查看完整版本 : [del]thanks jmole, Znlaz ,亢龍無悔, much appreciated :)

chomool 2013-5-12 04:51 PM

[del]thanks jmole, Znlaz ,亢龍無悔, much appreciated :)

Is it because the long hydrocarbon chains are large in molecular size that they have strong repulsion between molecules that they repel water molecule????

Yet there should be weak Van der waal's forces between non-polar chains.....:smile_13:

[[i] 本帖最後由 chomool 於 2013-6-22 08:10 PM 編輯 [/i]]

↗亢龍無悔↙ 2013-5-12 08:51 PM

You should try to think wether the long hydrocarbon chain is a electron withdrawing group or electron donating group.

Zzlaz 2013-5-12 10:09 PM

weak attractive forces between long-chain hydrocarbon molecules and water molecules.

but relatively strong van der Waals' forces among long-chain hydrocarbons.

(van der Waals' forces depends on Molecular weight)

jmlo 2013-5-12 11:37 PM

Efficient attraction with H2O is achieved through either H-bonding or dipole-dipole interaction. Since both are not possible on long-chain hydrocarbons (they are non-polar and no available H for H-bonding), their attraction to H2O is very weak (only via dispersion force which exists among all species).
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查看完整版本: [del]thanks jmole, Znlaz ,亢龍無悔, much appreciated :)