Electrolysis C3 0.0 / 5 ? ChemistryElectrolysisGCSEEdexcel Created by: elliekhannaCreated on: 21-06-16 11:56 What is electrolysis Using electricity to decompose a compound 1 of 15 What is the difference between electrolysis of molten and solution In molten electrolysis you get the two elements from the compound but in solution it depends on the reactivity 2 of 15 What goes to the cathode Cations because it is negatively charged 3 of 15 What goes to the anode Anions because it is positively charged 4 of 15 What happens at the cathode The ions are reduced so the gain electrons to become atoms again 5 of 15 What happens at the anode The ions are oxidised so they loose electrons the covalentley bond to form molecules 6 of 15 What is at each electrode in the electrolysis of impure copper At the cathode is pure copper and the anode is impure 7 of 15 What appears under the anode A pile of sludge made from the impurities of the impure copper 8 of 15 What can you see happening to the electrodes The cathode will be getting bigger and the anode smaller 9 of 15 Why because the copper ions from the impure will be attracted the the cathode where they are reduced to form copper atoms again 10 of 15 What solution is the electrolyte Copper sulphate 11 of 15 What is electroplating Using electrolysis to cover an object with a thin layer of metal 12 of 15 What is at the cathode The object you want to plate 13 of 15 What is at the anode The metal you want to use to cover the object 14 of 15 Why do we use electroplating To stop corrosion of some metals and for decoration 15 of 15
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