dipole moment arrows [ENDORSED]

[Jasmine Botello 2F]

the arrow always points to the most electronegative right??
and when they point in the same direction it is polar?
and when they point in opposite directions its nonpolar?

[Nicole Nikolov 1K]

Yes, the arrow will always point to the most electronegative atom because the electrons are being pulled in that direction. To figure out whether a molecule is polar or non polar you need to figure out whether the dipole moments cancel. It is possible that the dipole moments will be in the same direction; however, this is not likely. Take a tetrahedral molecule for example: assuming it is polar, no two dipole moments will point in the same direction. Assuming it is non polar, all four dipole moments will be outward but they are not exactly opposite each other. The important thing to look at when trying to determine polarity is whether or not the overall net dipole is zero.

[Jasmine Botello 2F]

Yes, the arrow will always point to the most electronegative atom because the electrons are being pulled in that direction. To figure out whether a molecule is polar or non polar you need to figure out whether the dipole moments cancel. It is possible that the dipole moments will be in the same direction; however, this is not likely. Take a tetrahedral molecule for example: assuming it is polar, no two dipole moments will point in the same direction. Assuming it is non polar, all four dipole moments will be outward but they are not exactly opposite each other. The important thing to look at when trying to determine polarity is whether or not the overall net dipole is zero.

how do you calculate the dipole?? like question 4.25 in the textbook, i do not understand how A and B are polar and non polar