What Is a Synthesis Reaction?

A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound.

General Form of a Synthesis Reaction

The general form of a synthesis reaction is:
A + B ? AB

Examples of Synthesis Reactions

These are some examples of synthesis reactions:

• Synthesis of Water
  2 H₂(g) + O₂(g) ? 2 H₂O(g)
   
  

• Synthesis of Carbon Dioxide
  2 CO(g) + O₂(g) ? 2CO₂(g)
   
  
• Synthesis of Ammonia
  3 H₂(g) + N₂(g) ? 2 NH₃(g)
   
  
• Synthesis of Aluminum Oxide
  4 Al(s) + 3 O₂(g) ? 2 Al₂O₃(s)
   
  
• Synthesis of Iron Sulfide
  8 Fe + S₈ ? 8 FeS
   
  
• Synthesis of Potassium Chloride
  2 K(s) + Cl₂(g) ? 2 KCl(s)

?Learn How To Classify Chemical Reactions