Flashcards
Electrolysis
Flashcards do conjunto (14)
- 1Define electrolysisThe breaking down of a compound using an electric current.
- 2What condition is vital for electrolysis?The electrolyte only works when molten or dissolved in water so can conduct electricity.
- 3What does the current do?It causes a chemical reaction that decomposes the compound.
- 4What are good materials for electrodes?Graphite, steel and carbon
- 5What 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
- 6What is the discharge series for negative ions?SO42−, NO₃−, OH−, Cl−, Br-, I-
- 7When 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.
- 8When electrolysing concentrated hydrochloric acid, what products will be at each electrode?Hydrogen at cathode and chlorine at the anode.
- 9What 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 - 10Describe the electrolysis of brine in a diaphragm cell
- 11What kind of reaction is electrolysis?A redox reaction
- 12At which electrodes does oxidation and reduction occur?Reduction is cathode and oxidation is anode.
- 13What 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
- 14Which electrode does the metal to be electroplated go on?The cathode
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- GCSE Chemistry FlashCards sobre Electrolysis, criado por lisawinkler10 em 10-05-2015.
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