Question

define chemical reaction its various type with example

Answer 1

there are 4 types of chemical reactions,they are:-
A]Synthesis / Direct Combustion

These chemical reactions occur where two or more substances react together to form just one product. Synthesis reactions are usually exothermic, though they might sometimes require an addition of heat energy to start off.  
Examples: In the presence of heat iron (II) and sulfur is such an example.

Fe + S →→ FeS B] Decomposition reaction
Decomposition reactions have just one reactant which breaks up to from two or more simpler products. Usually, decomposition reactions are endothermic as they require an input of heat and so such decomposition reactions are known as thermal decomposition reactions.
Examples: 

The heating of mercury (II) oxide yield oxygen and mercury 

2HgO →→ 2Hg + O2
C]Single Displacement
Such types of chemical reactions occur when a more reactive element displaces a less reactive one from a solution its compounds.   
Examples:
 
Zinc is a more reactive element/ metal than copper. So, Copper is displaced from copper (II) sulfate solution.  
Zn + CuSO4 →→ ZnSO4 + Cu 
D]Double Displacement 
Double displacement chemical reactions involve the exchange of ions between two salts in aqueous solutions. Neutralization and precipitation reactions are types of double displacement reactions. 
In neutralization reactions, the reaction occurs between a base and an acid. The acidity (of the acid) is destroyed thus ‘neutralizing’ its effect and producing a salt and water.
Example: 
  
H2SO4 + CuO →→ CuSO4 + H2O 
   

CHEMICAL REACTION IS:-




a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.  

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Answer 2

chemical reaction there is which change in electron between different elements . the product formed after chemical reaction have different property
example hydrogen burn oxygen support but water controls fire
there are 4 type of chemical reaction
combination recation
decomposition recation
displacement recation
double displacement recation
redox recation