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4 (a) Which of the following does not conduct electricity? Put a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Question 4
4 (a) Which of the following does not conduct electricity? Put a cross (X) in the box next to your answer. A sodium chloride crystals B sodium chloride solution ... show full transcript
Worked Solution & Example Answer:4 (a) Which of the following does not conduct electricity? Put a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Step 1
Step 2
Describe the use of this apparatus to purify a piece of impure copper.
Answer
The apparatus shown is used for the electrolysis of impure copper. During the process:
- The impure copper is connected to the anode, and as the current passes through the circuit, copper ions from the anode dissolve into the electrolyte solution.
- At the cathode, copper ions in the solution are reduced and deposit on the cathode as pure copper.
- Impurities, which do not dissolve, either stay at the anode or form a sludge at the bottom of the electrolytic cell, thus allowing the extraction of pure copper from the impure sample.