C7.5 Chemical cells and batteries
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How can you use a difference in the reactivity of metals to make electrical cells and batteries?
➢ If you join 2 metals together by a wire and dip them into an electrolyte - electrons will flow through the wire from zinc to copper
Why is a voltage produced because of the reactivity of the elements?
➢ More reactive metal donates electrons - so it acts as the negative terminal of the cell ➢ The current will flow in the circuit from negative to positive
The greater the difference in the reactivity between the 2 metals used..?
➢ The higher the voltage produced
➢ Why are batteries non-rechargeable?
➢ Once one of the reactants has run out - the cell stops working and should be disposed
What affects the voltage produced in a voltmeter?
➢ Difference in the reactivity of the 2 metals ➢ What type of electrolyte solution there is
How does a rechargeable batter work?
➢ In the recharging process - the battery is connected to a power supply that reverses the reactions that occur at each electrode when the cell is discharging ➢ This regenerates the original reactants