The total internal energy (E) of a chemical system equals the sum of the kinetic and potential energies of all the particles in the system. The sum of all the energies due to the motions of the particles in a system is a form of specifically called thermal energy. The energy in a chemical system that results primarily from the arrangement of the nuclei and electrons within an atom or specifically called compound is a form of work, or both. Changes in the internal energy of a system take place when energy is transferred as When a chemical reaction produces a gas, the newly formed gas pushes away the atmosphere and creates space for itself such that the system loses energy as
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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