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covenant

(Encyclopedia)covenant kŭvˈənənt [key], agreement entered into voluntarily by two or more parties to do or refrain from doing certain acts. In the Bible and in theology the covenant is the agreement or engageme...

Lafayette, Marie Joseph Paul Yves Roch Gilbert du Motier, marquis de

(Encyclopedia)Lafayette, or La Fayette, Marie Joseph Paul Yves Roch Gilbert du Motier, marquis de märēˈ zhôzĕfˈ pôl ēv rôk zhēlbĕrˈ dü môtyāˈ märkēˈ də läfāĕtˈ [key], 1757–1834, French gen...

Hannibal, Carthaginian general

(Encyclopedia)Hannibal hănˈəbəl [key], b. 247 b.c., d. 183 or 182 b.c. Carthaginian general, an implacable and formidable enemy of Rome. Although knowledge of him is based primarily on the reports of his enemie...

complex ion

(Encyclopedia)complex ion, charged molecular aggregate (see ion), consisting of a metallic atom or ion to which is attached one or more electron-donating molecules. In some complex ions, such as sulfate, SO4−2, t...

condensate

(Encyclopedia)condensate, matter in the form of a gas of atoms, molecules, or elementary particles that have been so chilled that their motion is virtually halted and as a consequence they lose their separate ident...

sulfate

(Encyclopedia)sulfate, chemical compound containing the sulfate (SO4) radical. Sulfates are salts or esters of sulfuric acid, H2SO4, formed by replacing one or both of the hydrogens with a metal (e.g., sodium) or a...

water

(Encyclopedia)CE5 A. Water molecule (black circles represent valence-shell electrons) B. Structure of ice: Each oxygen atom (white circles) is bonded to four other oxygen atoms by hydrogen bonds, the hydrogen at...

Cleveland, cities, United States

(Encyclopedia)Cleveland. 1 City (2020 pop. 372,674), seat of Cuyahoga co., NE Ohio, on Lake Erie at the mouth of the Cuyahoga River; laid out (1796) by Moses ...

oxidation and reduction

(Encyclopedia)oxidation and reduction, complementary chemical reactions characterized by the loss or gain, respectively, of one or more electrons by an atom or molecule. Originally the term oxidation was used to re...

Vatican Council, Second

(Encyclopedia)Vatican Council, Second, popularly called Vatican II, 1962–65, the 21st ecumenical council (see council, ecumenical) of the Roman Catholic Church, convened by Pope John XXIII and continued under Pau...