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Electrochemistry (Cell Emf (reactions occur at cathode-anode.,…
Electrochemistry
Cell Emf
reactions occur at cathode-anode.
concentration
Temperature.
1 V = 1 J/C
Oxidation Number Rule
Free element = 0
Monoatomic ion = own charge
Total of oxidation number in neutral molecule = 0
Oxidation and Reduction (Redox)
Reduction
Gain Electron
Dercrease in Oxidation Number
Oxidising Agent
Oxidation
Loses Electron
Increase in Oxidation Number
Reducing Agent
Electrochemical Cell
Voltaic Cell
(Spontaneous)
Anode
Oxidation
Positive
Cathode
Reduction
Negative
Electrolytic cell
(Non-spontaneous)
Cathode
Oxidation
Positive
Anode
Reduction
Negative
Shorthand Notation
Left Hand Side (LHS) - Oxidation (anode)
Right Hand SIde (RHS) - Reduction (cathode)
Standard Reduction Potential
E(cell)=E(cathode) - E(red)
E(cell)=E(reduction) - E(oxidation)
EMF and Free-Energy Change
G =
-nFE