AS Level Chemistry: What are 2 other ways of finding out whether or not a substance has been oxidised or reduced during a chemical reaction

Question

What are 2 other ways of finding out whether or not a substance has been oxidised or reduced during a chemical reaction

Phillanie Jacobs · Accepted Answer

- Electron transfer 
- Change in oxidation number

What are 2 other ways of finding out whether or not a substance has been oxidised or reduced during a chemical reaction