Crude copper has many metal impurities (for example, lead, zinc, nickel, and others) and does not conduct electricity well, so ultrapure copper is needed. Explain how you might use an electrochemical cell to purify copper.
This is very easy to find by using http://lmgtfy.com/?q=purifying+copper+by … Whoever teaches you computer studies or Information Technology seems to be totally failing in their job so I've shown you how to do this. You'll find there is simple explanation at http://www.bbc.co.uk/schools/gcsebitesiz … and a more sophisticated diagram at http://wiki.chemeddl.org/index.php/17.2_ …
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