14. Cu 2 S + O 2 2Cu + SO 2 0 -2 -2 +4 +1 0 O S Cu Oxidised or reduced? reduced oxidised reduced What mass of copper could be obtained by reducing 1kg of copper (I) sulphide?
15. Cu 2 S + O 2 2Cu + SO 2 What mass of copper could be obtained by reducing 1kg of copper (I) sulphide? 160 128 Moles in 1kg 1 mol 2 mol Mass in question Mass in Underline 0.800kg
17. Electrolytic Refining 99.4% 99.98% The copper anodes are already 99.4% copper! The copper cathodes will be 99.98% copper!
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19. e - e - Cu e - e - Anode + - Cathode Cu 2+ Cu 2+ Cu Cu Cu 2+ Cu Cu 2+
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Editor's Notes
What are the most obvious uses for copper – we use it every day. Electrical wiring, plumbing and coins. 15% is recycled copper, the rest is made from reduction of minerals in copper ores.