Chemistry - C10 Electrochemistry - L1 Oxidation and Reduction

What is a redox reaction? Oxygenways

Oxidation is the addition of oxygen to a substance and Reduction is the removal of oxygen from a substance.

mnemonic bridge OILRIG

Oxidation

Is

Loss of electrons

Reduction

Is

Gain of electrons

What are half equations used for?

To show the loss or the gain of electrons.

Adding Potassium to an unknown substance with a reducing agent

What happens coulourwise?

Solution changes to purple, than fades because of the reducing agent.

Adding Potassium Iodide to Acidified Hydrogen Peroxide

What happens coulourwise?

Solution turns red- brown

Adding Potassium Iodide to Acidified Hydrogen Peroxide

Why does the colour change?

The Potassium Iodide is oxidised by the oxidasing agent and Iodine is formed.