See ethyne.參閱 ethyen。...[繼續(xù)閱讀]

    See ethanoyl group.參閱 ethanoy group。...[繼續(xù)閱讀]

    See carbide.參閱 carbide。...[繼續(xù)閱讀]

    See carbon.參閱 carbon。...[繼續(xù)閱讀]

    Describing a molecule that doesnot exhibit optical activity.用以描述不存在旋光性的分子。...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]

    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.一種為弱酸或弱堿的指示劑。其解離和未解離狀態(tài)的顏色有...[繼續(xù)閱讀]

    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.用于絲綢和羊毛染色的有機(jī)酸的鈉鹽。由于是在經(jīng)稀硫酸或醋酸酸化后使用,故得名。...[繼續(xù)閱讀]

    See acyl halide.參閱 acyl halide。...[繼續(xù)閱讀]