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CHEM1004 Chapter 3 Dr Jason Chan Department of Chemistry
Cathode or Anode? + / ─ ─ ? Electrolysis Cell We break down a compound by electricity
ANODE (+)
CATHODE ( ─ )
Electrochemical Cell We generate electricity by a chemical redox reaction
ANODE ( ─ )
CATHODE (+)
Definition of Cathode & Anode
ANODE
The site of OXIDATION CATHODE
The site of REDUCTION
Electrolysis Cell
loss of electrons
gain of electrons
Cl- ½ Cl2 + 2 eoxidation numbers
-1
ANODE (+)
CATHODE ( ─ )
0
Na+ + e- Na +1
Oxidation
0 Reduction
In the ‘Electrolysis’ slide of Chapter 3:
1. Electrodes Cathode Cathode:: negative electrode (the inert cathode gives out electrons to cations )
The cations cations gains electrons electrons at the cathode cathode..
Anode:: Anode
positive electro trode
(the inert electrode takes in electrons from anions anions)
The anions loses electrons at the anode.
This description only applies to electrolysis (using inert electrodes) NOT to chemical cells.
Electrochemical Cell
loss of electrons
Zn Zn2+ + 2 e0
gain of electrons
ANODE ( ─ )
CATHODE (+)
2+
Cu2+ + 2 e- Cu +2
Oxidation
0 Reduction
Here the electrons are given out at the Anode and taken in at the Cathode. (opposite to electrolysis)
Electrochemical Cell This includes batteries.
Alkaline Batteries
Cathode (+) is a gel of MnO2 & potassium hydroxide(alkali).
Anode (─) is a made of compacted zinc metal powder.
