How can temperature change help determine the type of a reaction?

In the context of chemical reactions, the relationship between temperature change and the type of reaction is fundamentally tied to the energy exchanges that occur during those reactions. An endothermic reaction absorbs heat from its surroundings, which leads to a decrease in the temperature of the environment. When you observe a drop in temperature, it suggests that the reaction is taking in energy from the surroundings, and therefore, it is endothermic.

On the other hand, an exothermic reaction releases heat into the surroundings, resulting in an increase in temperature. When you see a rise in temperature, it indicates that energy is being released, and thus, the reaction is exothermic.

This principle is essential in distinguishing between these two types of reactions based on the temperature changes observed. Understanding these concepts helps in predicting how a given reaction will behave in terms of thermal energy exchange, enabling a better grasp of thermodynamics in chemical processes.