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Investigating the laboratory preparation of pure metal Introduction. Malachite, a very popular semi-precious gemstone, is a secondary mineral of copper. It has a characteristic green colour with light green streaks, and is normally opaque. Its hardness varies from 3.5 to 4.0 on the Mohs scale. As a decorative stone, malachite was widely used, especially in Tsarist Russia; the Hermitage museum in St Petersburg contains numerous malachite artefacts (including the famous Malachite Room); and the columns of St Isaac's cathedral in the city were carved from the stone Electrolysis Electrolysis is a process by which electrons are forced through a chemical cell, thus causing a chemical reaction. The positive change usually attracts electrons, and the electrode providing electrons is called cathode, because reduction takes place on it. Positive ions (cations) are attracted to the positive electrode (cathode). Negative ions (anions) are attracted to the positive electrode (anode). Electrolysis causes chemical reactions; amounts of reactants,...

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