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第一種: permanant dipole-permanant dipole interaction(Keesom force)

故名思義係講緊一些permanant polar molecules 既attraction, 因為佢地係polar, 所以佢地會有^+極同^-極, 形成好似bar magnet相吸咁既arrangement, 佢地異極相吸果個力就係Keesom force(directional force).要注意既係只有係佢地既attractive energy>thermal energy時先會有Keesom force存在,ie: solid或liquid的狀態先有.

eg: HF, H2O兩個例子就有Keesom force形成的attraction(當thermal energy

小於Keesom force)

第二種permanant dipole-induced dipole inteacrtion(Debye force)

Debye force的形成需要有兩種molecules, 分別為permanant dipole molecules同埋接近non polar的molecules. permanant dipole molecules會distort non-polar molecules既electrons cloud,即係話 non-polar molecules會暫時split開兩個極變成polar molecules , 同時個distorted electrons cloud會跟permanant dipole molecule既^+極相吸, 形成一個暫時性既attraction force, 這就是Debye force了.一但permanant dipole molecules消失, distorted electrons cloud會還原回原來位置, 變回non-polar molecules, Debye force也就不存在了

Update:

http://hk.knowledge.yahoo.com/question/question?qi...

Please translate all thiese into English^^ The link is up there

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