發問於 科學及數學化學 · 1 十年前

為何磷會在空氣中自然燃燒?

為何磷會在空氣中自然燃燒?

Why phosphorus burns spontaneously in air?

請用A-Level 程度的知識去解答,如(bond angle, dipole moment... etc)

Please use the knowledge in A-Level Chemistry to explain. For example: bond angle, dipole moment, BP-BP replusion... etc)

更新:

bond angle, dipole moment 等等只是例子, 與問題的答案沒有任何必然性

更新 2:

感謝回答! 我都應該指明係white/yellow phosphorus!

2 個解答

評分
  • ?
    Lv 7
    1 十年前
    最愛解答

    又見廣告, 又是代餐, 又是這公司. 討爾死了.

    你見過保健知識那邊的情況嗎? 每一個問題都給三四個這樣的廣告塞滿了,

    我見過最誇張的, 一題中有十一個廣告.

    回說題目了.

    LOK, this is actually related to bond angle and bond-bond repulsion.

    phosphorus, or more specifically, white phosphorus, exists as simple molecule, P4.

    the optimal bond angle for sp3-hybridized P atom is 109.5 degrees.

    however, for P4 which adopts tetrahedral shapes, the bond angle is almost only 60*.

    the bond-pairs have strong repulsion against the others, while the high ring strain speeds up breaking of the ring structure. the P4 is not very stable even under room conditions.

    as a result, upon spontaneous cleavage of the P-P bond (which has low activation energy), it's prone to rapid oxidation in air, leading to spontaneous ignition.

    red phosphorus and others are also allotropes of phosphorus, yet they're stable under air and room conditions. you have to specify which allotropes next time.

  • LOK
    Lv 5
    1 十年前

    關bonding, diploe moment, BP-BP repulsion咩事!?

還有問題嗎?立即提問即可得到解答。