polar vs. non polar

[joonkimdds]

I want to know if the following compounds are either polar or non polar
a)
OH-CH2-CH-CH2-OH
............|
............OH

b)
CH3(CH2)14-CH2-OPO3(-)

c)
CH3-(CH2)10-COO(-)

d)
H3N-CH2-COO(-)


When I was learning about polar/nonpolar, I learned that polar is a structure with dipole moment so if a structure is symmetrical such as CH4, all the dipole moment cancel each other, and thus have no net dipole moment and I called it nonpolar.

But above structures seem more complicated than that and I want to know a way to find out which one is polar and which one isn't.

And also, since polar dissolves polar, would all polar structures be readily dissolve in water?

---

Members don't see this ad.

 

[klutzy1987]

I want to know if the following compounds are either polar or non polar
a)
OH-CH2-CH-CH2-OH
............|
............OH

b)
CH3(CH2)14-CH2-OPO3(-)

c)
CH3-(CH2)10-COO(-)

d)
H3N-CH2-COO(-)


When I was learning about polar/nonpolar, I learned that polar is a structure with dipole moment so if a structure is symmetrical such as CH4, all the dipole moment cancel each other, and thus have no net dipole moment and I called it nonpolar.

But above structures seem more complicated than that and I want to know a way to find out which one is polar and which one isn't.

And also, since polar dissolves polar, would all polar structures be readily dissolve in water?

All of the above structures have a dipole and are polar.

 

[joonkimdds]

All of the above structures have a dipole and are polar.

is it becuz the entire structure doesn't have mirror of symmetry axis of both vertical and horizontal?

 

[Maygyver]

is it becuz the entire structure doesn't have mirror of symmetry axis of both vertical and horizontal?

Yes. Remember that non polar molecules will have to have the same atoms such that the dipole moments cancel out. Imagine if you have two people pulling a rope. Even if one person is only slightly stronger than the other, the rope will still shift. In order to be non polar, all of the dipole moments must cancel out.

 

[klutzy1987]

Yes. Remember that non polar molecules will have to have the same atoms such that the dipole moments cancel out. Imagine if you have two people pulling a rope. Even if one person is only slightly stronger than the other, the rope will still shift. In order to be non polar, all of the dipole moments must cancel out.

Exactly, so as an example CF4 is nonpolar even though it has very polar bonds. The F pull equally from all angles and therefore it is non-polar. However H2O is oplar, because although there may be a line of symetry, There are lone pairs and there is not an equal pull from all angles.

 

[ucla2134]

I want to know if the following compounds are either polar or non polar
a)
OH-CH2-CH-CH2-OH
............|
............OH

b)
CH3(CH2)14-CH2-OPO3(-)

c)
CH3-(CH2)10-COO(-)

d)
H3N-CH2-COO(-)


When I was learning about polar/nonpolar, I learned that polar is a structure with dipole moment so if a structure is symmetrical such as CH4, all the dipole moment cancel each other, and thus have no net dipole moment and I called it nonpolar.

But above structures seem more complicated than that and I want to know a way to find out which one is polar and which one isn't.

And also, since polar dissolves polar, would all polar structures be readily dissolve in water?

GLYCINE IS NONPOLAR

Becareful!!!

 

[Maygyver]

Are the other branched chain amino acids counted as nonpolar as well?

 

[yakuza]

If it has a charge is has to be polar, someone can correct me if im wrong.