5.5 Chemical cells and batteries
5 exam questions worth 8 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Which pair of metals would give the biggest voltage in a simple cell?
Choose one answer.
Correct Not quite: the answer is Magnesium and copper
Mark scheme
A
Model answer
A: magnesium and copper are furthest apart in the reactivity series.
Describe what is needed to make a simple chemical cell.
Mark scheme
- two different metals / electrodes (1)
- in an electrolyte (1)
Model answer
Two different metals dipping into an electrolyte, joined by a wire.
Explain why a non-rechargeable cell eventually stops producing a voltage.
Mark scheme
- one of the reactants is used up (1)
Model answer
The chemical reaction stops when one of the reactants has been used up.
A torch needs 4.5 V. Each cell gives 1.5 V.
How many cells are needed and how should they be connected?
Mark scheme
- three (1)
- in series (1)
Model answer
Three cells connected in series give 3 × 1.5 = 4.5 V.
Give one advantage and one disadvantage of rechargeable batteries compared with non-rechargeable ones.
Mark scheme
- advantage: can be reused many times / less waste / cheaper in the long run (1)
- disadvantage: more expensive to buy / need recharging / capacity falls over time (1)
Model answer
They can be reused many times, producing less waste, but they cost more to buy and must be recharged.
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