C6 5.0 / 5 based on 1 rating ? ChemistryElectrolysisGCSEAQA Created by: sophielouise277Created on: 04-10-18 20:09 What does electrolysis mean? Breaking down using electricity 1 of 34 What happens in electrolysis? You use an electric current to break down an ionic compound 2 of 34 What is the compound that is broken down by electrolysis? Electrolyte 3 of 34 How to set up an electrical circuit for electrolysis Two electrodes that dip into the electrolyte with a gap between them 4 of 34 What is the positive electrode called? Anode 5 of 34 What is the negative electrode called? Cathode 6 of 34 Why are the electrodes sometimes made of an unreactive substance? So the electrodes do not react with the electrolyte or products made in electrolysis 7 of 34 What happens during electrolysis? Positive ions move to cathode and negative ions move to anode 8 of 34 What happens when the ions reach the electrodes? Lose charge and become elements 9 of 34 What happens to metals of low reactivity below hydrogen when they are in an aqueous solution? They are deposited from their aqueous solutions 10 of 34 What do negatively charged ions do? Lose electrons 11 of 34 What do positively charged ions do? Gain electrons 12 of 34 In the electrolysis of molten lead bromide where does lead move to? Cathode and gains two electrons 13 of 34 In the electrolysis of molten lead bromide where does bromide move to? Anode and loses two electrons 14 of 34 What is the equation at the cathode? * 15 of 34 What is the equation at the anode? * 16 of 34 What is the equation for water and OH- ions? * 17 of 34 Whatt happens if hydrogen is less reactive than an element? Hydrogen gas is given off at the electrode 18 of 34 When hydroxide ions are discharged what do you see at the anode? Oxygen 19 of 34 What is the order of discharge at the anode? halide ion>hydroxide>all negatively charged ions 20 of 34 What do they mix aluminium with in the electrolysis of it? Cryolite 21 of 34 Why do they mix it with cryolite? To reduce the melting point 22 of 34 What is the equation for the electrolysis? * 23 of 34 What is formed at the cathode? Aluminium 24 of 34 What is formed at the anode? Oxygen 25 of 34 What is the half equation at the cathode? * 26 of 34 What is the half equation at the anode? * 27 of 34 Why are the carbon anodes replaced regularly? Because they gradually burn away as the oxygen reacts with the carbon anodes which form CO2 28 of 34 What is brine? Concentrated sodium chloride solution 29 of 34 What is produced at the anode? Chlorine 30 of 34 What is produced at the cathode? Hydrogen gas 31 of 34 What is also formed? Sodium hydroxide 32 of 34 Equation for electrolysis of brine? * 33 of 34 What is the half equation at the anode? * 34 of 34
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