Question

2h₂ + o₂ → 2h₂o
synthesis
decomposition
single displacement
double displacement
combustion

Explanation:

A synthesis reaction combines two or more reactants to form a single product. In the given equation \(2H_2 + O_2 \to 2H_2O\), hydrogen (\(H_2\)) and oxygen (\(O_2\)) (two reactants) combine to form water (\(H_2O\)) (one product), which fits the definition of a synthesis reaction.
A decomposition reaction would have one reactant breaking into multiple products. A single - displacement reaction has one element displacing another in a compound (e.g., \(A + BC\to AC + B\)). A double - displacement reaction has the form \(AB+CD\to AD + CB\). A combustion reaction is a reaction with oxygen that is usually exothermic and often involves a hydrocarbon reacting with oxygen to form \(CO_2\) and \(H_2O\).

Answer:

A. Synthesis