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Chemical reactions can produce electricity - AQA - GCSE Chemistry - Question 3 - 2018 - Paper 1
Question 3
Chemical reactions can produce electricity. Figure 2 shows a simple cell. Which of these combinations would not give a zero reading on the voltmeter in Figure 2? ... show full transcript
Worked Solution & Example Answer:Chemical reactions can produce electricity - AQA - GCSE Chemistry - Question 3 - 2018 - Paper 1
Step 1
Which of these combinations would not give a zero reading on the voltmeter in Figure 2?
Answer
The combination that would not give a zero reading is:
Electrode A: Copper, Electrode B: Zinc, Electrolyte: Sodium chloride solution.
This is because the two different metals (copper and zinc) in conjunction with a conductive electrolyte will produce a potential difference, generating a measurable voltage.