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Ebook Dictionary of chemistry (2nd edition): Part 2

(BQ) There are also biographical entries on key figures, highlighted entries on major topics such as polymers and crystal defects, and chronologies charting the main discoveries in atomic theory, biochemistry, explosives, and plastics. A new feature is the inclusion of entry-level web links. | I I See iodine. IBA See indolebutyric acid. IBIB See isobutyl isobutyrate. ibogaine [ORG CHEM] C26H32O2N2 An alkaloid isolated from the stems and leaves of the shrub Tabernanthe iboga, crystallizing from absolute ethanol as prismatic needles, melting at 152–153ЊC, soluble in ethanol, ether, and chloroform; used in medicine. { ə boиgə en } ¯ ¯ ice [PHYS CHEM] 1. The dense substance formed by the freezing of water to the solid state; has a melting point of 32ЊF (0ЊC) and commonly occurs in the form of hexagonal crystals. 2. A layer or mass of frozen water. { ıs } ¯ ice color See azoic dye. { ıs kəlиər } ¯ ice crystal [PHYS CHEM] Any one of a number of macroscopic crystalline forms in which ice appears, including hexagonal columns, hexagonal platelets, dendritic crystals, ice needles, and combinations of these forms; although the crystal lattice of ice is hexagonal in its symmetry, varying conditions of temperature and vapor pressure can lead to growth of crystalline forms in which the simple hexagonal pattern is almost undiscernible. { ıs kristиəl } ¯ ice needle [PHYS CHEM] A long, thin ice crystal whose cross section perpendicular to its long dimension is typically hexagonal. Also called ice spicule. { ıs nedиəl } ¯ ¯ ice point [PHYS CHEM] The true freezing point of water; the temperature at which a mixture of air-saturated pure water and pure ice may exist in equilibrium at a pressure of 1 standard atmosphere (101,325 pascals). { ıs point } ¯ ˙ ice spicule See ice needle. { ıs ¦spikиyəl } ¯ ice splinters [PHYS CHEM] Minute, electrically charged fragments of ice which have been observed under laboratory conditions to be torn away from dendritic crystals or spatial aggregates exposed to moving air. { ıs ¦splinиtərz } ¯ ICP-AES See inductively coupled plasma-atomic emission spectroscopy. IDA See iminodiacetic acid. ideal solution [CHEM] A solution that conforms to Raoult’s law over all ranges of temperature and concentration and shows no internal energy change on .