Chemistry C2 5.4 Electrolysis 0.0 / 5 ? ChemistryElectrolysisGCSEAQA Created by: Atlanta and JacobCreated on: 26-02-17 13:53 What does electrolysis do? Electrolysis splits up a substance using electricity. It is the process that uses electricity to break down ionic compounds into elements. 1 of 14 When can ionic compounds be electrolysed and how? Ionic compounds can only be electrolysed when they are molten or in solution because then their ions are free to move to the electrodes. 2 of 14 What happens to ions in electrolysis? Positive ions move to the negative electrode and negative ions move to the positive electrode. 3 of 14 When does electrolysis take place? When electricity is passed through a molten ionic compound or a solution containing ions. 4 of 14 What is the substance that is broken down by electrolysis called? The electrolyte. 5 of 14 What does the electrical circuit have? Two electrodes that make contact with the electrolyte. 6 of 14 What are the electrodes often made of? An inert substance that does not react with the products. 7 of 14 During electrolysis, what happens to the ions in the electrolyte? They move to the electrodes where they are discharged to produce elements. 8 of 14 What happens to the positively charged ions during electrolysis? They are attracted to the negative electrode where they form metals or hydrogen, depending on the ions in the electrolyte. 9 of 14 What happens to the negatively charged ions during electrolysis? They are attracted to the positive electrode where they lose their charge to form non-metallic elements. 10 of 14 What happens when molten lead bromide is electrolysed? Lead is produced at the negative electrode, at the same time bromine is produced at the positive electrode. 11 of 14 What must be done to ionic compounds before they can be electrolysed? They must be melted or dissolved in water. 12 of 14 What are the substances produced when molten zinc chloride is electrolysed? Chlorine at the positive electrode and zinc at the negative electrode. 13 of 14 **LOOK UP DIAGRAM OF IONS MOVING WITHIN ELECTROLYSIS** ** 14 of 14
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