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69729
C6
Description
GCSE Chemistry Mind Map on C6, created by nikhitaparmar on 04/05/2013.
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chemistry
chemistry
gcse
Mind Map by
nikhitaparmar
, updated more than 1 year ago
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Created by
nikhitaparmar
over 11 years ago
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Resource summary
C6
Redox Reactions
Electrons transferred
Oxidation: loss of electrons
Reduction: gain of electrons
Oxidising agent accepts electrons
Reducing agent donates electrons
Chlorine gas passed into iron(II) salt
Green to yellow
Fe2+ loses electron=Fe3+
Chlorine gained electron that Fe2+ lost
Chlorines reduced. Iron(II) ion must be reducing agent
Displacement Reactions are redox reactions
More reactive metal will displace a less reactive metal from its compound
Put reactive metal into solution of dissolved metal compound, reactive metal replaces less reactive metal
Metal ion gains electrons (reduced)
Metal atom loses electrons (oxidised)
Rusting of iron
iron+oxygen+water=hydrated iron(II) oxide
Iron loses electrons when reacting with oxygen
Oxygen gains electrons when when reacting with iron
Metals combined with other things to prevent rust
Oil, grease and paint prevent rusting
Coat of tin can protect steel from rust
More reactive metals are used to prevent iron rusting
Electrolysis
Splitting up with electricity
electric current passed through a molten or dissolved ionic compound causing it to decompose
creates flow of charge through electrolyte
positive ions towards cathode
negative towards anode
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