Cells and Batteries

What is an electrochemical cell made up of?

two different electrodes in contact with an electrolyte

Electrolyte

A liquid that contains ions which react with electrodes

What happens in the chemical reactions between the electrodes and the electrolytes?

They set up a charge difference between the electrodes

How is electricity produced via electrodes?

If the electrodes are then connected by a wire, the charge is able to flow - electricity produced

What does the voltage of the cell depend upon?

• Different metals
• Type of electrodes

How do metals change the voltage of the cell?

Different metals react differently with the same electrolyte - causes the charge difference, or the voltage of the cell. The bigger the difference in reactivity of the electrodes, the bigger the voltage of the cell

How do you make a battery?

Connecting two or more cells together in series

What do non - reachable batteries contain?

Cells which use irreversible reactions, once one of the reactants is used up, they don't produce anymore charge and you have to replace them

How do you reverse a reaction in a reachable cell?

By connecting it to an external electric current