Edexcel IAL Chemistry AS 8.2 Oxidation numbers in compounds and ions
Edexcel IAL Chemistry AS 8.2 Oxidation numbers in compounds and ions
Assign the fixed values first, include every formula subscript and set the weighted sum equal to the species charge before comparing initial and final states.
How this is tested
- Calculate oxidation numbers in ions, peroxides, metal hydrides and complexes.
- Order species by one element's oxidation number or identify equal oxidation states.
- Determine oxidation-number changes for each named element across a reaction.