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

Understanding the Reaction Type

1. Break Down the Problem

   • The problem requires identifying the type of chemical reaction based on the energy levels of the reactants and products.

2. Relevant Concepts

   • In chemical reactions, if the products have lower energy than the reactants, this indicates that energy has been released during the reaction.

3. Analysis and Detail

   • When a reaction's energy level decreases from reactants to products, it suggests an exothermic process. In exothermic reactions, energy is released into the surroundings, often in the form of heat.

4. Verify and Summarize

   • Thus, in summary, since the products are at a lower energy level than the reactants in the diagram, this indicates that the reaction is exothermic.

Final Answer

The diagram represents an exothermic reaction.