Oxidation and Reduction

What is Oxidation and Reduction?

Within Chemistry, which covers atoms, bonding, reactions, the periodic table, organic chemistry and the chemistry of everyday life, this topic explains Oxidation and Reduction. Chemistry links what you can see in the lab to the particles and bonds behind it, so each topic here shows that link in a model.

Check that you can explain Oxidation and Reduction in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Oxidation and Reduction helps you explain why substances behave as they do, from cleaning products and food to medicines.

Oxidation and Reduction in detail

Oxidation is the gain of oxygen or the loss of electrons, and reduction is the loss of oxygen or the gain of electrons, remembered as OIL RIG (oxidation is loss, reduction is gain). They happen together in redox reactions.

In 2Mg + O₂ → 2MgO, magnesium is oxidised, losing two electrons, and oxygen is reduced. Oxidising agents cause others to lose electrons, and reducing agents give electrons. Redox ideas explain combustion, rusting, metal extraction, batteries and bleaching, and half-equations track the electrons.

How the interactive helps you understand Oxidation and Reduction

Watch the reaction model in the interactive. Use any sliders or buttons it offers to change the values and see how the reaction model responds.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Oxidation and Reduction.

Real-life uses and examples

• Link Oxidation and Reduction to everyday products such as cleaning agents, food and medicines.
• Read a chemical equation or diagram and work out what Oxidation and Reduction shows.
• Explain Oxidation and Reduction in an exam by linking the particles involved to what you observe.

Common mistakes to avoid

• Mixing up the names of substances or ions when you describe Oxidation and Reduction.
• Describing what happens without explaining the particles or bonds involved.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.