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C2: Electrolysis
Karten in diesem Stapel (9)
- 1Name the three advantages of recycling copper, by electrolysis.- low melting point, so it is cheap to melt.
-reduces the need for mining.
-keeps the cost of copper down. - 2Name the three disadvantages of recycling copper, by electrolysis.-less copper is mined so there are less jobs.
-the process can cause pollution.
-the small amounts used in electoral equipment are difficult to separate. - 3In electrolysis what is the solution used?The solution is electrolyte of copper sulphate solution.
- 4What does the mnemonic OILRIG stand for?Oxidation Is Loss, Reduction Is Gain.
- 5Does impure copper dissolve at the cathode or anode?It dissolves at the anode.
- 6What is the cathode made from?It is made from a pure sheet of copper.
- 7Why does the concentration of copper sulphate solution stay the same?The solution stays the same because the impure copper dissolves and is plated onto the cathode at the same rate.
- 8What is the equation for oxidation? and also describe what happens to the electrons.At the anode the copper atoms lose electrons to form Cu+ ions.
Cu - 2e- --> Cu2+ - 9What is the equation for reduction and describe what happens to the electrons?Copper is plated on to the cathode when Cu2+ ions gain electrons.
Cu2++ 2e- --> Cu
Informationen
- Beschreibung
- All information is sourced from the Collins revision textbook, GCSE OCR Gateway B Higher.
- Erstellt von
- Ella Maggs · Apr 2016
- Aktualisiert
- 21 Nov 2016
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- 49
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