CHM110H5 Lecture Notes - Redox, Electrochemical Potential, Electroplating
Document Summary
Electrochemical cells - systems that incorporate redox reactions to produce or use electrical energy galvanic voltaic spontaneous redox reaction releases energey, dg <0 system does work on surroudings all batteries. Electrolytic cells external nergy source used to drive non-spontaneous redox reaction, dg >0 surroundings do work on the system electroplating. G = h -ts h = e + pv. = dwelec dg = nfe dg = welec. =charge transferred x potential dg = - n f e n = mol e- transferred. F = charge per mol e- f is a constant e = electrochemical potential. When a cell produces a current, the cell potential is positive and the current can be used to do work. e > 0 for a spontaneous process. Units current - amp amperes time - s seconds potential - v volts. 1c = 1 amp x 1s energy - j joules. 1j = 1 amp x 1s x 1v.
