The diagram shows that the energy of the products is higher than the energy of the reactants. Therefore, the diagram represents a(n) reaction.

The diagram you are referring to indicates that the energy of the products is higher than that of the reactants, which suggests that energy is absorbed during the reaction. This type of reaction is categorized as an endothermic reaction.

In an endothermic reaction, reactants absorb energy from their surroundings, resulting in products that have higher internal energy. This is often due to the breaking of bonds in the reactants, which requires energy input. Common examples include photosynthesis and the thermal decomposition of certain compounds.

In summary, since the products' energy level is greater than that of the reactants, the diagram indeed represents an endothermic reaction.