This is about electrolysis - AQA - GCSE Chemistry: Combined Science - Question 1 - 2018 - Paper 1
Question 1
This is about electrolysis.
A student investigates the mass of copper produced during electrolysis of copper chloride solution.
Figure 1 shows the apparatus.
Which ... show full transcript
Worked Solution & Example Answer:This is about electrolysis - AQA - GCSE Chemistry: Combined Science - Question 1 - 2018 - Paper 1
Step 1
Which gas is produced at the positive electrode (anode)?
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Answer
The gas produced at the positive electrode (anode) is chlorine.
Step 2
What does this tell you about the reactivity of copper?
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Answer
This indicates that copper is less reactive than hydrogen.
Step 3
Determine the mean mass of copper produced after 3 minutes.
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Answer
The mean mass of copper produced after 3 minutes is 2.40 mg.
Step 4
Calculate the mass X of copper produced in Experiment 2 after 5 minutes.
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From the table, the mass X of copper produced in Experiment 2 after 5 minutes is 3.01 mg.
Step 5
Calculate the mass of solid copper chloride used in each experiment.
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Answer
The mass of solid copper chloride in 50 cm³ of a 300 g/dm³ solution is calculated as follows:
