redox reactio

7/26/2019 Redox reactio

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Oxidation-ReductionReaction

members:GALEAGOMEZ

GONZAGAHONTILLA

JAROMAY

LAYNO


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-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 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.

# #

# 7

;; -#

%&

; ; -7 -5


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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

redox reactio

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