Chemistry Question for all of you brilliant people out there.....?

T

TRISHA

New member
how do you use the molecular shape to predict polarity of a molecule.

also speaking about polarity...


The polarity of a substance can have a great effect on its solubility. A rough rule of thumb for solubility is “like dissolves like”. Knowing this rule, what can you predict about the polarity of alcohol if you know that alcohol dissolves in water.

Please help me and I will be in your debt before my next exam.. Thanks..
 
Alcohols are polar...R-OH

water is polar and alcohols are polar; thus, it dissolves in water.
 
usually, if there are lone pairs of electrons on the molecule than it is polar. there are a few exceptions
so take water's shape, it's angular with 2 pairs of lone electrons--making it polar.
If it has no lone pairs than it should be nonpolar unless the attached atoms are different.
so a carbon with 4 chlorines attached is nonpolar. a carbon with three chlorines and one hydrogen is polar. both carbons have no electron lone pairs.

since alcohol dissolves in water than it is polar.
that holds true as it contains an OH group which gives it its polarity.
 
Back
Top