Final answer:
In an exothermic reaction, the bonds in the products are stronger than the bonds in the reactants, resulting in energy release in the form of heat.
Step-by-step explanation:
In an exothermic reaction, the bonds in the product have higher bond energy (stronger bonds) than the reactants. The energy of the products is lower than the energy of the reactants, resulting in an energetically downhill reaction. Heat is given off during an exothermic reaction, and it flows from the system to its surroundings, making the surroundings warm.