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4. (a) Which row shows the products formed at the anode and at the cathode when molten zinc chloride is electrolyzed? | product at anode | product at cathode | | ---------------- | ------------------- | | A | oxygen | zinc | | B | chlorine | hydrogen | | C | chlorine | zinc | | D | oxygen | hydrogen | (ii) Which of the following is the reason why molten zinc chloride is an electrolyte? A it contains molecules that can move B it has a giant structure C it contains delocalised electrons D it contains ions that can move (b) Copper sulfate solution was electrolysed using copper electrodes - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2018 - Paper 1
Question 4
4. (a) Which row shows the products formed at the anode and at the cathode when molten zinc chloride is electrolyzed? | product at anode | product at cathode | | --... show full transcript
Worked Solution & Example Answer:4. (a) Which row shows the products formed at the anode and at the cathode when molten zinc chloride is electrolyzed? | product at anode | product at cathode | | ---------------- | ------------------- | | A | oxygen | zinc | | B | chlorine | hydrogen | | C | chlorine | zinc | | D | oxygen | hydrogen | (ii) Which of the following is the reason why molten zinc chloride is an electrolyte? A it contains molecules that can move B it has a giant structure C it contains delocalised electrons D it contains ions that can move (b) Copper sulfate solution was electrolysed using copper electrodes - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2018 - Paper 1
Step 1
Which row shows the products formed at the anode and at the cathode when molten zinc chloride is electrolyzed?
Answer
The correct row is C, where chlorine is produced at the anode and zinc is produced at the cathode. This is because during the electrolysis of molten zinc chloride, chlorine ions (Cl⁻) are oxidized to form chlorine gas (Cl₂) at the anode, while zinc ions (Zn²⁺) are reduced to form zinc metal at the cathode.
Step 2
Which of the following is the reason why molten zinc chloride is an electrolyte?
Answer
The correct answer is D. Molten zinc chloride is an electrolyte because it contains ions that can move. When zinc chloride is melted, it dissociates into zinc ions (Zn²⁺) and chloride ions (Cl⁻), allowing for conductivity.
Step 3
Draw a labelled diagram to show the apparatus that is used to carry out this electrolysis in the laboratory.
Answer
To conduct the electrolysis of copper sulfate using copper electrodes, you should include a beaker containing copper sulfate solution, two copper electrodes, a battery or power supply connecting the electrodes, and connecting wires. Label the positive electrode (anode), negative electrode (cathode), and the copper sulfate solution.