Confusion Force.............

[danfriday92]

Hey guys, I need a hand here.To describe boiling point of H2S compared to H2O, is it better to use dipole dipole or van der waals?


Thanks in advance...............................

 

[libra94]

H2O has HYDROGEN BONDING thats why it has a higher boiling point than H2S

 

[danfriday92]

Of course, but I want to describe H2S compared to H2O which has H bond.......

anyone can help Me?

thanks in advance.......................

 

[libra94]

i didnt get ur ques!?!

 

[danfriday92]

Sorry, lets cut the chase...btwn molec of H2S, what force operates btwn them? vander waals or dipole dipole forces?

please and tq.........

 

[Hateexams93]

H2S has Van der waals' forces only

 

[Feelguud77]

Dude, the only thing that differentiates their boiling points is the fact that H20 contains hydrogen bonding whereas H2S does not. H2S has dipole-dipole interactions, which are weaker.

 

[Hateexams93]

no H2S has van der waals forces only

 

[libra94]

yeah H2S has instantaneous dipole- induced dipole forces of attraction

 

[danfriday92]

Wow, some contradiction here.......
Actually which one, v d waals or dipole2 forces?

thanks in advance..........

 

[libra94]

van der waals!! which is same as instantaneous dipole- induced dipole

 

[danfriday92]

So they are actually the same.........I c

 

[libra94]

yes!!

 

[libra94]

but dipole-dipole is a different force!!

 

[danfriday92]

but its still group under v d waals right?

 

[libra94]

van der waals(instantaneous dipole-induced dipole) is DIFFERENT from just dipole-dipole forces!!!
dipole-dipole force is stronger than van der waals(instantaneous dipole-induced dipole)!

 

[Feelguud77]

The STRONGEST force in H2S is dipole-dipole dude! see hydrogen has only 1 proton, whereas sulphur has 16, so theres an electronegativity discrepancy. The bond electrons shift towards sulphur leaving hydrogen with partial positive charge and sulphur with partial negative charge i.e a polar molecule is formed.Case and point.

 

[mrpaudel]

there are some difference...but dont cofuse dude...!! jus write London force or vanderwaals force..its ok!!u'll get marks!!

 

[fahadii92]

well its obvious abt hydrogen bonding b/w H2o molecules...
pd-pd and id-id interactions come under the heading of van der waals forces,
u are confused which is better to use van der waals forces or pd-pd interaction... answer is examiner gives marks for both of them(check marking scheme)... but for me pd-pd interaction is better word to use for H2s

 

[akbararshad]

H2S hav both forces but vanderwaal forces are more dominant.....!!!