See ethyne.参阅 ethyen。...[继续阅读]

    See ethanoyl group.参阅 ethanoy group。...[继续阅读]

    See carbide.参阅 carbide。...[继续阅读]

    See carbon.参阅 carbon。...[继续阅读]

    Describing a molecule that doesnot exhibit optical activity.用以描述不存在旋光性的分子。...[继续阅读]

    A substance that gives rise to hydro-gen ions (or H3 O+) when dissolved in wa-ter. An acid in solution will have a pH be-low 7. This definition does not take into ac-count the competitive behavior of acids insolvents and it refers only to aqueous sys-tems...[继续阅读]

    A type of organic com-pound of general formula RCOOCOR′,where R and R′are alkyl or aryl groups.They are prepared by reaction of an acylhalide with the sodium salt of a carboxylicacid,e. g. :RCOCl+R′COO-Na+ →RCOOCOR′+NaClLike the acyl halides,they are very...[继续阅读]

    An indicator that iseither a weak base or a weak acid andwhose dissociated and undissociated formsdiffer markedly in color. The color changemust occur within a narrow pH range. Ex-amples are methyl orange and phenol-phthalein.一种为弱酸或弱碱的指示剂。其解离和未解离状态的颜色有...[继续阅读]

    The sodium salts of organicacids used in the dyeing of silks and wool.They are so called because they are appliedfrom a bath acidified with dilute sulfuric orethanoic acid.用于丝绸和羊毛染色的有机酸的钠盐。由于是在经稀硫酸或醋酸酸化后使用,故得名。...[继续阅读]

    See acyl halide.参阅 acyl halide。...[继续阅读]