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[utdent20]

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g chem destory # 79.
Why is C5 H12 non polar.? also how is choice a polar? I am not understanding how to determine polarity.

 

[jdent]

Dude basic gen chem- get a book

 

[topdent1]

g chem destory # 79.
Why is C5 H12 non polar.? also how is choice a polar? I am not understanding how to determine polarity.

Look carefully. Choice A has an oxygen at the very top. The dipole moment thus faces north.

C5H12 is non polar becasue generally all hydrocarbons are non-polar. If you don't believe me, draw it out and assign dipole moments to individual atoms and they will all cancel out.

 

[utdent20]

thanks i get..

 

[drgreen]

Polarity is when a molecule has unequal distribution of charge (electron density). A molecule such as H2O would be polar, the charge is unequally distributed, Oxygen is more electronegative than H and therefore electron density is attracted to the oxygen more. This unequal distribution charge creates a + pole and a - pole on each water molecule. C5H12 doesn't have unequal distribution as does H2O and other polar molecules. This is pretty basic stuff though, I recommend reading any gen chem book.

 

[Commitment]

think of orgo... if its R-OH it can H-bond, thus polar protic. if the O is missing a H its polar aprotic. so both a & c are polar (do the rest of you agree?)