section_path: Reaction types/Four basic types/Synthesis
section_name: Synthesis
paragraph_text: Synthesis
  
  In a synthesis reaction, two or more simple substances combine to form a more complex substance. These reactions are in the general form: A + B ⟶ AB {\displaystyle {\ce {A + B->AB}}}
  
  Two or more reactants yielding one product is another way to identify a synthesis reaction. One example of a synthesis reaction is the combination of iron and sulfur to form iron(II) sulfide: 8 Fe + S 8 ⟶ 8 FeS {\displaystyle {\ce {8Fe + S8->8FeS}}}
  
  Another example is simple hydrogen gas combined with simple oxygen gas to produce a more complex substance, such as water.