Chemical reaction and its type

Chemical reaction and its type 

    What is Chemical Reactions?

Ø     Chemical Reaction:-The process in which involve a chemical change  is called a chemical reaction.Rearrangement of atoms takes place in a chemical reaction.

          During chemical reaction energy either released or absorbed.

·       Reactants:- The substance which take part in a chemical reaction.

·       Product:- The new substances formed as a result of chemical        reaction.

                     

chemical reaction

Ø Type of chemical Reaction:-

·       Combination reaction :- The reaction in which two or more substances combine to form a new single substance.

Example:- C + O₂ → CO_2.

·       Decomposition reaction:- The reaction in which a single compound decompose into two or more smaller compound.

Example:-

         CaCO₃       →       CaO +CO₂

    In above example upward arrow represent heat is evolved in this reaction.

The Decomposition reaction is the inverse of Combination reaction.

·       Displacement reaction:- The reaction in which the atom of one element displace the atom of another element from compound and form a new compound.

Generally a more active element displace the another element which is less active .

Example:-

                 Fe + CuSO₄   →        FeSO₄ +Cu

In this example Fe is more active than Cu .

·       Double Displacement Reaction:- The reaction in which two compounds react and an exchange of ions take place and form  new compounds.

Example :-

             BaCl₂ + Na₂SO₄   →         BaSO₄  + 2NaCl

Ø Precipitation reaction:- Any reaction in which precipitate (insoluble solid ) is formed is called precipitation reaction.

Double displacement reaction are also precipitation reactions.

Ø Exothermic reaction :-

                                       The  chemical reaction in which heat is released or evolved.

Example :- 2Mg + O₂  →      2MgO + Heat released


        

Type of chemical reaction

Ø Endothermic reaction :-

                                         The  chemical reaction in which heat is absorbed.

Example:-   N₂ + O₂   →      2NO – Heat Absorbed.


       

Type of chemical reaction

Ø Reversible Reaction:-

                                The chemical reaction which proceeds in both direction (Forward as well as Backward direction) is called Reversible reaction.

Example :   CaCO₃  ⇋     CaO  + CO₂

Ø Irreversible reaction :-

The chemical reaction in which reaction proceeds in only one direction is called irreversible reaction.

               Example:     Zn + H₂SO₄      →     ZnSO₄ + H₂

    

Ø Neutralisation reaction :-

The reaction in which acid and base react and form salt and water .

                   Example:   KOH + HCl     →       KCl + H₂O

Ø Photo Chemical Reaction:-

                          The chemical reaction which occurs in the presence of sunlight is called Photo Chemical Reaction.

Example:   6CO₂ + 12H₂O      →       C₆H₁₂O₆  + 6H₂O +6O_2.

             This reaction is also called Photosynthesis.

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