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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.
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.
Mound Builders of Ancient America: The Archeology of a Myth (New York Graphic Society, 1968); Silverberg's fourth-most widely held work in WorldCat libraries; The Realm of Prester John (1972) Drug Themes in Science Fiction (1974) Reflections and Refractions: Thoughts on Science Fiction, Science and Other Matters (1997; revised & expanded ...
[1] [2] As water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry. Since water is frequently used as the solvent in experiments, the word solution refers to an aqueous solution, unless the solvent is specified. [3] [4] A non-aqueous solution is a solution in which the solvent is a liquid, but is ...
The enthalpy of solution is the solution enthalpy minus the enthalpy of the separate systems, whereas the entropy of solution is the corresponding difference in entropy. The solvation energy (change in Gibbs free energy) is the change in enthalpy minus the product of temperature (in Kelvin) times the change in entropy. Gases have a negative ...
At pH just below 5.5 the main species present in a 5 μM solution of Al 3+ are aluminium hydroxides Al(OH) 2+, AlOH + 2 and Al 13 (OH) 7+ 32, but on raising the pH Al(OH) 3 precipitates from the solution. This occurs because Al(OH) 3 has a very large lattice energy. As the pH rises more and more Al(OH) 3 comes out of solution.
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).
The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1. (for predictions) Cotton, Simon (2006). Lanthanide and Actinide Chemistry. John Wiley & Sons Ltd. Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties".