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The erg is a unit of energy equal to 10−7 joules. It originated in the Centimetre–gram–second system of units (CGS). It has the symbol erg. The erg is not an SI unit. Its name is derived from ergon (ἔργον), a Greek word meaning 'work' or 'task'.
The mole (symbol mol) is a unit of measurement, the base unit in the International System of Units (SI) for amount of substance, a quantity proportional to the number of elementary entities of a substance. One mole contains exactly 6.02214076×1023 elementary entities (approximately 602 sextillion or 602 billion times a trillion), which can be atoms, molecules, ions, or other particles. The number of particles in a mole is the Avogadro number (symbol N0) and the numerical value of the Avogadro constant (symbol NA) expressed in mol-1. The value was chosen based on the historical definition of the mole as the amount of substance that corresponds to the number of atoms in 12 grams of 12C, which made the mass of a mole of a compound expressed in grams, numerically equal to the average molecular mass of the compound expressed in daltons. With the 2019 redefinition of the SI base units, the numerical equivalence is now only approximate but may be assumed for all practical purposes.
The data below tabulates standard electrode potentials (E°), in volts relative to the standard hydrogen electrode, at:
A metalloid is a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. There is no standard definition of a metalloid and no complete agreement on which elements are metalloids. Despite the lack of specificity, the term remains in use in the literature of chemistry. Metalloids typically have a metallic appearance but are brittle and not as malleable as metals.
Nonmetals in chemistry or non-metallic elements are chemical elements that have high electronegativity and mostly lack distinctive metallic properties. They range from colorless gases like hydrogen to shiny crystals like iodine. Physically, they are usually lighter than metals and are often poor conductors of heat and electricity. Since nonmetals have high electronegativity they usually attract electrons in a chemical bond with another element, and their oxides tend to be acidic.
Silicon tetrachloride or tetrachlorosilane is the inorganic compound with the formula SiCl4. It is a colorless volatile liquid that fumes in air. It is used to produce high purity silicon and silica for commercial applications. It is a part of the chlorosilane family.
Freezing-point depression is a drop in the maximum temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added. Examples include adding salt into water, alcohol in water, ethylene or propylene glycol in water, adding copper to molten silver, or the mixing of two solids such as impurities into a finely powdered drug.
In chemistry, a reactivity series (or reactivity series of elements) is an empirical, calculated, and structurally analytical progression of a series of metals, arranged by their "reactivity" from highest to lowest. It is used to summarize information about the reactions of metals with acids and water, single displacement reactions and the extraction of metals from their ores.
In thermodynamics, the cryoscopic constant, Kf, relates molality to freezing point depression. It is the ratio of the latter to the former:
Mark Sebastian Wainwright is an Australian chemical engineer and emeritus professor of the University of New South Wales, and institutional leader within the Australian academic and technological sectors. He served as seventh vice chancellor and president of the UNSW from 2004 to 2006. In 2004 he was appointed a member of the Order of Australia for services to chemical engineering as a researcher and academic, and to tertiary education. In 2007 he was awarded an honorary doctorate of science by the University of New South Wales. He was born 20 Oct.,1943.
The Royal Australian Chemical Institute (RACI) is both the qualifying body in Australia for professional chemists and a learned society promoting the science and practice of chemistry in all its branches. The RACI hosts conferences, seminars and workshops. It is the professional body for chemistry in Australia, with the ability to award the status of Chartered Chemist (CChem) to suitably qualified candidates.
Henry George Smith was an Australian chemist whose pioneering work on the chemistry of the essential oils of the Australian flora achieved worldwide recognition.
Sir Ronald Sydney Nyholm was an Australian chemist who was a leading figure in inorganic chemistry in the 1950s and 1960s.
Francis Patrick John Dwyer FAA was Professor of Chemistry, Australian National University, Canberra. He was one of the most distinguished scientists Australia has produced. At the time of his death in 1962 he was widely recognised as a leading authority in inorganic chemistry, and had laid the foundation in Australia for a new field of research bridging science and medicine—biological inorganic chemistry. His influence as a teacher and as a researcher was widespread.
Donald Herman Voet was an American biochemist who was emeritus associate professor of chemistry at the University of Pennsylvania. His laboratory used x-ray crystallography to understand structure-function relationships in proteins. He and his wife, Judith G. Voet, are authors of biochemistry text books that are widely used in undergraduate and graduate curricula.
This is a list of 194 sources that list elements classified as metalloids. The sources are listed in chronological order. Lists of metalloids differ since there is no rigorous widely accepted definition of metalloid. Individual lists share common ground, with variations occurring at the margins. The elements most often regarded as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Other sources may subtract from this list, add a varying number of other elements, or both.
The metallic elements in the periodic table located between the transition metals to their left and the chemically weak nonmetallic metalloids to their right have received many names in the literature, such as post-transition metals, poor metals, other metals, p-block metals and chemically weak metals. The most common name, post-transition metals, is generally used in this article.
Benjamin Klaas Selinger FRACI CChem is an Australian chemist, for many years a professor with the chemistry department of the Australian National University, later head of department and Professor Emeritus. He is perhaps best known as a consumer advocate and author. His Chemistry in the Marketplace, first published in 1968, is from June 2017 in its sixth edition.
References
- ↑ "A lunch half a century later". University of New South Wales. 22 March 2004. Archived from the original on 29 July 2008. Retrieved 7 May 2008.
- ↑ "The university's first graduates". University of New South Wales. Archived from the original on 27 July 2008. Retrieved 7 May 2008.
- 1 2 3 "Product Information SI Chemical Data". Booktopia. Retrieved 7 May 2008.
- ↑ Aylward, G. H; Findlay, T. J. V. (Tristan John Victor) (2008), SI chemical data (6th ed.), John Wiley & Sons Australia, ISBN 978-0-470-81638-7
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