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Definition of chemical combination with examples and laws of chemical combination

Definition of chemical decomposition with examples and types of chemical decomposition

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Chemical Combination:
Two or more substances combined to form a single substance is called chemical combination
A +B -> AB
Example:

  1.     2mg + O2 → 2mgO
  2.     NH3 +  HCl → NH4Cl


Three laws of chemical combination

  • Law of Conservation of Mass
  • Law of Definite Proportions.
  • Law of Multiple Proportions.
  • Gay Lussac's Law of Gaseous Volumes.
  • Avogadro's Law.

Chemical Decomposition:

Single substance splits into two or more substances is called chemical decomposition
AB -> A + B
Example:

  1.     CaCO3 → CaO + CO2
  2.     Pb(NO3)2 → 2PbO +O2 +NO2

Types of Chemical decomposition

  • Thermal decomposition reaction.
  • Electrolytic decomposition reaction.
  • Photo decomposition reaction.



 

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