AuSampleQuestion - This process is controversial due to the...

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Practice Question: One of the most dominate methods of mining gold in the modern era is known as cyanide leach mining or the MacArthur-Forrest Process. This method of mining involves running a solution of sodium cyanide (NaCN) through a sample of gold ore. As the sodium cyanide comes in contact with the gold, it reacts to form Gold (III) Cyanide, which is aqueous. This solution is then collected in large vats. This solution of Gold (III) cyanide is then reacted with solid iron (usually scrap iron in the form of Iron (III)). Using your reactivity table and your understanding of chemical reactions, write an equation for the reaction of Gold (III) Cyanide and Iron.
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Unformatted text preview: This process is controversial, due to the highly toxic nature of cyanide. However, free cyanide breaks down rapidly when exposed to sunlight, although the less toxic compounds such as cyanates and thiocyanates may persist for some years. Cyanide disasters tend not to kill many people, as humans can be warned not to drink or go near polluted water. However cyanide spills can have a devastating effect on rivers, killing everything for several miles downstream. Fish are the most obvious casualties, but in fact the whole food chain collapses, from phytoplankton to ospreys....
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