acid base
81acid salt — Chem. a salt of a polybasic acid that is only partially neutralized by a base; a salt that is also an acid. [1720 30] * * * ˌacid ˈsalt 7 [acid salt] noun (chemistry) a salt formed when the ↑hydrogen of an acid is not completely replaced …
82base — I. /beɪs / (say bays) noun 1. the bottom of anything, considered as its support; that on which a thing stands or rests. 2. a fundamental principle or groundwork; foundation; basis. 3. Architecture a. the part of a column on which the shaft… …
83base pair — Abbreviation: bp The two separate strands of a nucleic acid double helix are held together by specific hydrogen bonding between a purine and a pyrimidine, one from each strand. The base A pairs with T in DNA (with U in RNA); while G pairs with C… …
84base pair — noun one of the pairs of chemical bases joined by hydrogen bonds that connect the complementary strands of a DNA molecule or of an RNA molecule that has two strands; the base pairs are adenine with thymine and guanine with cytosine in DNA and… …
85Base dure — Une base dure est une base de Lewis dont le centre donneur d électrons est peu polarisable. Il s agit en général d une molécule petite et fortement chargée qui contient des atomes très électronégatifs et peu polarisables. L opposé d une base dure …
86Base molle — Une base molle est une base volumineuse et peu chargée contenant des atomes peu électronégatifs et très polarisables. L opposé d une base molle est une base dure. Le critère de dureté d une base est utilisé dans le principe HSAB (Hard ans Soft… …
87base — 1. n. & v. n. 1 a a part that supports from beneath or serves as a foundation for an object or structure. b a notional structure or entity on which something draws or depends (power base). 2 a principle or starting point; a basis. 3 esp. Mil. a… …
88Base — 1. n. & v. n. 1 a a part that supports from beneath or serves as a foundation for an object or structure. b a notional structure or entity on which something draws or depends (power base). 2 a principle or starting point; a basis. 3 esp. Mil. a… …
89Base metal — In chemistry, the term base metal is used informally to refer to a metal that oxidizes or corrodes relatively easily, and reacts variably with diluted hydrochloric acid (HCl) to form hydrogen. Examples include iron, nickel, lead and zinc. Copper… …
90Base metal — Metal Met al (? or ?; 277), n. [F. m[ e]tal, L. metallum metal, mine, Gr. ? mine; cf. Gr. ? to search after. Cf. {Mettle}, {Medal}.] 1. (Chem.) An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than …
