C6.1 - Introduction to Electrolysis For the new 9-1 AQA specification 3.0 / 5 based on 2 ratings ? ChemistryElectrolysisGCSEAQA Created by: aleena.jamesCreated on: 28-11-16 19:04 What is electrolysis? Breaking down substances using electricity 1 of 16 What type of compound can be electrolysed? Ionic 2 of 16 What is an electrolyte? The substance that is being broken down by electrolysis 3 of 16 What is the positive electrode called? What is the negative electrode called? Anode and cathode 4 of 16 Why are the electrodes made up of nonreactive substances? So that the electrodes don't react with the electrolytes or products made in electrolysis. 5 of 16 During electrolysis, the positively charged ions (______) move to the _______. It is usually a ______. Cation, cathode, metal 6 of 16 During electrolysis, the negatively charged ions (_____) move to the _____. It is usually a ___. anion, anode, gas 7 of 16 What happens when the ions reach the electrode? They lose charge and become elements. 8 of 16 What happens at the electrodes? A gas is given off and a metal is deposited. 9 of 16 Name a property of ionic compounds and explain it. They don't conduct electricity when they are solid because the ions are in a fixed place in the lattice. 10 of 16 Once the ionic compound is melted the ........... Ions are free to move and carry the charge to the electrodes. 11 of 16 Ionic substances have a _________ so _______ high melting point so they take a lot of energy to melt and free ions to move to the electrodes 12 of 16 Some ionic substances .......... Dissolve in water so the ions are free to move 13 of 16 Why is it difficult to predict the products when electrolysing ionic compounds in solutions? Water forms ions so the products at the electrodes aren't what you expect. 14 of 16 What metals are deposited? Metals below hydrogen on the reactivity series. 15 of 16 Can covalent compounds be electrolysed? They can't be electrolysed unless the react in water to form ions. 16 of 16
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