Chemical Reactions & Chemical Equations
  
 
 
TYPES OF CHEMICAL REACTIONS
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   There are six types of chemical reactions:
  1. ADDITION REACTION (SYNTHESIS).
  2. DECOMPOSITION.
  3. DISPLACEMENT.
  4. DOUBLE DISPLACEMENT.
  5. NEUTRALIZATION.
  6. HYDROLYSIS
ADDITION REACTIONS OR SYNTHESIS
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   Chemical reactions in which two or more substances react to produce one compound are known as    addition reaction.
   They can be represented as:
A + B è AB
   EXAMPLE:
H2 + Cl2 è 2HCl
SO2 + Cl2 è SO2Cl2
DECOMPOSITION
  
   A chemical reaction in which a compound splits into two or more fragment is called decomposition.
   They can be represented as:
AB è A+B
   EXAMPLE:

2KClO3 + HEAT è 2KCl + 3O2

CH4 + HEAT è C + 2H2
   Usually for decomposition heat is required.
DISPLACEMENT REACTION
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   A chemical reaction in which a radical or group replaces another radical or group form a compound and    takes its position is called a displacement reaction.
   They can be represented as:
A + BC è AC + B
   EXAMPLE:
Zn + H2SO4 è ZnSO4 + H2
Zn + CuSO4 è ZnSO4 + Cu
DOUBLE DISPLACEMENT
  
   A chemical reaction in which two substances are decomposed to form new substances by exchanging their    radicals is called double displacement reaction.
   They can be represented as:
AB+CD è AD+CB
   EXAMPLE:
BaCl2 + Na2SO4 è BaSO4 + 2NaCl
AgNO3+ NaCl è AgCl + NaNO3
NEUTRALIZATION
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   A chemical reaction in which an acid and a base react to form salt and water is called Neutralization.
Acid + Base è Salt + Water
EXAMPLE:
HCl + NaOH è NaCl + H2O
HNO3 + NaOH è NaNO3 + H2O
HYDROLYSIS
  
The type of double displacement reaction in which one reactant is water is called "Hydrolysis".
OR
Reaction of a substance with water in which PH of water is changed is referred to as "Hydrolysis".
   EXAMPLE:
FeCl3 + 3H2O è Fe (OH)3 + 3HCl
Na2CO3+2H2O è 2NaOH+ H2CO3
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