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SingaporeChemistryQuick questions
Electrolysis
Quick questions on Electroplating and applications explained: O-Level Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is reactive electrodes take part?Show answer
In the earlier dot points the electrodes were inert. In electroplating and copper purification the electrodes are reactive: the anode is made of the plating or pure-source metal and dissolves during electrolysis, while the cathode is the object to be coated (or pure metal to be grown). The metal effectively transfers from the anode, through the solution as ions, to the cathode.
What is electroplating?Show answer
Electroplating coats an object with a thin layer of metal (for example silver, chromium or nickel) to make it more attractive or to protect it from corrosion. The setup:
What is purification of copper?Show answer
Copper for electrical wiring must be very pure. Electrolysis refines it:
What is industrial uses of electrolysis?Show answer
Electrolysis is widely used in industry:
What is q1?Show answer
State which electrode an object should be when it is electroplated. [1 mark]
What is q2?Show answer
In the purification of copper, write the half-equation for the reaction at the impure copper anode. [1 mark]
What is q3?Show answer
Explain what happens to the impurities when copper is purified by electrolysis. [2 marks]
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