Define the term electrolysis - NSC Technical Sciences - Question 5 - 2020 - Paper 2
Question 5
Define the term electrolysis.
Is the electrolysis of copper(II) chloride a spontaneous or a non-spontaneous reaction?
Explain the answer to QUESTION 5.2.
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Worked Solution & Example Answer:Define the term electrolysis - NSC Technical Sciences - Question 5 - 2020 - Paper 2
Step 1
Define the term electrolysis.
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Answer
Electrolysis is a process in which electrical energy is converted into chemical energy. It involves the decomposition of an ionic substance when an electric current is passed through it.
Step 2
Is the electrolysis of copper(II) chloride a spontaneous or a non-spontaneous reaction?
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Answer
The electrolysis of copper(II) chloride is a non-spontaneous reaction.
Step 3
Explain the answer to QUESTION 5.2.
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Answer
This process requires electrical energy to drive the reaction. It is endothermic, meaning it absorbs energy from its surroundings.
Step 4
Write down the FORMULA of an electrolyte used in the cell above.
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Answer
The formula of the electrolyte is CuCl₂.
Step 5
At which electrode will the following observations be made? Write down only ANODE or CATHODE.
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Answer
5.5.1 CATHODE
5.5.2 ANODE
Step 6
Define the term reducing agent.
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Answer
A reducing agent is a substance that undergoes oxidation, losing electrons in the process.
Step 7
For the cell above, write down the Oxidation half-reaction.
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Answer
2Cl⁻ → Cl₂ + 2e⁻
Step 8
For the cell above, write down the Reduction half-reaction.
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Answer
Cu²⁺ + 2e⁻ → Cu
Step 9
For the cell above, write down the Net reaction.
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