in ionic solids? * Stoichiometry may be defined as a stat for ionic compounds wherein there is the exact ratio of cations to anions as predicted by the chemical formula. Nonstoichiometry may occur for some ceramic materials, such as FeO and CuO, in which two valence (or ionic) states exist for one of the ion types. The ratio of cations to anions is not altered by the formation of either a Frenkel or a Schottky defect. The equilibrium numbers of Frenkel an
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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