OxidationReduction and redox equations
oxidation oxidisingagents are reduced so gain e
e are transferred
f
Eduction when reduction and
reducing agents are oxidised so lose e oxidation occurs
Esain
of e
oxidation numbers or state
rules
Elements ox state in compounds example
1 Elements 70 L2 Fe Oz
2 Ions same as ionic charge l e 1 alt 2
3 Group I I 7KCL
IGYMIhiim.FI 3 ebQnnyarides
6 Hydrogen where it is 1 Htt
7 Chlorine
7154 Pt if in a compound with Fand0 would b ite Kelleris t
in
8 FYI M 2metals
except 1 inperoxidesand 2inOF lizoco is 1 in 4202
s
10 Transition varies Fez033 Fe0 2
Oxidation or reduction
oxidation is an increase in oxidation number and reduction is a decrease
writing half equations
Rules
1 write speciesbefore and after a reaction ninja
Mnet
2 Balance any atoms apart from oxygenandHydrogenMnog Mnet
3 Balance anyoxygens with H2O Mnog Mn2 4420
4 Balance any hydrogens with Htions Mno 4 8Ht Mn2 442
5 Balance charges with e Mn 09 8HttSe MnetAH
combining half equations
forms an ionic equation showsbothreduction andoxidation a redoxreaction
rules
1 ensure bothequationscontain same numberofelectrons
2 cancel electrons and combine the 2equations
ionic equation should have no electrons
oxidation oxidisingagents are reduced so gain e
e are transferred
f
Eduction when reduction and
reducing agents are oxidised so lose e oxidation occurs
Esain
of e
oxidation numbers or state
rules
Elements ox state in compounds example
1 Elements 70 L2 Fe Oz
2 Ions same as ionic charge l e 1 alt 2
3 Group I I 7KCL
IGYMIhiim.FI 3 ebQnnyarides
6 Hydrogen where it is 1 Htt
7 Chlorine
7154 Pt if in a compound with Fand0 would b ite Kelleris t
in
8 FYI M 2metals
except 1 inperoxidesand 2inOF lizoco is 1 in 4202
s
10 Transition varies Fez033 Fe0 2
Oxidation or reduction
oxidation is an increase in oxidation number and reduction is a decrease
writing half equations
Rules
1 write speciesbefore and after a reaction ninja
Mnet
2 Balance any atoms apart from oxygenandHydrogenMnog Mnet
3 Balance anyoxygens with H2O Mnog Mn2 4420
4 Balance any hydrogens with Htions Mno 4 8Ht Mn2 442
5 Balance charges with e Mn 09 8HttSe MnetAH
combining half equations
forms an ionic equation showsbothreduction andoxidation a redoxreaction
rules
1 ensure bothequationscontain same numberofelectrons
2 cancel electrons and combine the 2equations
ionic equation should have no electrons
