Final answer:
Enthalpy change is a measurement used to express the heat evolved or absorbed in a chemical reaction and it's typically measured in joules. Calorimetry is employed to measure this change by recording temperature changes in the system.
Step-by-step explanation:
A common measurement used when discussing the relationship between energy and chemical changes is the enthalpy change. Enthalpy change is a measure of the heat evolved or absorbed in a chemical reaction, and it can be expressed using thermochemical equations. It is essential to understand that during chemical reactions, energy changes occur, and these are typically measured in joules.
One method to measure enthalpy change is through calorimetry, a technique used to measure the heat transfer involved in a chemical or physical process. This involves the use of a calorimeter to record the temperature change which in turn is used to calculate the amount of heat transferred. Understanding this exchange of energy requires defining the system, which is the matter under observation, and the surroundings, consisting of everything outside the system that interacts with it energy-wise.