2697073
Description
Flashcards by lisawinkler10, updated more than 1 year ago
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Created by lisawinkler10
almost 9 years ago
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| 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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