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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 C m... 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
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Step 2
Describe the use of this apparatus to purify a piece of impure copper.
Answer
The apparatus is set up for the process of electrolysis, where impure copper is placed at the anode and pure copper serves as the cathode. When an electric current passes through the electrolyte, copper ions from the anode dissolve into the solution. These ions then migrate towards the cathode, where they are reduced and deposit as pure copper. The impurities in the impure copper either remain in the solution or fall to the bottom as anode mud, allowing for the extraction of purified copper.