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Hefei

(Encyclopedia)Hefei or Hofei both: hô-fā [key], city (1994 est. pop. 866,800), capital of Anhui prov., China. A rapidly growing industrial city, it has textile mills, ironworks and steelworks, chemical and food p...

Woburn, city, United States

(Encyclopedia)Woburn wo͞oˈbərn [key], city (1990 pop. 35,943), Middlesex co., NE Mass.; settled 1640, inc. as a city 1888. Formerly a major center for tanneries, the city has electrical, pharmaceutical, chemical...

Bergerac

(Encyclopedia)Bergerac bĕrzhəräkˈ [key], town, Dordogne dept., SW France, in Périgord, on the Dordogne...

zinc sulfate

(Encyclopedia)zinc sulfate, chemical compound ZnSO4, a very water soluble, transparent, colorless, crystalline compound. It is commonly used as the heptahydrate, ZnSO4·7H2O, and is commonly called white vitriol; i...

van't Hoff, Jacobus Hendricus

(Encyclopedia)van't Hoff, Jacobus Hendricus yäkōˈbəs hĕndrēˈkəs vänt hôf [key], 1852–1911, Dutch physical chemist. He taught at the universities of Amsterdam (1878–96) and Berlin (from 1896). For his ...

Willstätter, Richard

(Encyclopedia)Willstätter, Richard rĭkhˈärt vĭlˈshtĕtər [key], 1872–1942, German chemist. He was professor at the Kaiser Wilhelm Institute of Chemistry, Berlin (1912–16), and at the Univ. of Munich (191...

Botany Bay

(Encyclopedia)Botany Bay, inlet, New South Wales, SE Australia, just S of Sydney. It was visited in 1770 by James Cook, who proclaimed British sovereignty over the east coast of Australia. The site of the landing i...

Wallach, Otto

(Encyclopedia)Wallach, Otto, 1847–1931, German chemist, Ph.D. Univ. of Göttingen, 1869. Wallach was a professor at the Univ. of Bonn from 1870 to 1889 and at the Univ. of Göttingen from 1889 to 1915. In 1910 he...

terbium

(Encyclopedia)terbium tûrˈbēəm [key] [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.92535; m.p. 1,356℃; b.p. 3,123℃; sp. gr. about 8.25; valence +3 or +4....

silica

(Encyclopedia)silica or silicon dioxide, chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in sev...