Write down the magnitude of the copper charge in CuCl2 - NSC Technical Sciences - Question 5 - 2022 - Paper 2
Question 5
Write down the magnitude of the copper charge in CuCl2.
Define the term electrolysis.
Is the reaction ENDOTHERMIC or EXOTHERMIC?
Which electrode is the cathode? W... show full transcript
Worked Solution & Example Answer:Write down the magnitude of the copper charge in CuCl2 - NSC Technical Sciences - Question 5 - 2022 - Paper 2
Step 1
Write down the magnitude of the copper charge in CuCl2.
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Answer
The magnitude of the copper charge in CuCl2 is +2, indicating that each copper ion has a charge of +2.
Step 2
Define the term electrolysis.
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Answer
Electrolysis is the chemical process in which electrical energy is converted to chemical energy. It involves the decomposition of a substance when electric current is passing through it.
Step 3
Is the reaction ENDOTHERMIC or EXOTHERMIC?
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Answer
The reaction is EXOTHERMIC because it releases energy during the process.
Step 4
Which electrode is the cathode? Write down only P or Q.
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Answer
P
Step 5
Write down the observations made at the following electrodes:
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Answer
5.1 P: Bubbles form, indicating the production of gas.
5.2 Q: A reddish brown deposit of copper forms on the electrode.
Step 6
Write down a balanced chemical equation for the net cell reaction of the above cell.
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Answer
The balanced chemical equation for the net cell reaction is:
Cu2+(l)+2e−→Cu(s)
Step 7
Give a reason why CuCl2 is used in its molten form instead of its solid state.
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Answer
In molten CuCl2, the ions are able to move freely, allowing electrical current to pass through. Solid CuCl2 does not conduct electricity due to its fixed ionic structure.
