BRAINCAKEIonic Half Equations
Oxidation is the loss of electrons.
Reduction is the gain of electrons.
Redox equations can be separated into two half equations that show the gain and loss of electrons.
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Key terms in this lesson
- Spectator ion
- An ion that is present in a reaction mixture but takes no part in the reaction, remaining unchanged.
- Oxidation
- The addition of oxygen, the removal of hydrogen, the loss of electrons, or an increase in oxidation number.
- Reduction
- The removal of oxygen, the addition of hydrogen, the gain of electrons, or a decrease in oxidation number.
More in Oxidation and Reduction
- Oxidation and Reduction
- Oxidising and Reducing Agents
- Oxidation State
- Rules for Oxidation State
- Working Out Oxidation States
- Superoxide
- Redox Equations
- Redox Reactions in Aqueous Solutions
All 15 lessons in Oxidation and Reduction · All AQA AS-level Chemistry topics