Redox Reactions

A “redox” reaction involves the reduction and oxidation of the reactants, thereby changing the oxidation numbers of atoms taking part in the chemical reaction, through an exchange of electrons.
Examples of well-known redox reactions include the rusting of metal, the chemical reaction inside a battery, and combustion of hydrocarbons.

The roaring fire shown to the left is an example of the rapid oxidization of the hydrocarbons making up the wood and the reduction of the Oxygen gas from the air. The, very rusty, Iron hammer to the bottom right is also being oxidized by the Oxygen in the air, but at a much slower rate than the burning wood.