ELECTROCHEMISTRY

ELECTROCHEMISTRY
Electrochemistry is the study of electricity and how it relates to chemical reactions. In electrochemistry, electricity can be generated by movements of electrons from one element to another in a reaction known as redox reaction, or oxidation-reduction reaction.
EX) Production of jewelry
Batteries
Rust

BASIC BATTERY SET-UP
A source of direct current is connected to a pair of inert electrodes immersed in molten sodium chloride. Because the salt has been heated until it melts, the Na+ ions flow toward the negative electrode and the Cl- ions flow toward the positive electrode.
When Na+ ions collide with the negative electrode, the battery carries a large enough potential to force these ions to pick up electrons to form sodium metal.
Cl- ions that collide with the positive electrode are oxidized to Cl2 gas, which bubbles off at this electrode.

OXIDATION-REDUCTION AND BATTERIES
During discharge an electron is released via an oxidation reaction from a high chemical potential state from the anode (negative) side of the battery. The electron moves through an external circuit to do useful work. Finally, the electron is accepted via a reduction reaction at a lower potential state on the cathode (positive) side of the battery. The current direction is reversed during charging.

CORROSION AND BATTERIES
Corrosion- the process of corroding metal, stone, or other materials.
Batteries contain corrosive chemicals, which causes a chemical reaction to produce electricity. Once you start using the the battery, the chemical process that releases the electricity is similar to the process that causes corrosion. If you stop using the battery, the corrosion continues at a very slow pace.

ELECTROLYSIS
Electrolysis is a method of using a direct electric current to drive an otherwise non-spontaneous chemical reaction.

ELECTROLYSIS EXAMPLES

• Electroplating
• Hair removal.