- Created by: ethannnnnnnnn
- Created on: 08-11-17 18:55
C6.1 - Intro
- breaks down substance using electricity
- Ionic compounds can only be electrolyised when in molten or water due to their ions being free to move and carry charge to electorodes.
- Panic - Positive anode, Negative is cathode
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C6.2 - changes at the electrodes.
- Ions move to opisiteley charged electorde.
- Cathode - positive ions gain electrons, so are reduced
- Anode - negative ions lose electrons, so are oxidised.
- Less reactive element is produced at Cathode
- At anode:
- oxygen given off from discharged hydroxide ions
- a halogen produced if a soloution of halide
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C6.3 - extraction of alluminium.
- Alumminium oxide - from bauxite, is electrolyised in extraction.
- aluminium oxide mixed with molten cryolite to lower melting point, reducing energy.
- Aluminium forms at cathode
- oxygen forms at anode
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C6.4 - Electrolysis of aqueous soloutions.
- Sodium Chloride soloution (Brine) when electrolysed - Chlorine gas, hydrogen gas given off at electrodes, sodium hydroxide in soloution.
- Hydrogen produced at Cathode as H+ ions are discharged from soloution in prefrence to Na- ions.
- Chlorine produced at anode as Cl- ions are discharged in prefrence to OH- ions.
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C6 - Electrolysis
C6 - Electrolysis.
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