Define the term electrolysis - NSC Physical Sciences - Question 9 - 2020 - Paper 2
Question 9
Define the term electrolysis.
Which component in the diagram indicates that this is an electrolytic cell?
Write down the NAME or FORMULA of the electrolyte.
How w... show full transcript
Worked Solution & Example Answer:Define the term electrolysis - NSC Physical Sciences - Question 9 - 2020 - Paper 2
Step 1
Define the term electrolysis.
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Answer
Electrolysis is the chemical process in which electrical energy is converted into chemical energy, often used to decompose ionic compounds.
Step 2
Which component in the diagram indicates that this is an electrolytic cell?
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Answer
The battery or power source in the diagram indicates that this is an electrolytic cell.
Step 3
Write down the NAME or FORMULA of the electrolyte.
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Answer
The electrolyte can be silver nitrate (AgNO₃) or silver ethanoate (CH₃COOAg).
Step 4
How will the concentration of the electrolyte change during electroplating?
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Answer
The concentration of the electrolyte will REMAIN THE SAME during electroplating.
Step 5
Give a reason for the answer.
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Answer
The rate of oxidation is equal to the rate of reduction, thus balancing each other out, leading to no change in concentration.
Step 6
Write down the balanced equation of the half-reaction that takes place at the silver electrode.
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Answer
The balanced equation of the half-reaction at the silver electrode is:
