Nickel-Cadmium Battery

Vocabulary List LEO the lion goes GER Oxidation: an increase in oxidation state (a loss of electrons) Oxidizing agent: electron acceptor, a reactant that accepts electrons from another reactant. Reduction: a decrease in oxidation state (a gain of electrons) Reducing agent: a electron donor, a reactant that donates electrons to another substance to reduce the oxidation state of one of its atoms. Oxidation-reduction (redox) reaction: involves a transfer of electrons from the reducing agent to the oxidizing agent. Anode: the electrode in a galvanic cell at which oxidation occurs. Cathode: the electrode in a galvanic cell at which reduction occurs. Electrode: A device that collects or emits electric charge and controls the movement of electrons. Galvanic cell: consists of at least two half cells, a reduction cell and an oxidation cell. Chemical reactions in the two half-cells provide the energy for the galvanic cell operations. (see fig. 1) Battery: a group of galvanic cells connected in series. Lead- Acid batteries: the anode is lead, the cathode is lead coated with lead dioxide, and the electrolyte is a sulfuric acid solution. Wet-cell batteries: Electrolyte: a material that dissolves in water to give a solution that conducts an electric current. Metallurgy: the process of separating a metal from its ore and preparing it for use.

Chemistry Behind the Battery Note that the anode is the electrode at which oxidation occurs, while the cathode is the electrode at which reduction occurs. Fig. 4: General Electron flow Back- Home - Next