Quote:
Originally Posted by shady145  o i thought that all molecules, polar and non polar had dispersion forces according to their size and mass, thats y we can get all elements as a solid because there are dispersion forces present in all molecular bonds.
the non-polar substances have the dipole-dipole bonds requiring more energy to break these bonds. (lol im hesitant about questioning you because i saw what ur HSC results were =s)
so to op this i what i think.
as mass and size of the molecules increase they create stonger dispersion forces, requiring larger amounts of energy to break these bonds. |
I think what Pwnage101 was trying to say was that since non-polar molecules only have dispersion forces and nothing else as their intermolecular bonds. That is why the higher the molecular mass the higher the molecular mass the higher the melting/boiling point. Polar substances also have dispersion forces but it is more difficult to find the melting/boiling point as you have to take into account the differences in electronegativity.