CHEM 1062 Chapter Notes - Chapter 21: Oxidizing Agent, Half-Reaction, Electrolytic Cell
Document Summary
Ichapter 21: electrochemistry: chemical change and electric work. Study of the relationship between chemical change and electric work. Electrochemical cells - systems that incorporate a redox reaction to produce or utilize electrical energy. Electrochemical processes involved the movement of electrons from one chemical species to another in a oxidation-reduction reaction. Oxidizing agent does the oxidizing by taking electrons from the substance being oxidized. Reducing agent does the reducing by giving electrons to the substance being reduced. Oxidizing agent is reduced; reducing agent is oxidized. Oxidized substance ends with a higher (more positive) oxidation number. Total number of electrons gained by the oxidizing agent equals the total number lost by the reducing agent. Zn loses electrons, is the reducing agent and is oxidized; on increased from 0 to 2+ H+ gains electrons, is the oxidizing agent and is reduced; on decreased from +1 to 0. Half reaction method for balancing redox reactions. Half reactions reflect actual physical separation in electrochemical cells.
