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Contents Electrolysis of molten compounds Electrolysis of solutions Electroplating Extraction of metals Electric cells Electrolysis of molten compounds.

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Presentation on theme: "Contents Electrolysis of molten compounds Electrolysis of solutions Electroplating Extraction of metals Electric cells Electrolysis of molten compounds."— Presentation transcript:

1 contents Electrolysis of molten compounds Electrolysis of solutions Electroplating Extraction of metals Electric cells Electrolysis of molten compounds Electrolysis of solutions Electroplating Extraction of metals Electric cells

2 electrolysis of molten compounds an electrolyte is an ionic compound that conducts electricity; molten state or solution in water molten ionic compounds and solutions of ionic compounds can conduct electricity due to presence of mobile ions that can carry current electrolysis is the conduction of electricity by an electrolyte, leading to its decomposition example: electrolysis of molten sodium chloride inert electrodes (e.g. carbon electrodes) do not react in electrolysis an electrolyte is an ionic compound that conducts electricity; molten state or solution in water molten ionic compounds and solutions of ionic compounds can conduct electricity due to presence of mobile ions that can carry current electrolysis is the conduction of electricity by an electrolyte, leading to its decomposition example: electrolysis of molten sodium chloride inert electrodes (e.g. carbon electrodes) do not react in electrolysis

3 electrolysis of molten compounds electrolysis of molten sodium chloride battery ammeter to show current flowing porcelain crucible pipeclay triangle tripod HEAT STRONGLY molten sodium chloride - + carbon anode; attracts anions; oxidation carbon cathode; attracts cations; reduction

4 electrolysis of molten compounds at the anode, C l - ions give away electrons to become C l 2 ; C l - ions are discharged Na + (l) + e Na (l) molten sodium chloride contains Na + and C l - ions at the cathode, Na + ions take in electrons to become Na atoms; Na + ions are discharged 2C l - (l) C l 2 (g) + 2e - overall reaction 2NaC l (l) 2Na (l) + C l 2 (g) electrolysis of molten sodium chloride

5 electrolysis of molten compounds electrolysis of molten sodium chloride molecules of chlorine gas produced chloride ion gives electron to anode chlorine atom electrons flow from anode into battery anode cathode sodium ion takes electron from cathode sodium atom sodium metal produced electrons flow from battery into cathode sodium ion attracted to cathode chloride ion attracted to anode

6 electrolysis of molten compounds electrolysis of other molten compounds when a molten ionic compound is electrolysed, metal is produced at the cathode; non-metal is produced at the anode Molten Electrolyte Product at Cathode Product at Anode calcium chloride, CaC l 2 calcium, Cachlorine, C l 2 sodium iodide, NaIsodium, Naiodine, I 2 lead(II) oxide, PbOlead, Pboxygen, O 2


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