This is about chemical cells - AQA - GCSE Chemistry - Question 6 - 2019 - Paper 1
Question 6
This is about chemical cells.
A student investigated the voltage produced by different chemical cells.
Figure 9 shows the apparatus.
This is the method used.
1. Use... show full transcript
Worked Solution & Example Answer:This is about chemical cells - AQA - GCSE Chemistry - Question 6 - 2019 - Paper 1
Step 1
Suggest two control variables used in this investigation.
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Answer
Temperature of the electrolyte solution.
Concentration of the electrolyte solution.
Step 2
Write the six metals used for electrode X in order of reactivity.
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Answer
Most reactive: Magnesium
Cobalt
Nickel
Tin
Copper
Least reactive: Silver
Step 3
Justify your order of reactivity.
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Answer
The order is justified by observing that metals with higher positive voltages are more reactive. Since magnesium has the highest positive voltage, it is the most reactive. Silver has a negative voltage, indicating it is less reactive than copper.
Step 4
Which of the following pairs of metals would produce the greatest voltage when used as the electrodes in the cell?
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Answer
The correct pair is: Magnesium and tin.
Step 5
Suggest why.
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Answer
Hydrogen fuel cells produce water when hydrogen is oxidised, which can be considered efficient and environmentally friendly, similar to traditional steam trains that utilized water as the primary operational medium.
