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
The concentration of the electrolyte solution.
The temperature 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
Silver
Least reactive: Silver
Step 3
Justify your order of reactivity.
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Answer
The higher the positive voltage, the more reactive the metal.
Magnesium has the highest voltage of +2.71 volts, indicating it is the most reactive. Silver has a negative voltage, which implies that 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
✓ Magnesium and tin
Step 5
Suggest why.
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Answer
Hydrogen fuel cells produce water by reacting hydrogen with oxygen, transforming energy and generating power, similar to traditional steam engines.
