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[20] The 2006 4th edition of "Chemistry: The Molecular Nature of Matter and Change" by Silberberg on p. xviii states "Chapter 20 has been completely rewritten to reflect a new approach to the coverage of entropy. The vague notion of "disorder" (with analogies to macroscopic systems) has been replaced with the idea that entropy is related to the ...
The CRC Handbook of Chemistry and Physics is a comprehensive one-volume reference resource for science research. First published in 1914, it is currently (as of 2024 [update] ) in its 105th edition, published in 2024.
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.
Recognition status, as metalloids, of some elements in the p-block of the periodic table. Percentages are median appearance frequencies in the lists of metalloids. [n 2] The staircase-shaped line is a typical example of the arbitrary metal–nonmetal dividing line found on some periodic tables.
Chromium(II) acetate, Cr 2 (μ-O 2 CCH 3) 4 (H 2 O) 2, was the first chemical compound containing a quadruple bond to be synthesized. It was described in 1844 by E. Peligot, although its distinctive bonding was not recognized for more than a century.
The solution chemistry of bismuth is characterised by the formation of oxyanions; [152] it forms anionic bismuthates in strongly basic solutions. [citation needed] Bismuth forms Zintl phases such as NaBi, [153] Rb 7 In 4 Bi 6 [154] and Ba 11 Cd 8 Bi 14. [155]
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 ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).