Electrochemistry

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Electrochemistry basically deals with conversation of  electrical energy to chemical energy & vice-versa.

In These two types of cell ( battery) comes
1) electrolytic cell
2) galvanic cell.

1) electrolytic cell : In this electrical energy is converted into chemical energy. To produce chemical energy the electrical current is passed.
e.g. for electroplating These cells are used.

2) galvanic cell : In this electrical energy is produced due to chemical energy. It is spontaneous process. In this no external electrical energy is supplied.
e.g. lithium ion battery.


In the construction of cells two rods are used
1) Anode - always oxidation occurs
2) cathode - always reduction occurs.

Anode is positive in electrolytic cell
Anode is negative in galvanic cell.
Cathode is negative in electrolytic cell
Cathode is positive in galvanic cell.

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