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CHEMICAL REACTIONS

CHEMICAL REACTIONS 


         Chemical Reaction: The things which occurs new substances 
                                      form with new products.

                      There are four types of chemical Reactions:

                                  1)Combination Reaction
                                  2)Decomposition Reaction
                                  3)Displacement Reactions
                                  4)Double Displacement Reaction

         1) Combination Reaction: In a Chemical Reaction the single product form two are more reactants.  Ex: CaO + H2O →  Ca(OH)2  +  Heat
                                 C      +   O2  →  CO2



      2)Decomposition Reaction      : In a compound splits two are more reactants 
                                                                            Ex: FeSO4 → Fe2 O3 + SO2 + So3
                                                                                   CaCO3 →Cao + CO2


                     There are three decomposition are there:    
                                             i) Thermal decomposition reaction
                                             ii) Electric decomposition reaction
                                            iii)Light energy decomposition reaction

               i) Thermal decomposition reaction: When a chemical reaction carried out 
                                                                                                      by heating.
                                                                                   Ex: CaCO3 → CaO + CO2


                 ii)Electric decomposition reaction: When a chemical reaction carried out 
                                                                                                      by electricity.
                                                                                             Ex: Pb(NO3) → PbO + NO2  + O2


                iii) Light energy decomposition reaction: When a chemical reaction                                                                                                                       carried out Sun Light.
                                                                                                     Ex: AgCl  → Ag + Cl2

              3)Displacement Reactions :    When a element displaces another element from                                                                                      its compound.
                                                                                      Ex:Fe + CuSO4   →FeSO4 + Cu
                                                                                            Zn + CuSO4 → Zn SO4 + Cu
             
          4)Double Displacement Reaction: Two different atoms or groups of ions                                                                                                     are exchanged.

                                                                                             Ex: Na2SO4 + BaCl2  →  BaSO4 + NaCl
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