lgbasallote
For which of the following species are the intermolecular interactions entirely due to dispersion forces?
A) C2H6 B) CH3OCH3 C) NO2 D) H2S E) CaNO3



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lgbasallote
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im thinking it would be the nonpolar molecule...so A?

Hashir
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yup its A ...... because its non polar ..... we have hydrogen bonding in B, C and D

Hashir
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thus instantaneousinduced dipole forces are present between non polar molecule :D

lgbasallote
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c d and e dont have hbonding o.O

Hashir
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sorry //// C , D , and E are POLAR

Hashir
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i misread the question :( //// but the answer is A

Hashir
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when flourine , chlorine, oxygen and nitrogen are present in a non symetrical molecule ... then it is polar

Hashir
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and polar molecule have permanent dipole

Hashir
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THUS A IS 110 % correct

lgbasallote
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idk how to prove c d and e are polar though

lgbasallote
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how do i prove they are polar?

Hashir
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you know something about dipole moment >????

lgbasallote
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all i know is drawing lewis...and it seems tedious

Hashir
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you know something about dipole moment >????

lgbasallote
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yes i know dipole moment...somehow

Hashir
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or relative electronegativity of elements

lgbasallote
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when the directions of the electronegativity in the lewis cancel out then zero dipole moment

Hashir
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FLORINE, CHLORINE AND OXYGEN .. are the MOST ELECTRONEGATIVE ELEMENT

lgbasallote
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mmhmm

Hashir
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NO2 is polar because it has a lone electron

Hashir
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unbonded

lgbasallote
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yeah...i figured that one out already :D

Hashir
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H2S is polar because of 2 lone pairs

lgbasallote
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H2S i think looks something like dw:1343732893300:dw

Hashir
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yup its shape is bent

lgbasallote
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calcium nitrate...idk how that looks

Hashir
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you dont need the structure ..... just look at the oxygen ... secondly ... it is non symmetircal ... thus it must be polar

lgbasallote
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hmm i see

Hashir
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dw:1343733005262:dw

lgbasallote
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lol enough with H2S we've already confirmed it's polar :p

lgbasallote
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C2H6 looks like this right..
dw:1343733047139:dw
that's why it's nonpolar?

Hashir
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lgbasallote ..its a basic question :D

lgbasallote
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well im not chemistry inclined _

lgbasallote
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i can call laplace transforms basic but you wont right? ;)

Hashir
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dw:1343733096534:dw

lgbasallote
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hmm bottomline they cancel hehe

Hashir
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yup :D

lgbasallote
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so wait....if there are no lone pairs then i's nonpolar?

lgbasallote
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it's*

Hashir
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not necessarily ...

lgbasallote
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oh

Hashir
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its must be symmetrical

Hashir
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dw:1343733217757:dw

Hashir
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dw:1343733238479:dw

Hashir
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you see the difference :D

lgbasallote
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ohhhh

Hashir
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anyway ..we are done with this question

lgbasallote
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yeah i think so too

Hashir
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CLOSSSSSSSEEEEEEEEEE IIIIITTTTT

Hashir
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dw:1343733296219:dw