9.4

Galvanic cells (also called voltaic cells)- electrochemical cells which is when spontaneous oxidation-reduction reactions produce electrical energy from chemical energy. They are often used to separate the oxidation-reduction reactions into half-reactions to balance the overall equation.

When a piece of copper is placed in silver nitrate, the copper passes on ions in the solution that is indicated in the blue colour of the solution. The reaction can also be split into half-reactions where they separate oxidation from the reduction.