Oxidation and Reduction reactions

Oxidation

The loss of electrons by an element in its free state or an element in a compound

Reduction

The gain of electrons by an element in a compound

A reduction reaction

The removal of oxygen from a metal oxide to form pure metal

Everyday activities for oxidation and reduction

1. Action of bleaches

2. Rusting

3. Browning of cut fruits and vegetables

4. Food preservation

5. The breathalyzer test

Redox reactions

A chemical rection in which one ŕeactant is reduced and the other is oxidised

Oxidation half equation

The equation that only shows the loss of electrons

Reduction half equation

The equation that only shows the gain of electrons

Ionic bonding

Involves a transfer of electrons from the metal atom to the non-metal atom

Oxidation number

Indicates the number of electrons lost, gained or shared as a result of chemical bonding

Sum of oxidation numbers

All elements present in a polyatomic ion is equal to the charge on the ion.

In redox reactions

Oxidation number of one element will increase and the oxidation number of another will decrease

Oxidizing agent

brings about the oxidation of the other reactant

Reducing agent

Brings about the reduction of the other reactant