By John Daintith and Elizabeth Martin (Editors)
Hailed as "handy and readable" (Nature) and "well worthy looking" (New Scientist), this best-selling dictionary comprises 9,200 alphabetically prepared entries on all features of chemistry, physics, biology (including human biology), earth sciences, and astronomy. as well as a wealth of trustworthy, updated entries, clients will locate invaluable brief biographies of prime scientists, full-page illustrated gains on topics corresponding to the sun approach and Genetically transformed Organisms, and chronologies of particular medical topics together with plastics, electronics, and mobile biology. This re-creation contains increased assurance of worldwide warming, forensic technological know-how, astrophysics, quantum concept, and the sunlight process. Supported via over two hundred diagrams and illustrations, the Dictionary of technology additionally includes suggested net hyperlinks for lots of entries, accessed and saved brand new through the spouse web site. ultimately, it has appendices on SI devices, primary constants, geological time scale, a simplified class of the plant and animal kingdoms, and the periodic desk. either concise and wide-ranging, this quantity is a perfect reference paintings for college students or for a house library.
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Extra info for A Dictionary of Science, Sixth Edition (Oxford Paperback Reference)
Amides 1. NH2 (the amide group). Compounds containing this group are primary amides. Secondary and tertiary amides can also exist, in which the hydrogen atoms on the nitrogen are replaced by one or two other organic groups respectively. Simple examples of primary amides are ethanamide, CH3CONH2, and propanamide, C2H5CONH2. They are made by heating the ammonium salt of the corresponding carboxylic acid. Amides can also be made by reO R C amide group NH2 Amide structure. action of ammonia (or an amine) with an acyl halide.
G. KNH2 and Cd(NH2)2. They are formed by the reaction of ammonia with electropositive metals. A • Information about IUPAC nomenclature amination A chemical reaction in which an amino group (–NH2) is introduced into a molecule. Examples of amination reaction include the reaction of halogenated hydrocarbons with ammonia (high pressure and temperature) and the reduction of nitro compounds and nitriles. amines Organic compounds derived by replacing one or more of the hydrogen atoms in ammonia by organic groups (see illustration).
It occurs naturally as the mineral mascagnite. Ammonium sulphate was formerly manufactured from the ‘ammoniacal liquors’ produced during coal-gas manufacture but is now produced by the direct reaction between ammonia gas and sulphuric acid. It is decomposed by heating to release ammonia (and ammonium hydrogensulphate) and eventually water, sulphur dioxide, and ammonia. Vast quantities of ammonium sulphate are used as fertilizers. amoeboid movement amniocentesis The taking of a sample of amniotic Ûuid from a pregnant woman to determine the condition of an unborn baby.
A Dictionary of Science, Sixth Edition (Oxford Paperback Reference) by John Daintith and Elizabeth Martin (Editors)