What is an example of an exothermic reaction?

An exothermic reaction is characterized by the release of heat energy into the surroundings. This heat release often results in an increase in temperature in the environment around the reaction. In the case of fire, the combustion process is a perfect example of an exothermic reaction. When materials burn, they undergo a chemical change that releases heat and light, which is why fire feels hot and can be used for warmth or cooking.

For instance, during the combustion of wood, oxygen from the air reacts with the carbon and hydrogen in the wood, producing carbon dioxide and water vapor while emitting heat and light. This is a prime illustration of an exothermic reaction in action.

Other options like water boiling and melting ice are endothermic processes because they absorb heat from their surroundings to change state. Similarly, photosynthesis is an endothermic reaction, as it requires energy from sunlight to convert carbon dioxide and water into glucose and oxygen. Therefore, fire stands out as the example of an exothermic reaction, demonstrating the characteristic heat release typical of such reactions.