Columbia Encyclopedia

Search results

500 results found

Le Châtelier's principle

(Encyclopedia)Le Châtelier's principle, chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components...

stannic

(Encyclopedia)stannic: a chemical compound containing tin in the +4 valence state. ...

stannous

(Encyclopedia)stannous: a chemical compound containing tin in the +2 valence state. ...

activation energy

(Encyclopedia)CE5 Energy profile of an exothermic reaction: Although the total energy of the products is less than that of the reactants, the activation energy must be added to weaken or break existing bonds bef...

designer drug

(Encyclopedia)designer drug, chemical substance synthesized in a laboratory that is intended to have effects similar to those of a drug that is a controlled substance, such as methamphetamine, marijuana, LSD, or an...

Lyly, John

(Encyclopedia)Lyly or Lilly, John both: lĭlˈē [key], 1554?–1606, English dramatist and prose writer. An accomplished courtier, he also served as a member of Parliament from 1589 to 1601. His Euphues, published...

free port

(Encyclopedia)free port, port, or section of a port, exempt from customs regulations (see tariff). Goods may be landed at a free port for storage and handling, and they may even be processed into manufactured goods...

Julia

(Encyclopedia)Julia, feminine name in the Julian gens. 1 Died 54 b.c., daughter of Julius Caesar and wife of Pompey. By her grace and tact she maintained the bond between her father and her husband. After her death...

CN (tear gas)

(Encyclopedia)CN, ordinary tear gas. The chemical name for CN is chloroacetophenone. ...

Monroeville

(Encyclopedia)Monroeville, borough (1990 pop. 29,169), Allegheny co., SW Pa., a suburb of Pittsburgh; settled 1810, inc. 1952. It is primarily residential, with a major shopping mall. Monroeville has chemical and n...