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Unit Objectives Electrochemistry Electrochemistr ochemistr y 3. After studying this Unit, you will be able to describe an electrochemical cell and differentiate between galvanic Chemical reactions can be used to produce electrical energy, conversely, electrical energy can be used to carry out chemical and electrolytic cells ;. reactions that do not proceed spontaneously. apply Nernst equation for calculating the emf of galvanic cell and define standard potential of the cell; Electrochemistry is the study of production of derive relation between standard electricity from energy released during spontaneous potential of the cell, Gibbs energy chemical reactions and the use of electrical energy of cell reaction and its equilibrium to bring about non-spontaneous chemical constant; transformations. The subject is of importance both define resistivity ( ), conductivity for theoretical and practical considerations.

Such a device is called a galvanic or a voltaic cell. If an external opposite potential is applied in the galvanic cell [Fig. 3.2(a)] and increased slowly, we find that the reaction continues to take place till the opposing voltage reaches the value 1.1 V [Fig. 3.2(b)] when, the reaction stops altogether and no current flows through the cell.

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  Cells, Galvanic, Galvanic cell

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