Question

nitrogen gas + hydrogen gas forms ammonia gas. type of reaction = ______. single displacement double displacement decomposition synthesis

Explanation:

A synthesis reaction is defined as a reaction where two or more reactants combine to form a single product. The given reaction has nitrogen gas ($N_2$) and hydrogen gas ($H_2$) as reactants, which combine to make ammonia gas ($NH_3$), following the pattern $A + B
ightarrow AB$. Single displacement, double displacement, and decomposition reactions do not match this reactant-to-product structure.

Answer:

Synthesis