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Oxidation Number rules
Metal Hydrides (e.g LiH, CaH2): Hydrogen = -1
Peroxides (e.g H2O2): Oxygen is -1
Oxidation (electrons)
Loss of electrons
Oxidation number becomes more positive
Reduction (electrons)
Gain of electrons
Oxidation number becomes more negative
Oxidising agents
Accept electrons from the species that is being oxidised
Therefore gains electrons and is reduced
Reducing Agents
Donate electrons to species being reduced
Therefore loses electrons and is oxidised
Disproportionation reactions
Species is both oxidised and reduced
Both increase and decrease in oxidation number for that species

Redox reactions w/ Metals
Metal + Acid → Salt + Hydrogen