Sign conventions for Heat (g) and Work (w) : The change in internal energy of a system can be measured if you know whether heat flows in or out of the system and if the system does work on the surroundings or has work done upon it by the surroundings. Stated as an equation, the first law takes the following form: AE = q + w where E = internal energy, q = heat, and w = work Work done by system ( ) Work done on system ( ) SYSTEM AU = q + w Heat out ( ) thermic) Heat in () thermic) 4
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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