What type of reaction is represented by the equation H₂ + N₂ → NH₃? A) synthesis B) single replacement C) double replacement D) combustion E) decomposition

What pattern are we looking for?

Reaction types are often identified by their overall form. Here, we check whether reactants combine, swap partners, break apart, or react with oxygen.

Match the equation to a reaction template

The equation shows hydrogen and nitrogen forming one product:

$$H_2 + N_2 \rightarrow NH_3$$

That matches the synthesis template:

$$A + B \rightarrow AB$$

Why the other options do not fit

• Single replacement looks like $A + BC \rightarrow AC + B$, but there is no compound $BC$ to start with.
• Double replacement looks like $AB + CD \rightarrow AD + CB$, but there are not two ionic compounds reacting.
• Combustion typically involves $O_2$ as a reactant making $CO_2$ and $H_2O$ (for hydrocarbons), and $O_2$ is not present.
• Decomposition looks like $AB \rightarrow A + B$, the opposite direction of what is happening here.