What type of reaction is represented by the equation: 2H₂ + O₂ → 2H₂O?

The reaction represented by the equation 2H₂ + O₂ → 2H₂O is a synthesis reaction. In a synthesis reaction, two or more reactants combine to form a single product, which is precisely what happens here; hydrogen and oxygen gas combine to form water.

While combustion reactions often involve reactions like hydrogen with oxygen to release energy in the form of heat, the core aspect of this particular reaction is focused on the formation of a new compound, which is water. The terms used here tend to mingle, but as per the strict definitions in chemistry, this specific example primarily illustrates synthesis rather than combustion.

Additionally, although the reaction is exothermic, as it releases energy in the form of heat, that characteristic distinctly categorizes it but does not define the fundamental type of reaction occurring. Therefore, the main identifying feature of the reaction in question is its classification as a synthesis reaction, combining elements to create a compound.