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This is a list of unsolved problems in chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem.
In physical and analytical chemistry, colorimetry or colourimetry is a technique used to determine the concentration of colored compounds in solution. [1] A colorimeter is a device used to test the magnitude of a solution by measuring its absorbance of a specific wavelength of light (not to be confused with the tristimulus colorimeter used to ...
The ammonia formed may be detected by its characteristic odor, and by damp red litmus paper's turning blue, signalling that it is an alkali — very few gases other than ammonia evolved from wet chemistry are alkaline. 3 NO − 3 + 8 Al + 5 OH − + 18 H 2 O → 3 NH 3 + 8 [Al(OH) 4] −. Aluminium is the reducing agent in this reaction that ...
In organic chemistry, the Cahn–Ingold–Prelog (CIP) sequence rules (also the CIP priority convention; named after Robert Sidney Cahn, Christopher Kelk Ingold, and Vladimir Prelog) are a standard process to completely and unequivocally name a stereoisomer of a molecule.
In physical chemistry, the Arrhenius equation is a formula for the temperature dependence of reaction rates.The equation was proposed by Svante Arrhenius in 1889, based on the work of Dutch chemist Jacobus Henricus van 't Hoff who had noted in 1884 that the van 't Hoff equation for the temperature dependence of equilibrium constants suggests such a formula for the rates of both forward and ...
In chemistry, a chemical reaction is said to be autocatalytic if one of the reaction products is also a catalyst for the same reaction. [1] Many forms of autocatalysis are recognized. [ 2 ] [ 3 ]
The development of electrospray ionization for the analysis of biological macromolecules [5] was rewarded with the attribution of the Nobel Prize in Chemistry to John Bennett Fenn and Koichi Tanaka in 2002. [6] One of the original instruments used by Fenn is on display at the Science History Institute in Philadelphia, Pennsylvania.
Transesterification is the process of exchanging the organic functional group R″ of an ester with the organic group R' of an alcohol.These reactions are often catalyzed by the addition of an acid or base catalyst. [1]