11: CHAPTER ELECTROCHEMISTRY
ELECTROCHEMISTRY
-The study of the interchange of chemical & electrical energy
OXIDATION- REDUCTION (REDOX) REACTION
-A transfer of electrons from the reducing agent to the oxidizing agent & that oxidation
involves a loss of electrons (an increase in oxidation number) & reduction involves a
gain of electrons (a decrease in oxidation number)
HALF- REACTIONS
-One reaction involving oxidation & the other involving reduction
SALT BRIDGE
-A U-tube filled with an electrolyte
POROUS DISK
-Electrons flow through the wire from reducing agent to oxidizing agent, & ions flow
between the compartments to keep the charge net zero in each.
GALVANIC CELL
-A device in which chemical energy is changed to electrical energy
-Uses spontaneous redox reaction to produce a current that be used to do work
-Consists of an oxidizing agent in one compartment that pulls electrons through a wire
from a reducing agent in the other compartment.
ANODE
-Where oxidation occurs
CATHODE
-Where reduction occurs
CELL POTENTIONAL (ELECTROMOTIVE FORCE- emf)
-The pull or driving force on the electrons
VOLT (V)
-The unit of electrical potential
-1 joule of work per coulomb of charge transferred
VOLTMETER
-Can be used to measure the cell potential
-Draws current through a known resistant