Electrolysis of Aluminium oxide 0.0 / 5 ? ChemistryElectrolysisGCSEAQA Created by: tonisha_Created on: 05-11-21 19:59 What is the chemical formula for aluminium oxide? AlO 2 3 1 of 30 What is the melting point of aluminium oxide? around 2000 degrees celsius 2 of 30 What is the positive ion? 3+ Al 3 of 30 What is the negative ion? 2- O 4 of 30 Firstly, what are you going to mix the aluminium oxide with? cryolite 5 of 30 Why? this will lower the boiling point 6 of 30 This will ultimately reduce what and save what? reduce energy needed save money 7 of 30 What are the cathode and anode made of? graphite 8 of 30 Graphite is what? carbon 9 of 30 Why is it made out of graphite? it is a good conductor of electricity 10 of 30 Why? it has a delocalised electron 11 of 30 It also has a very high what? melting point 12 of 30 3+ Which electrode do the Al ions go? to the cathode 13 of 30 What reaction is this? reduction 14 of 30 What reaction always takes place at the cathode? reduction 15 of 30 3+ What is the equation for Al ion to become an aluminium atom? 3+ - Al + 3e------------->Al 16 of 30 This is because Al has lost how many electrons? 3 17 of 30 To have an overall what charge? positive 18 of 30 So it need how many more electrons? 3 19 of 30 To become an aluminium what? atom 20 of 30 2- The O ions go to which electrode? the anode 21 of 30 Which reaction takes place here? oxidation 22 of 30 What is oxidation? the loss of electrons 23 of 30 What two formulas may this be shown in? 2- - O----->O+2e 2- - O - 2e------->O 24 of 30 What needs to happen to the anode regularly? it needs to be replaced 25 of 30 Why? The oxygen produced at anode what? reacts with the graphite 26 of 30 What does it form? carbon dioxide gas 27 of 30 What are three disadvantages of Electrolysis? it is expensive melting compound requires a lot of energy electric currents produced also need a lot of energy 28 of 30 In half equations, the positive ion will always have something _____ to it. added e.g. Al+3e- 29 of 30 The negative ion will look like what? O2- --------> O+2e 30 of 30
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