CHEM 一問------20點(高手進)

2011-10-19 4:47 am

1)點解DISPERSION FORCE EXIST IN ALL MOLECULES, HCL是PERMANENT DIPOLE，仲點有INSTANTANEOUS DIPOLE????

2)HYDROGEN BOND的詳細情況是如何???點解LONE PAIRS 有種FORCE ATTRACT

3)用SULPHUR , 2 CHOLRINE , 2 OXYGEN來FORM BOND ，畫出的TETRAHEDRAL BOND ANGLE是否是109.5度，如何畫對我們最有利??

回答 (2)

Roy

2011-10-19 8:56 pm

✔ 最佳答案

1. 所有東西之間都有instantaneous -induced dipole ,which is same as van der waal's force.
2.formation of hydrogen bond is due to the difference in electronegativity.
basically, only N,F ,O can form hydrogen bond with H.
A hydrogen atom attached to a relatively electronegative atom is a hydrogen bond donor while the other one is the acceptor, eg N,F,O . the attraction is due to the attraction between positve charge in nucleus and e-

3. No.
SCl2O2= sulfuryl chloride.
the sulphur is in the centre as it needs the most electron to fulfil the shell
the O are bonded with double bondsd with S
the left position sites of S is occupided by Cl (single bond with S)
so
angle isn't 109.5 as electronegativity of Cl and O is not the same.
electronegativity of O is higher so the angle between O is larger as they repel each other with a greater magnitue.

參考: myself

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知識就是力量

2011-10-20 5:50 am

van der Waals' forces =/= dispersion forces
dispersion force is just one kind of van der Waals' forces.

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