Give an example of combination reaction between two elements.

Hydrogen and oxygen in elemental form combine to form water.

Combination reaction

It is defined as a chemical reaction in which two or more substances combine to form a single substance under suitable conditions. Combination reactions involve the formation of new bonds and this process releases a large amount of energy in the form of heat.


  • Formation of calcium oxide by the combination elements calcium and oxygen.
    2Ca + O2 → 2CaO
  • Formation of ammonia by the combination of elements nitrogen and hydrogen.
    N2 + 3H2 → 2NH3

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