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Defining Oxidation and Reduction

Defining Oxidation and Reduction

Redox and Oxidation States

At GCSE, you likely learned the classic acronym OIL RIG: Oxidation Is Loss, Reduction Is Gain of electrons. At A-Level, we expand this definition using oxidation numbers (or oxidation states), which allow us to track electron flow even in complex reactions where oxygen is absent.

Redox Lesson

  1. A Level
  2. /Chemistry
  3. /Redox

Step-by-step lessons on OCR A A Level Chemistry Redox. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.

Lessons