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  1. ...around the atom, and its bonds. In de-localized or conjugated systems , such as phenol, benzene and compounds such as haemoglobin and chlorophyll...

    分類:科學及數學 > 化學 2007年08月30日

  2. ...-H 鍵. 這很重要, 非常重要. 3. 失去氫離子後, 環狀電子共軛系統 ( conjugating system ) 共有6粒電子, 符合"4n+2" , 因此帶芳香環的特性, 變得更為穩定, 於是...

    分類:科學及數學 > 化學 2012年03月07日

  3. Furan has a cyclic compound, and its ring contains five members, fourcarbon atoms and one oxygen atom. All of the four carbon atoms are sp² hybridized. Among the three sp² obitals in each...

    分類:科學及數學 > 化學 2012年12月29日

  4. ...resonance describes the distribution of delocalized electrons in conjugated double-bond systems . examples are: - why phenol (C6H5-OH) is more...

    分類:科學及數學 > 化學 2010年09月28日

  5. ... also has lone pairs, which can be donated to the conjugated pi-bond system . this is particularly important in electrophilic substitution reactions on ...

    分類:科學及數學 > 化學 2011年04月22日

  6. ...surely only relatively, buffer is needed. Buffer is a system which contain a weak acid and it's conjugated base in a comparible amount. It can be prepared by mixing the...

    分類:科學及數學 > 化學 2008年03月18日

  7. ... acids. The relative stability of the conjugate base of the acid determines its acidity..., enol group, and the phenol group. In biological systems organic compounds containing only these...

    分類:科學及數學 > 化學 2009年04月15日

  8. Taking a damped spring-and-mass oscillation system as an example with the following parameters...; 0 Then (*) has 2 complex conjugate roots -p +/- iq and therefore x(t) is ...

  9. ...that between the centroid and the orthocenter. The isogonal conjugate of the orthocenter is the circumcenter. Four ...by the other three are called an orthocentric system or orthocentric quadrangle. Let A, B, ...

    分類:科學及數學 > 數學 2007年04月15日

  10. ...the negative charge (read: lone pair) can delocalize through pi-bond system by resonance. this greatly reduce the charge density on a particular... alkyl groups. solubility and polarity of conjugate base may also affect. 2010-11-23 19:08:19 補充: note that...

    分類:科學及數學 > 化學 2010年11月25日