GCSE AQA Chemistry Combined Science Reactivity of Metals: This is about electrolysis.
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Question

This is about electrolysis.
A student investigates the mass of copper produced during electrolysis of copper chloride solution.
Figure 1 shows the apparatus.

Which gas is produced at the positive electrode (anode)?
Tick one box.

- carbon dioxide
- chlorine
- hydrogen
- oxygen

Copper is produced at the negative electrode (cathode).
What does this tell you about the reactivity of copper?
Tick one box.

- Copper is less reactive than hydrogen.
- Copper is less reactive than oxygen.
- Copper is more reactive than carbon.
- Copper is more reactive than chlorine.

Table 1 shows the student's results.

| Time in mins | Experiment 1 | Experiment 2 | Experiment 3 | Mean |
|--------------|---------------|---------------|---------------|------|
| 1            | 0.60          | 0.58          | 0.62          | 0.60 |
| 2            | 1.17          | 1.22          | 1.21          | 1.20 |
| 3            | 2.40          | 2.41          | 2.39          | 2.40 |
| 5            | 3.02          | X             | 3.01          | 3.06 |

Determine the mean mass of copper produced after 3 minutes.

Mass = ______ mg

Calculate the mass X of copper produced in Experiment 2 after 5 minutes.
Use Table 1 on page 3.

Mass X = ______ mg

The copper chloride solution used in the investigation contained 300 grams per dm³ of solid CuCl₂, dissolved in 1 dm³ of water.
The student used 50 cm³ of copper chloride solution in each experiment.
Calculate the mass of solid copper chloride used in each experiment.

Mass = ______ g

This is about electrolysis - AQA - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 1

Worked Solution & Example Answer:This is about electrolysis - AQA - GCSE Chemistry Combined Science - Question 1 - 2018 - Paper 1

Which gas is produced at the positive electrode (anode)?

What does this tell you about the reactivity of copper?

Determine the mean mass of copper produced after 3 minutes.

Calculate the mass X of copper produced in Experiment 2 after 5 minutes.

Calculate the mass of solid copper chloride used in each experiment.

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