Define the term electrolytic cell - NSC Technical Sciences - Question 5 - 2024 - Paper 2
Question 5
Define the term electrolytic cell.
Write down the NAME or FORMULA of the metal used as the anode.
Which electrode, A or B, is the cathode? Give a reason.
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Worked Solution & Example Answer:Define the term electrolytic cell - NSC Technical Sciences - Question 5 - 2024 - Paper 2
Step 1
Define the term electrolytic cell.
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Answer
An electrolytic cell is an electrochemical cell that converts electrical energy into chemical energy. It facilitates the process of electrolysis, where an electrical current causes a chemical reaction.
Step 2
Write down the NAME or FORMULA of the metal used as the anode.
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Answer
The metal used as the anode is Chromium, represented by the symbol Cr.
Step 3
Which electrode, A or B, is the cathode? Give a reason.
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Answer
Electrode B is the cathode. This is because the cathode is where reduction takes place, which involves the gain of electrons.
Step 4
Write down the half reaction taking place at the following electrodes:
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Answer
The purpose of the power source is to provide electrical energy to drive the electrolysis process. It ensures that the chemical reactions occur at the electrodes.
Step 6
Why is the DC source preferred to the AC source?
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A DC source is preferred because it maintains a consistent polarity, allowing for the continuous flow of electrons towards the electrodes. In contrast, an AC source would cause reversal of current, resulting in alternating electrodes and ineffective electrolysis.
