Final answer:
The reaction of a single H atom with O2, producing OH and O, is known as a radical reaction. It is an oxidation reaction where hydrogen is removed from the substrate.
Step-by-step explanation:
The reaction of a single H atom with O2, producing OH and O, is known as a radical reaction. This reaction is a type of oxidation-reduction reaction, specifically an oxidation reaction where hydrogen is removed from the substrate. It is important to note that oxygen is not being added to the original reactant molecule in this particular reaction.