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OAT - Chem
Chapter 11 - Redox Rxns and Electrochem
Term | Definition |
---|---|
Electrochemistry | study of relationship btwn chem rxns and electrical E |
Electrochemical rxns | include spontaneous rxns that produce electrical E and nonspontaneous rxns that use electrical E to produce chemical change |
redox rxn | coupled oxidation and reduction rxns occuring simultaneously |
oxidizing agent | gets reduced and causes another atom to be oxidized; NAD+ |
reducing agent | gets oxidized and causes another atom to be reduced; NADH |
Oxidation Numbers | assigned to atoms to keep track of redistribution of e- during chemical rxn |
Electrochemical cells | contained systems where redox rxns occur |
Galvanic Cell | where spontaneous rxns occur; G is negative, energy used to do work |
Electrolytic Cell | where nonspontaneous rxns occur; positive G |
Anode | where oxidation occurs |
Cathode | where reduction occurs |
charge of e- | 1.6E-19 C |
Faraday's Constant | 96,487 C/mol e- |
reduction potential | tendency of a species to acquire e- and be reduced |
standard electromotive force (emf) | difference in potential btwn two half-cells |
If emf is positive | then G is negative, ln K is positive, products are favored, and rxn is spontaneous |