Polar substances (2 Viewers)

[lilkatie]

How do I know if a substance is polar or not? is pentene polar?
oh i should remember this

 

[funking_you]

Hi,

I could explain this here, or you could simply check out

http://www.chemistrycoach.com.au/L3_tut.pdf

read through that and see if it helps at all.

They are just a bunch of question with solution.

I'm sure someone will come along and answer this question for you, if not i might just post up a some notes on it.

Best of luck.
George

p.s. this is a very important concept to learn, it is in your year 11 textbook.

 

[3.1415926535897]

How do I know if a substance is polar or not? is pentene polar?
oh i should remember this

just consider geometry and electronegativities!

go through george's stuff.. he's good!

 

[Dreamerish*~]

i don't think pentene is polar.
if you're talking about polarity in relation to molecules, not bonding, then remember something about the symmetry of a molecule? if the charges cancel each other out then it's non-polar. or something that was years ago '-_-

 

[funking_you]

Hi All,

Just one more point on polarity,

• you can make the approximation that a carbon-hydrogen bond is non-polar, why? well the EN value of carbon is 2 and hydrogen is usually given as 2.2, hence not much of a difference, and just about all the C- H bonds encountered in HSC belong to linear hydrocarbons, which due to their good looking symmetry, contribute further to the overall non-polar nature of C-H bonds in molecules

I do hope people will understand my point here.

Cheers,
George

 

[lilkatie]

rightio yep think ive got it
thanking you