QUESTION 9 (Start on a new page.)
The diagrams below show two electrochemical cells in which carbon electrodes are used - NSC Physical Sciences - Question 9 - 2021 - Paper 2
Question 9
QUESTION 9 (Start on a new page.)
The diagrams below show two electrochemical cells in which carbon electrodes are used. In cell A, concentrated copper (II) chloride... show full transcript
Worked Solution & Example Answer:QUESTION 9 (Start on a new page.)
The diagrams below show two electrochemical cells in which carbon electrodes are used - NSC Physical Sciences - Question 9 - 2021 - Paper 2
Step 1
What type of electrochemical cell, ELECTROLYTIC or GALVANIC, is shown above? Give a reason for the answer.
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Answer
The type of electrochemical cell shown is an Electrolytic cell. This is evident because the cell requires an external power source to drive the chemical reactions, which convert electrical energy into chemical energy.
Step 2
Half-reaction that takes place at the anode of cell A
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Answer
The half-reaction that occurs at the anode of cell A is:
ightarrow ext{Cl}_2(g) + 2e^-$$
Step 3
Half-reaction that takes place at the cathode of cell B
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The half-reaction that takes place at the cathode of cell B is:
ightarrow ext{Al}(s)$$
Step 4
NAME or FORMULA of the product formed at the cathode of cell A
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The product formed at the cathode of cell A is Chlorine gas, represented by the formula Cl2.
Step 5
Give a reason why the mass of electrode Y decreases after a while.
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Answer
The mass of electrode Y decreases because it undergoes oxidation; metal ions from electrode Y dissolve into the solution, leading to a reduction in its mass over time.
