A simple example of a synthesis reaction is the Combustion of Hydrogen, that obtains Water as a product:
[tex]2 \ H(g) + O(g) \rightarrow H_2O(g)[/tex].
Another example, its the synthesis of Carbon dioxide:
[tex]2 \ CO(g) + O_2 \rightarrow 2 \ CO_2(g)[/tex]
