4.5.2.1 Cells and batteries

how to produce electricity

put two different metals and place them into an electrolyte

(a solution hat can conduct electricity)

what is an electrical chemical cell

* A​ ​simple​ ​cell​ ​can​ ​be​ ​made​ ​by​ ​connecting​ ​two​ ​different​ ​metals​ ​in​ ​contact​ ​with​ ​an

electrolyte

properties of cells

cells can only produce electricity for a certain period of time the chemicals in the cell run out and the reaction stops

can only produce electricity if metals with different reactivities are used

relationship between reactivity and pd

the greater the difference in reactivity in metals the larger the pd produced by cell

What is voltage is dependent

The voltage produced by a cell is dependent upon a number of factors including the type of electrode and electrolyte.

how can a simple cell be made

can be made by connecting two different metals in contact with an electrolyte.

what is a battery

contains two or more cells connected in series to produces a greater voltage

 Non-rechargeable​ ​cells​ ​&​ ​batteries:

o Chemical​ ​reactions​ ​stop​ ​when​ ​one​ ​of​ ​the​ ​reactants​ ​has​ ​been​ ​used​ ​up

cannot be reversed therefore non-non-rechargable

o Alkaline​ ​batteries​ ​are​ ​non-rechargeable

Rechargeable​ ​cells​ ​&​ ​batteries:

o Can​ ​be​ ​recharged​ ​because​ ​the​ ​chemical​ ​reactions​ ​are​ ​reversed​ ​when​ ​an external​ ​electrical​ ​current​ ​is​ ​supplied

simple cell appratus

copper electrode

copper sulfate solution

zinc electrode

zinc sulphate solution

saltbridge