5.1 Write down the magnitude of the copper charge in CuCl2. 5.2 Define the term electrolysis. 5.3 Is the reaction ENDOTHERMIC or EXOTHERMIC? 5.4 Which electrode is the cathode? Write down only P or Q. 5.5 Write down the observations made at the following electrodes: 5.5.1 P 5.5.2 Q 5.6 Write down a balanced chemical equation for the net cell reaction of the above cell. 5.7 Give a reason why CuCl2 is used in its molten form instead of its solid state.

NSC Technical Sciences Processes and redox reactions taking place in electrolytic cells: 5.1 Write down the magnitude of

5.1 Write down the magnitude of the copper charge in CuCl2 - NSC Technical Sciences - Question 5 - 2022 - Paper 2

Question 5

5.1 Write down the magnitude of the copper charge in CuCl2. 5.2 Define the term electrolysis. 5.3 Is the reaction ENDOTHERMIC or EXOTHERMIC? 5.4 Which electrode i... show full transcript

Worked Solution & Example Answer:5.1 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 copper ions (Cu²⁺) have a valence 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 passes through it.

Step 3

Is the reaction ENDOTHERMIC or EXOTHERMIC?

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Answer

The reaction is EXOTHERMIC because it releases energy in the form of heat during the electrolysis of molten CuCl2.

Step 4

Which electrode is the cathode? Write down only P or Q.

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Answer

Step 5

Write down the observations made at the following electrodes:

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Answer

5.5.1 P: Bubbles form, indicating gas production during electrolysis. 5.5.2 Q: A reddish brown deposit forms, indicating the deposition of copper 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:

$CuCl_2 (l) \rightarrow Cu (s) + Cl_2 (g)$

Step 7

Give a reason why CuCl2 is used in its molten form instead of its solid state.

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Answer

CuCl2 is used in its molten form because, in this state, copper ions are able to move freely, allowing for efficient conduction of electricity.

5.1 Write down the magnitude of the copper charge in CuCl2 - NSC Technical Sciences - Question 5 - 2022 - Paper 2

Worked Solution & Example Answer:5.1 Write down the magnitude of the copper charge in CuCl2 - NSC Technical Sciences - Question 5 - 2022 - Paper 2

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? Write down only P or Q.

Write down the observations made at the following electrodes:

Write down a balanced chemical equation for the net cell reaction of the above cell.

Give a reason why CuCl2 is used in its molten form instead of its solid state.

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