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law of simple multiple proportions
(Encyclopedia) law of simple multiple proportions, in chemistry, the statement that when two or more elements form more than one compound, the ratio of the weights of one element that combine with a…cresol
(Encyclopedia) cresolcresolkrēˈsōl [key], CH3C6H4OH, any one of three aromatic alcohols present in coal tar. The three compounds are structural isomers; they may be thought of as hydroxy derivatives…photocopying
(Encyclopedia) photocopying, process whereby written or printed matter is directly copied by photographic techniques. Generally, photocopying is practical when just a few copies of an original are…proline
(Encyclopedia) CE5 prolineprolineprōˈlēn [key], organic compound, one of the 20 amino acids commonly found in animal proteins. Only the l-stereoisomer appears in mammalian protein. It is not…hydrate
(Encyclopedia) hydratehydratehīˈdrāt [key], chemical compound that contains water. A common hydrate is the familiar blue vitriol, a crystalline form of cupric sulfate. Chemically, it is cupric…Proust, Joseph Louis
(Encyclopedia) Proust, Joseph LouisProust, Joseph Louiszhôzĕfˈ lwē pr&oomacr;st [key], 1754–1826, French chemist. He was professor of chemistry at the artillery school in Segovia, Spain, and…tear gas
(Encyclopedia) tear gas, gas that causes temporary blindness through the excessive flow of tears resulting from irritation of the eyes. The gas is used in chemical warfare and as a means for…lead acetate
(Encyclopedia) lead acetate, chemical compound, a white crystalline substance with a sweetish taste. Like other lead compounds, it is very poisonous. Lead acetate is soluble in water and glycerin.…Hyannis
(Encyclopedia) Hyannis Hyannis hīănˈĭs [key], resort village (2020 pop. 44,107), Barnstable co., SE Mass., on…pyrogallol
(Encyclopedia) pyrogallolpyrogallolpīˌrōgălˈōl [key] or pyrogallic acidpyrogallic acid–ĭk [key], C6H6O3, white, crystalline, aromatic compound with a biting taste; it is poisonous. It melts at 133℃…Trending
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