An oxide ofa nonmetal thatreacts with water to produce an acid or with abase to produce a salt and water. For exam-ple,sulfur(Ⅵ) oxide (sulfur trioxide) reactswith water to form sulfuric acid:SO3 +H2O→H2SO4and with sodium hydroxide to produce sodiumsulfat...[继续阅读]

    See acid salt参阅8页acid salt。...[继续阅读]

    A volumetric analysis or acid-base titration in which a standard solution ofan acid is gradually added to the unknown(base) solution containing an indicator. Inthe converse procedure,alkalimetry,the stan-dard solution is of a base and the unknownsolution ...[继续阅读]

    See dissociation constant参阅191页dissociation constant。...[继续阅读]

    See pollution.参阅463页pollution。...[继续阅读]

    A salt in which thereis only partial replacement of the acidic hy-drogen of an acid by metal or other cations.For polybasic acids the formulae for suchsalts are of the type NaHSO4(sodium hydro-gensulfate) and Na3H(CO3)2·2H2O (sodiumsesquicarbonate). For m...[继续阅读]

    Radiation that can causea chemical reaction; for example,ultravioletradiation is actinic.See also photochemistry能够引发化学反应的辐射,例如紫外辐射。参阅453页photochemistry。...[继续阅读]

    See actinoids参阅9页actinoids。...[继续阅读]

    A soft,silvery-white,highly ra-dioactive metallic element of group 3 (for-merly ⅢB) of the periodic table. It is usual-ly considered to be the first member of theACTINOID series. It occurs in minute quan-tities in uranium ores as a result of the natu-ral ...[继续阅读]

    The decrease in theatomic or ionic radius that occurs in the acti-noids as the atomic number increases fromactinium through nobelium. The increase inatomic number in the actinoids is associatedwith the filling of the inner 5f subshell. It issimilar to the...[继续阅读]