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Synthesis Reaction Definition

Overview of a Synthesis or Direct Combination Reaction

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In one synthesis reaction, chlorine and potassium react to form potassium chloride.

In one synthesis reaction, chlorine and potassium react to form potassium chloride.

Greenhorn1, public domain
A synthesis reaction or direct combination reaction is one of the most common types of chemical reactions. In a synthesis reaction two or more chemical species combine to form a more complex product.

A + B → AB

The combination of iron and sulfur to form iron (II) sulfide is an example of a synthesis reaction:

8 Fe + S8 → 8 FeS

Another example of a synthesis reaction is the formation of potassium chloride from potassium and chlorine gas:

2K(s) + Cl2(g) → 2KCl(s)

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