General Chemistry (4th Edition)

Published by University Science Books
ISBN 10: 1891389602
ISBN 13: 978-1-89138-960-3

Chapter 25 Electrochemistry - Problems - Page 974: 68

Answer

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Work Step by Step

$Electrochemical- cell$ $(a)$ A Galvanic cell converts chemical energy into electrical energy. $(b)$ The redox reaction is spontaneous and is responsible for the production of electrical energy. $(c)$The two half-cells are set up in different containers, being connected through the salt bridge or porous partition. $(d)$ The anode is negative and cathode is the positive electrode. The reaction at the anode is oxidation and that at the cathode is reduction. $(e)$The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. $Electrolytic-cell$ $(a)$ An electrolytic cell converts electrical energy into chemical energy. $(b)$ The redox reaction is not spontaneous and electrical energy has to be supplied to initiate the reaction. $(c)$ Both the electrodes are placed in a same container in the solution of molten electrolyte. $(d)$ The anode is positive and cathode is the negative electrode. The reaction at the anode is oxidation and that at the cathode is reduction. $(e)$ The external battery supplies the electrons. They enter through the cathode and come out through the anode.
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