In depth and simple to understand class notes taken over the course of 2 years in a highly accredited IB school for Chemistry HL, in regards to the topic of redox
This includes diagrams, annotations, extensive notes and explanations and they are the notes that have solely led me to an IB 7 in HL ...
Sum of oxidation number for a Polyatomic ion: ion charge MnO4- = -1 Cr2O72- = -2
Sum of oxidation number for a neutral compound: 0 CH4 = 0 KMnO4 = 0
- For writing
- Charge = 3+
- Oxidation state = +3
- Oxidation number = 3
, Reduction and oxidation
1st definition (Traditional definition)
- Gain in oxygen or loss in hydrogen is oxidation
- Reduction is loss of oxygen or gain of hydrogen
2nd definition
- Oxidation is loss of the electrons (atom gets more positive)
- Reduction is gaining electrons (atom gets more negative)
3rd definition
- Increase in oxidation number is oxidation
- Decrease in oxidation number is reduction
Oxidation and reduction agents
- Oxidation agent causes oxidation, reduction agent causes reduction
- The compound undergoing oxidation is the reducing agent
- The compound undergoing reduction is the oxidation agent
• Identify the oxidising and reducing agents in the following equation.
2Al + 3PbCl2 → 2AlCl3 + 3Pb
Look at reduction and oxidation sheet
Disproportionation reaction:
Reaction where the same type of atom is oxidised and reduced
Eg. CO2 + C → 2CO
Carbon both reduced and increased
Usually, double displacement reaction is not redox, no changes in oxidation state
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