CHEM 1A Chapter 18.1-18.5: Lecture 30 prereading.docx
Document Summary
18. 2 balancing oxidation reduction equations oxidation is loss, reduction is gain balancing use half reaction method one for oxidation, one for reduction, then add acidic solution and basic solution (see examples: oxidation states, separate half reactions, balance half reactions elements other than h and o, o (h2o), then h (h+, balance charge (e , multiply half reactions by appropriate coefficient, add. Redox reactions transfer electrons (cid:224) electrical current e. g. separate zinc atoms and copper ions, force electron transfer to happen through a wire (cid:224) electric current electrochemical cell voltaic (galvanic) cell electrochemical cell that produces electrical current from a spontaneous chemical reaction electrolytic cell electrochemical cell that consumes electrical current to drive a nonspontaneous reaction half cell solid strip of zinc in zn(no3)2 solution; solid strip of copper in cu(no3)2 solution electrodes conductive surfaces through which electrons can enter or leave the half cells.
