Download - Redox reactio
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Oxidation-ReductionReaction
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GONZAGAHONTILLA
JAROMAY
LAYNO
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Oxidation-ReductionReaction
-Also known as redox reaction
- An electron transfer type of reaction
- In this reaction, an oxidation mustalways be accompanied by areduction process, and all the
electrons released during oxidationmust be accepted during reduction.Hence, this reaction is alwayssimultaneous.
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Oxidation-ReductionReaction
Oxidation reaction refers to thehalf-reaction that inoles loss ofelectron
Reduction reaction is a half-reaction that inoles gain ofelectron
!xample" #$g % O #$gO
#$g #$g % &e'oxidation(
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)he substance that is oxidi*ed is
called the reducin aent and thesubstance that is reduced is calledthe oxidi!in aent.
"ro#erties o$ Oxidi!in and ReducinAents
Oxidi!in Aent Reducin Aent
+ains electrons oses electrons
Oxidation numberdecreases
Oxidation numberincreases
ecomes reduced ecomes oxidi*ed
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%ommon uses o$ t&e terms oxidation and reduction
Oxidation
To combine 'it& ox(en
To )ose &(droen
To )ose e)ectron
To increase in oxidationnumber
Reduction
To )ose ox(en
To combine 'it& &(droen
To ain e)ectrons
To decrease in oxidationnumber
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Oxidation umber
Oxidation number*also called asoxidation state, signi/es the number ofcharges the atom would hae in a
molecule 'or an ionic compound( ifelectrons were transferred completely.
Oxidation numbers enable us to identifyelements that are oxidi*ed and reduced at
a glance.
)he elements that show an increase inoxidation number are oxidi*ed.
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Oxidation umber
0e use the following rules to assign oxidationnumbers"
In free elements, each atom has an oxidationnumber of *ero. )hus, each atom in H , , a, e,1, O and 2 has the same oxidation number" *ero.
3or ions composed of only one atom, the oxidationnumber is e4ual to the charge on the ion.
)he highest oxidation number an element in+roups 5A- 6A can hae is its group number.
)he transition metals ' +roups 5, 7-8( usuallyhae seeral possible oxidation numbers.
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)ypes of Redox Reaction
A combination reaction is areaction in which two or moresubstances combine to form a single
product.
!xample"
9 % O 9O
#Al % 7r #Alr
:ot all combination reactions areredox in nature. )he same holds fordecom osition reaction.
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# 7
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)ypes of Redox Reaction
+ecom#osition reaction is thebreakdown of a compound into two ormore components.
!xample" #HgO #Hg % O
%ombustion reaction is a reaction in
which a substance reacts with oxygen,usually with the release of heat andlight to produce a