CHEM 253 Study Guide - Reduction Potential, Galvanic Cell, Electrochemical Cell
Document Summary
The cells are of two types: (a) electrolytic cells (b) galvanic cells: a galvanic cell consists of two half cells. Each half cell contains an electrolytic solution and a metallic electrode. the electrode at which- oxidation takes place is called an anode and the electrode at which reduction takes place is called the cathode. The half-cells are separated from each other by means of a porous pot or a salt bridge: the passage of current from one electrode to the other indicates the existence of potential difference between them. Thus, for a redox reaction, cell is positive, g would be negative and reaction would be spontaneous. If e0 cathode e0 cell cell is cell =e0. Unit of r is ohm: resistivity is defined as the resistance of a conductor of 1cm length and having an area of cross-section equal to 1cm2. unit of resistivity is ohm-cm, conductance is reciprocal of resistance, i. e. ,
