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C5 (Cells and batteries (Chemical reactions in a cell produce electricity,…
C5
Cells and batteries
Chemical reactions in a cell produce electricity
An electrochemical cell is a basic system made up of two different electrodes
To work they have to be in contact with an electrolyte solution
The voltage of a cell depends on many factors
Different metals will react differently electrolyte
In non rechargeable batteries the reactants get used up
Exothermic and endothermic
Endothermic reaction take in energy and heat
citric acid + sodium hydrocarbonate
Thermal decomposition
Exothermic reactions energy is given off
combustion is burning fuels which gives a lot of energy and heat
Neutralisation reaction acid + alkali gives energy
Bond energies
Every reaction has a calculation to go with it bond energies are used
energy must be supplied to break bonds
endothermic reactions energy is supplied and bond are broken
Exothermic energy is released to form bonds