Electrolytic Cells Worksheet - Answer Key

 

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  1. How is an electrolytic cell different to a galvanic cell?

    Electrolytic cells use electrical energy to force non-spontaneous reactions forward. 

    2.  

     

  2. What are the units for an Ampere?

    Ampere (Amp) = Coulomb
    second
               

    3.  

  3. What does the term “plating” mean?

    Reduction of a metal ion to a neutral (solid) metal.

    4.  

     

  4. What is a useful equation for solving electrolysis problems?

    I = nF
    t

    5.  

     

  5. How long will it take to plate out 1.0 kg of Al from aqueous AlF3 with a current of 100.0 A?

    29.8 hours                          

    6.  

     

  6. What mass of Cr from molten CrO3 can be produced in 1.0h with a current of 15A?

    4.85 g Cr

    7.  

     

  7. An aqueous solution of an unknown salt of ruthenium is electrolyzed by a current of 2.50 A passing for 50.0 min.  If 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ions in the solution?

    Ru3+                                                               

    8.  

     

  8. Electrolysis of an alkaline earth metal chloride using a current of 5.00 A for 748 seconds plates out 0.471 g of metal at the cathode.  What is the identity of the alkaline earth metal chloride?

    Magnesium

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