. a. Magnetite – iron (III)b. Haematite – iron (III)c. Bauxite –Aluminiumd. Sphalerite – zinc06. Oxygen and sulphur are often combined with metals in ores.07. The extraction of metal is called reduction because in the process electrons are added.08. Carbon is used in the extraction of iron and zinc.09. If carbon displaces iron and zinc from their ores, this shows that carbon is more reactive than iron and zinc.10. This method of extraction cannot be used for either sodium or aluminium because they are too reactive, and will not be displaced by the carbon.
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