electrochemistry part-1-definition electrochemistry-general information-metathetical reaction-redox reaction-classical cncept-electronic concept-physical observation of electrochemical cell.-by study everything .

 

ELECTROCHEMISTRY [PART-1]

contents :-

 

electrochemistry definition-

general information-

metathetical reaction-

redox reaction –

classical concept of redox reaction –

electronic concept of redox reaction –

physical observation of electrochemical cell –

 

here the topic is electrochemistry but firstly we have to know about basics of the particular topic . so firstly we discus about type of reactions and redox reaction.  Because of there is a lots of concepts of electrochemistry based on redox reaction.

Definition :  “electrochemistry is the study of production of electricity “

The electricity is released during spontaneous chemical reaction.

The produced electrical energy is used for bring about non-spontaneous chemical transformations.

The widely uses of electrochemical methods into the production of many metals like sodium hydroxide , fluorine , chlorine etc.

We can see in our regular activity we use the batteries and fuel cells this is what ?

This is because of conversion of chemical energy into electric energy . the cells and batteries are used as large scale in various devices and tools .

Eg. Mobile phone , tv remotes , earphones , digital camera , laptops , trimmer  etc.

As we know we all connected with that type of things so we can easily understand .

 

Types of chemical reactions :

 

What is chemical reactions :

Chemical reaction is The reaction in which two or more reactant or substances are react with each other and gives product called chemical reaction.

Or in other words

The scientific study of reaction in which two or more reactant or substances react with each other and gives product .

 

Here we discus about two type of chemical reactions , first one is the metathetical reaction and second is redox reaction.

 

Metathetical reaction :

That type of reaction in which no changes occur in oxidation number but become changes in partner, called metathetical reaction.

for easily understand look at the given chemical reaction in which there I given the oxidation number in below the reactants and particular molecule.

There is a no change occur in oxidation number but as we can see the changes in partner .

 

Detail explanation on changing or no-changing oxidation number in given chemical reaction and changing in partner.

For example , in reactant NaCl  the oxidation number number of Na is (+1) and oxidation number of Na  in product NaNO₃  is also (+1) .

other way in reactant NaCl the oxidation number of Cl  is (-1) and oxidation number of Cl in product(AgCl) is a also (-1) .

same case apply to the other reactant AgNO₃

in the reactant AgNO₃ the oxidation number of Ag is (+1) and also the oxidation number of Ag in product (AgCl) is (+1) .

other way the oxidation number of NO₃ in reactant is (-1) and also in product (NaNO₃) the oxidation number of NO₃ is (-1) .

detail explanation of changing in partner (during chemical reaction process) :

Look at the reaction in the reactant NaCl , partner of Na is Cl but there is a change occur in product the partner of Na is changed there was a replaced by NaNO₃ on the place of Cl .

Other way in the reactant AgNO₃ partner of Ag is NO₃ but in product there will be replaced by the cl on the place of NO₃ .

 

Redox reaction :

 

Classical concept of redox reaction :

Oxidation :

That type of reaction in which during process adding of oxygen(o) and removal of hydrogen[H] is called oxidation.

Reduction :

That type of reaction in which during process adding of hydrogen[H] and removal of oxygen(o) is called reduction.

 

Electronic concept or transfer of electron ( redox reaction ) :

Oxidation :

1) The reaction in which removal of electrons or electron released is called oxidation .

Eg.

In above reaction we can see the removal of electron.

Or in other words

2) that type of reaction in which oxidation number of an element is increases also called oxidation.

Eg.

In above reaction we can see the increases in oxidation number . the oxidation number of Na is increases from 0 to +1 .

 

Reduction :

1 ) The reaction in which electrons are gained is called reduction.

Eg.

In above reaction we can see the electron has gained .

 

Or in other words

2 ) that type of reaction in which the oxidation number of an element is decreases is called reduction.

In above reaction we can see the gained electrons it indicates the reduction is occur. The oxidation number of Zn is decreases from +2 to 0.

physical observation of electrochemical cell :

requirement : zn metal strip , two beakers ,aqueous solution of CuSO₄ .

 

fill the two beakers with the aqueous solution of CuSO₄ .

then put the Zn strip into beaker like shown in figure .

after some time we can see the some changes is given below ,

-The intensity of the color of the CuSO₄ solution decreases.

-the solution is become hot or solution is heated .

-corrosion of zn strip

-cu metal is found at the bottom of beaker.

 

 

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