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 geared up 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 beneficial brief biographies of top scientists, full-page illustrated positive aspects on matters corresponding to the sunlight process and Genetically transformed Organisms, and chronologies of particular clinical matters together with plastics, electronics, and cellphone biology. This re-creation contains improved insurance of world warming, forensic technological know-how, astrophysics, quantum thought, and the sunlight process. Supported by way of over 2 hundred diagrams and illustrations, the Dictionary of technology additionally comprises prompt internet hyperlinks for lots of entries, accessed and stored modern through the significant other web site. eventually, it has appendices on SI devices, basic constants, geological time scale, a simplified category of the plant and animal kingdoms, and the periodic desk. either concise and wide-ranging, this quantity is a perfect reference paintings for college kids or for a house library.
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Extra info for A Dictionary of Science, Sixth Edition (Oxford Paperback Reference)
Alkyl benzenes can be made by the *Friedel–Crafts reaction. g. methyl group, CH3–, derived from methane. alkyl halides See . alkynes (acetylenes) Unsaturated hydrocarbons that contain one or more triple carbon–carbon bonds in their molecules. In systematic chemical nomenclature alkyne names end in the sufÜx -yne. Alkynes that have only one triple bond form a *homologous series: ethyne (acetylene), CH≡CH, propyne, CH3CH≡CH, etc. They can be made by the action of potassium hydroxide in alcohol solution on haloalkanes containing halogen atoms on adjacent carbon atoms; for example: RCHClCH2Cl + 2KOH → 2KCl + 2H2O + RCH≡CH Like *alkenes, alkynes undergo addition reactions.
Soluble salts (‘hydrochlorides’). If alkali (sodium hydroxide) is added to solutions of such salts the free amine is liberated. If all four hydrogen atoms of an ammonium salt are replaced by organic groups a quaternary ammonium compound is formed. Such compounds are made by reacting tertiary amines with halogen compounds; for example, trimethylamine ((CH3)3N) with chloromethane (CH3Cl) gives tetramethylammonium chloride, (CH3)4N+Cl–. Salts of this type do not liberate the free amine when alkali is added, and quaternary hydroxides (such as (CH3)4N+OH–) can be isolated.
Pure alu- aluminium hydroxide 29 minium is soft and ductile but its strength can be increased by work-hardening. A large number of alloys are manufactured; alloying elements include copper, manganese, silicon, zinc, and magnesium. Its lightness, strength (when alloyed), corrosion resistance, and electrical conductivity (62% of that of copper) make it suitable for a variety of uses, including vehicle and aircraft construction, building (window and door frames), and overhead power cables. 1% by weight) it was not isolated until 1825 by H.