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Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
The Gibbs phase rule states that under most thermodynamic conditions (fixed temperature, pressure, chemical potential, and other intensive thermodynamic properties), for each chemical species, only one phase is thermodynamically stable (i.e. have the lowest Gibbs free energy per volume), except on certain boundaries, such as the coexistence of ice and water right at the freezing point.
Chemical nomenclature, replete as it is with compounds with very complex names, is a repository for some names that may be considered unusual. A browse through the Physical Constants of Organic Compounds in the CRC Handbook of Chemistry and Physics (a fundamental resource) will reveal not just the whimsical work of chemists, but the sometimes peculiar compound names that occur as the ...
"Since that time the meaning of the prefix has been generalized to denote the replacement of one or more methyl groups by H, or the disappearance of CH 2 from a carbon chain". [4] At present, the meaning is restricted to denote the removal of only one group from the parent structure, rather than the completely demethylated form of the parent ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Disappearance of the boundary between two particles in contact, or between a particle and a polymer macrophase followed by changes of shape leading to a reduction of the total surface area. Note 1: Definition modified from that in ref. [2] Note 2: The coagulation of an emulsion, viz. the formation of aggregates, may be followed by coalescence.
In chemistry, a leaving group is defined by the IUPAC as an atom or group of atoms that detaches from the main or residual part of a substrate during a reaction or elementary step of a reaction. [1] However, in common usage, the term is often limited to a fragment that departs with a pair of electrons in heterolytic bond cleavage. [2]
In the early universe, it is thought that matter and antimatter were equally represented, and the disappearance of antimatter requires an asymmetry in physical laws called CP (charge–parity) symmetry violation, which can be obtained from the Standard Model, [51] but at this time the apparent asymmetry of matter and antimatter in the visible ...