Redox reactions
Redox reactions Redox reactions
Redox reactions
&
& &
&
electrochemistry
electrochemistryelectrochemistry
electrochemistry
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Redox Reactions and Electrochemistry - Lecture Notes | CHEM 1200, Study notes of Chemistry
Material Type: Notes; Professor: Thomas; Class: General Chemistry II; Subject: Chemistry; University: Auburn University-Montgomery; Term: Unknown 1989;
Typology: Study notes
Pre 2010
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Redox reactions
Redox reactions
Redox reactions
Redox reactions
electrochemistry
electrochemistry
electrochemistry
electrochemistry
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
Electrical
energy
Chemical
energy
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
Zn
+ Cu
2+
Zn
2+
Cu
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.
Zn
+ Cu
2+
Zn
2+
Cu
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
Mg
+ 2 HCl
MgCl
2
+ H
2
Mg
0
+ 2H
Cl
Mg
2+
Cl
2
+ H
0
2
Mg oxidized to Mg
2+
H
reduced to H
2
Electrochemistry Electrochemistry
Electrochemistry Electrochemistry
Chemical energy
6666
Electrical energy
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
Fe
2+
+ Cr
2
O
7
2-
Fe
3+
+ Cr
3+
- Write unbalanced ionic equation
acid
- Separate into half-reactions
Oxidation
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
Fe
2+
Cr
2
O
7
2-
Fe
3+
Cr
3+
- Write unbalanced ionic equation
acid
- Separate into half-reactions
Reduction
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
Fe
2+
+ Cr
2
O
7
2-
Fe
3+
+ Cr
3+
- Add water to balance oxygen
acid
Cr
2
O
7
2-
2 Cr
3+
Cr
2
O
7
2-
2 Cr
3+
H
2
O
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
Fe
2+
+ Cr
2
O
7
2-
Fe
3+
+ Cr
3+
- Add H
to balance hydrogen
acid
Cr
2
O
7
2-
2 Cr
3+
+ 7H
2
O
14 H
- Check charges
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
Fe
2+
+ Cr
2
O
7
2-
Fe
3+
+ Cr
3+
- Compare half reactions
acid
14 H
Cr
2
O
7
2-
- 6e
º º
º º
2 Cr
3+
- 7H
2
O
Fe
2+
Fe
3+
- e
- Compare half reactions
BalancingBalancingBalancingBalancing redox
redox
redox redox equations
equationsequationsequations
Fe
2+
+ Cr
2
O
7
2-
Fe
3+
+ Cr
3+
- Compare half reactions
acid
14 H
Cr
2
O
7
2-
- 6e
º º
º º
2 Cr
3+
- 7H
2
O
6 Fe
2+
6 Fe
3+
+ 6e
- Compare half reactions
BalancingBalancingBalancingBalancing redox
redoxredoxredox equations
equationsequationsequations
Add OH
both sides, 1 for each H
In basic solutions repeat steps 1-3Combine OH
& H
H
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.