Oxidation
- Oxidation - Gain of oxygen, loss of hydrogen were original observations
- OIL: Oxidation Is Loss of electrons
- Gain in oxidation number
Reduction
- Loss of oxygen, gain of hydrogen were original observations
- RIG: Reduction Is Gain of electrons
- Reduction in oxidation number
Redox
- Redox Reaction: reaction where a species is oxidised, and a species is reduced
- Examples
- Acid metal (metal displaced hydrogen)
- Combustion
- Metal displacement
- Halogen Displacement
- Oxidising agent/Oxidant
- Causes something to be oxidised
- Thus is reduced
- Reducing agent/Reductant
- Causes something to be reduced
- Thus is oxidised
Norrie's rule: Clockwise tendency to spontaneity
Additionally, if the E˚Cell is positive, the reaction is spontaneous
Galvanic cells
- Anode is negative
- Site of oxidation
- Cathode is positive
- Site of reduction
- Salt bridge: completes circuit and prevents buildup of charge
Read up on:
Lechlanche cell Lead-acid accumulator/battery Hydrogen Fuel Cell
Corrosion
- Metals can react with
- Read up on: Rusting of iron
- Prevention
- Scal
- Alloy
- Galvinisation
- Sacrificial anode
- Cathodic protection