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Material Type: Notes; Professor: Thomas; Class: General Chemistry II; Subject: Chemistry; University: Auburn University-Montgomery; Term: Unknown 1989;
Typology: Study notes
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Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
oxidation/reduction = redox reactions
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
OXIDATION:OXIDATION: lossOXIDATION:OXIDATION:
loss oflossloss
of electronsofof
electronselectronselectrons
REDUCTION:REDUCTION:REDUCTION:REDUCTION: gain
gain
gain gain of
of
of of electrons
electronselectronselectrons
AlsoAlso changeAlsoAlso
change inchangechange
ininin
oxidationoxidation numberoxidationoxidation
number
number number
2+
2+
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
OxidizingOxidizingOxidizingOxidizing agent:
agent:agent:agent:
oxidizesoxidizesoxidizesoxidizes another
another
another another
species;species;species;species; it
ititit is
isisis itself
itselfitselfitself reduced.
reduced.
reduced. reduced.
ReducingReducingReducingReducing agent:
agent:agent:agent:
reducesreducesreducesreduces another
another
another another
species;species;species;species; it
ititit is
isisis itself
itselfitselfitself oxidized.
oxidized.oxidized.oxidized.
2+
2+
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
2
2
0
2+
2
0
2
2+
2
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
Chemical energy
6666
Electrical energy
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
2+
2
7
2-
3+
3+
acid
Oxidation
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
2+
2
7
2-
3+
3+
acid
Reduction
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
2+
2
7
2-
3+
3+
acid
2
7
2-
3+
2
7
2-
3+
2
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
2+
2
7
2-
3+
3+
to balance hydrogen
acid
2
7
2-
3+
2
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
2+
2
7
2-
3+
3+
acid
14 H
Cr
2
O
7
2-
º º
º º
2 Cr
3+
2
O
Fe
2+
Fe
3+
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
2+
2
7
2-
3+
3+
acid
14 H
Cr
2
O
7
2-
º º
º º
2 Cr
3+
2
O
6 Fe
2+
6 Fe
3+
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
Add OH
both sides, 1 for each H
In basic solutions repeat steps 1-3Combine OH
2
O (eg 19.1)
TypesTypesTypesTypes of
ofofof electrochemical
electrochemicalelectrochemicalelectrochemical cells
cells
cells cells
Oxidation reduction reactionsseparated into two half-reactions.Electrochemical cell: electrodesdip into an electrolyte in which achemical reaction either uses orgenerates an electric current.