The spontaneous ionizationof excited atoms,ions or molecules as in theAuger effect.在俄歇效应中,激发态原子、离子或分子的自发电离。...[继续阅读]

    The meth-yl ester of salicylic acid,which occurs incertain plants. It is absorbed through theskin and used medicinally to relieve rheu-matic symptoms. It is also used in perfumesand as a flavoring agent in various foods.See salicylic acid.水杨酸的甲基酯,存在于某些植物中...[继续阅读]

    A natural or synthetic polymericelastic material. Natural rubber is a poly-mer of methylbuta-1,3-diene (iso-prene).Various synthetic rubbers aremade by polymerization; for examplechloroprene rubber (from 2-chlorobuta1,3-diene) and silicone rubbers.See als...[继续阅读]

    Having a va-lence of seven.化合价为7价的。...[继续阅读]

    A spectrum composed of anumber of discrete lines corresponding tosingle wavelengths of emitted or absorbedradiation. Line spectra are produced by at-oms or simple (monatomic) ions in gases.Each line corresponds to a change in elec-tron orbit,with emission...[继续阅读]

    A compound prepared by dissolving eitherexcess copper(Ⅱ) oxide or copper(Ⅱ) car-bonate in dilute nitric acid.On crystalliza-tion,deep blue crystals of the trihydrate(Cu(NO3)2·3H2O)are obtained.Thecrystals are prismatic in shape and are ex-tremely deliques...[继续阅读]

    A colligativeproperty of solutions in which the boilingpoint of a solution is raised relative to thatof the pure solvent. The elevation is direct-ly proportional to the number of solutemolecules introduced rather than to anyspecific aspect of the solute c...[继续阅读]

    A reaction with oxygen withthe production of heat and light. The com-bustion of solids and liquids occurs whenthey release flammable vapor,which reactswith oxygen in the gas phase. Combustionreactions usually involve a complex se-quence of free-radical ch...[继续阅读]

    A white solidformed either by the action of carbon onsodamide at high temperature or by pass-ing ammonia over sodium at 300-400℃ toform sodamide and reacting it with carbon.The industrial salt is prepared by the Castnerprocess and purified by recrystalliz...[继续阅读]

    An electrode in contact with asolution of ions.In general there will be ane.m.f.set up between electrode and solu-tion by transfer of electrons to or from theelectrode. The e. m. f. of a half cell cannotbe measured directly since setting up a cir-cuit res...[继续阅读]