Chemical energetics is the study of energy changes that occur during chemical reactions. It focuses on how energy is absorbed or released when bonds are formed or broken. This concept is essential for understanding processes like combustion, photosynthesis, and respiration, where energy transformations play a crucial role. In chemical energetics, two key concepts are enthalpy and entropy. Enthalpy refers to the total heat content of a system, while entropy measures the disorder or randomness of particles. Together, these concepts help predict whether a reaction will occur spontaneously and how much energy will be involved in the process.