Batteries & Electricity

Batteries act as spontaneous electrochemical cells that help to generate electricity. 

Dry-Cell Batteries

These types of batteries get their names from the fact that they contain very little water. 

Concept: Dry-Cell Batteries

6m

The overall reaction within a typical dry-cell battery is  

Zn (s) + 2 MnO2 (s) + 2 NH4+ (aq) → Zn2+ (aq) + Mn2O3 (s) + 2 NH3 (g) + H2O (l)

Alkaline Batteries

These types of batteries get their names from the fact that they operate within a basic medium. 

Concept: The counterpart to an acidic dry-cell battery is the alkaline battery. 

4m

The overall reaction within a typical alkaline battery is  

Zn (s) + 2 MnO2 (s) + 2 H2O (l) → Zn(OH)2 (s) + 2 MnO(OH) (s)