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silicon carbide

(Encyclopedia)silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under su...

Rueil-Malmaison

(Encyclopedia)Rueil-Malmaison rüĕˈyə-mälmāzôNˈ [key], town (1990 pop. 67,323), Hauts-de-Seine dept., N central France. It is an industrial center where metals, armaments, photographic equipment, film, pharm...

carbon tetrachloride

(Encyclopedia)carbon tetrachloride tĕˌtrəklôrˌəmĕthˈān [key], CCl4, colorless, poisonous, liquid organic compound that boils at 76.8℃. It is toxic when absorbed through the skin or when inhaled. It react...

Pontiac, city, United States

(Encyclopedia)Pontiac, industrial city (1990 pop. 71,166), seat of Oakland co., SE Mich., on the Clinton River; founded 1818 by promoters from Detroit, inc. as a city 1861. Industries developed early and expanded a...

Opole

(Encyclopedia)Opole ôpôˈlĕ [key], Ger. Oppeln, city (1992 est. pop. 129,000), capital of Opolskie prov., S Poland, on the Oder River. A river port and rail junction, it is also an important trade center, with m...

element

(Encyclopedia)CE5 element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means o...

valence, in chemistry

(Encyclopedia)valence, combining capacity of an atom expressed as the number of single bonds the atom can form or the number of electrons an element gives up or accepts when reacting to form a compound. Atoms are c...

chelating agents

(Encyclopedia)chelating agents kēˈlātĭng [key]. Certain organic compounds are capable of forming coordinate bonds (see chemical bond) with metals through two or more atoms of the organic compound; such organic ...

Irkutsk

(Encyclopedia)Irkutsk ĭrko͞otskˈ [key], city (1989 pop. 626,000), capital of Irkutsk region, S Siberian Russia, at the confluence of the Angara and Irkut rivers. It is an industrial center, a port, the site of a...

Mudéjar

(Encyclopedia)Mudéjar mo͞oᵺāˈhär [key], name given to the Moors who remained in Spain after the Christian reconquest but were not converted to Christianity, and to the style of Spanish architecture and decor...