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picture1_Extraction Of Copper Pdf 180531 | Q Extractcu


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File: Extraction Of Copper Pdf 180531 | Q Extractcu
chemguide questions extraction of metals copper 1 if your syllabus doesn t expect you to be able to describe the extraction of copper from its ores then ignore this question ...

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             Chemguide – questions
                                        EXTRACTION OF METALS: COPPER
         1.  If your syllabus doesn't expect you to be able to describe the extraction of copper from its ores, then 
             ignore this question.
             In the extraction of copper from chalcopyrite, CuFeS , the ore is first concentrated by froth 
                                                                      2
             floatation, and then heated in a furnace or series of furnaces with a mixture of silicon dioxide, 
             calcium carbonate and air or oxygen.  The overall equation can be considered as
                     2CuFeS   +  2SiO   +  4O                   CuS  +  2FeSiO   +  3SO
                             2          2       2                  2             3         2
             The Cu S is converted into copper using a blast of air.
                     2
             a) Describe briefly and without details what you understand by “froth floatation”.
             b) How does the FeSiO  separate from the Cu S?
                                      3                       2
             c) What happens to the SO ?
                                          2
             d) Write the equation for the reaction of CuS  with the final blast of air.
                                                             2
             e) The equation you have written in part (d) is a redox reaction.  What is the reducing agent? 
             Explain your answer.
             f) Some copper ores can be turned into copper by a process which involves a chemical reaction in 
             the cold, for example with dilute sulphuric acid.  In that case, you are left with copper(II) sulphate 
             solution which can be concentrated, and then electrolysed.
                     (i) What could you use as the anode?
                     (ii) What could you use for the cathode?
                     (iii) Write the cathode equation.
         2.  In the purification of copper, the impure copper is made the anode in an electrolysis of copper(II) 
             sulphate solution.
             a) State what the cathode made of, and write the cathode equation.
             b) Write the main anode equation.
             c) Explain what happens to metals like zinc which may be present in the impure copper, and which 
             are above copper in the electrochemical series.
             d) Explain what happens to metals like gold and silver which may be present in the impure copper.
             e) The copper(II) sulphate solution has to be continuously purified.  Explain why.
             www.chemguide.co.uk
             Chemguide – questions
         3.  Give two different uses for copper, and explain why copper is used in each situation.
             www.chemguide.co.uk
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...Chemguide questions extraction of metals copper if your syllabus doesn t expect you to be able describe the from its ores then ignore this question in chalcopyrite cufes ore is first concentrated by froth floatation and heated a furnace or series furnaces with mixture silicon dioxide calcium carbonate air oxygen overall equation can considered as sio o cus fesio so cu s converted into using blast briefly without details what understand b how does separate c happens d write for reaction final e have written part redox reducing agent explain answer f some turned process which involves chemical cold example dilute sulphuric acid that case are left ii sulphate solution electrolysed i could use anode cathode iii purification impure made an electrolysis state main like zinc may present above electrochemical gold silver has continuously purified why www co uk give two different uses used each situation...

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