Chapter 21:
Electrochemistry

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Chapter Objectives


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  1. Describe how a voltaic cell operates, with the concepts of electrodes, salt bridges, half-cell reactions, net cell reaction, and cell diagram.

  2. Describe the standard hydrogen electrode and explain how other standard electrode potentials are related to it.

  3. Use tabulated standard potentials, Eo to determine Eocell for an oxidation-reduction reaction and predict whether the reaction is spontaneous.

  4. Quantitatively and qualitatively predict the effect of varying conditions (concentrations and gas pressures) on values of Ecell.

  5. Know and be able to use the equations that relate [Delta]Go, Eocell, and K.

  6. Describe some common voltaic cells: the flashlight or dry cell, the lead storage battery, the silver-zinc cell, and the fuel cell.

  7. Explain the corrosion of metals in electrochemical terms and describe methods of corrosion protection.

  8. Describe an electrolytic cell and how it differs from a voltaic cell.

  9. Identify the possible half reactions that might occur in an electrolysis and choose the pair that will occur, based on the highest (least negative) cell potential.

  10. Use Faraday's law to relate the quantity of chemical change produced by a given amount of electric charge.


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