Copper is sometimes found in ores called pyrites, chakopyrite or peacock ore (se

Question

Copper is sometimes found in ores called pyrites, chakopyrite or peacock ore (see samples). These are much more pure forms of the metal and require less processing than the extraction of the oxidised mineral we have looked at here. a) What method would be used to extract the copper from these ores ___ b) Write a word equation for the process used to extract copper from these ores. ___. Look at your diagram of the electrowinning process drawn on page 4. a) Which electrode became coated in copper? (negative/positive) ___ b) Why would copper ions be attracted to this electrode? ___ c) The process of turning aqueous copper ions into solid copper metal involves electrons. Do copper ions need to gain electrons, lose electrons or share electrons in order to become copper atoms? gain electrons/lose electrons/share electrons Conclusion: Answer the aim of the experiment. ___ Evaluation & Improvements: Identify one part of the method which did not work well. ___ Suggest an improvement which addresses the issue identified. ___

Explanation / Answer

Ans a)

Roasting

Roasting is the process used to extract metals from their concentrated ores , usually pyrites . In this method , the ore is heated in regular supply of air below the melting point of the metal.

b)

The word equation is

Copper sulfide + oxygen ---> cuprous oxide + sulfur dioxide

Information (diagram at page 4) is missing for the next questions ...

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