GCSE Chemistry Flashcards on Electrolysis, created by lisawinkler10 on 10/05/2015.
Flashcards by lisawinkler10, updated more than 1 year ago
Created by lisawinkler10 over 8 years ago

Resource summary

Question Answer
Define electrolysis The breaking down of a compound using an electric current.
What condition is vital for electrolysis? The electrolyte only works when molten or dissolved in water so can conduct electricity.
What does the current do? It causes a chemical reaction that decomposes the compound.
What are good materials for electrodes? Graphite, steel and carbon
What are the products at each electrode? When decomposing, a metal or hydrogen is formed at the cathode and a non-metal formed at the anode
What is the discharge series for negative ions? SO42−, NO₃−, OH−, Cl−, Br-, I-
When electrolysing concentrated aqueous sodium chloride. What products will be at each electrode? Hydrogen gas at cathode and Chlorine gas at anode because hydrogen is higher in the discharge series that sodium.
When electrolysing concentrated hydrochloric acid, what products will be at each electrode? Hydrogen at cathode and chlorine at the anode.
What is chlorine, hydrogen and sodium hydroxide used for? Chlorine: solvents, bleaches and treating drinking water Hydrogen: making ammonia, margarine, and as a fuel Sodium hydroxide: soap and the extraction of aluminium
Describe the electrolysis of brine in a diaphragm cell
What kind of reaction is electrolysis? A redox reaction
At which electrodes does oxidation and reduction occur? Reduction is cathode and oxidation is anode.
What happens at each electrode when electrolysing lead bromide? At the cathode, Lead is reduced and gains 2 electrons whereas Bromine is oxidised and loses 2 electrons
Which electrode does the metal to be electroplated go on? The cathode
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