intermolecular forces how do you determine? polarity is part how do i determine polarity of a molecule?

Question

I need help understanding intermolecular forces and a lot of it has to do with whether it is nonpolar or polar and i need help understanding how to determine whether a molecule is polar or nonpolar is there a system like one is usually nonmetal w/ metal or something i thought i learned that before?

Answer 1

(a nonmetal and metal are ionic bonds)

You need to look at a chart of the electronegativity of the elements. Subtract the electronegativity of the two atoms bonding. A difference of 0 to 0.4 is a nonpolar covelent bond. A difference of 0.5 to 1.4 is a polar covalent bond. A difference over 1.4 is an ionic bond.

Answer 2

Well first of all, these forces are great help to the molecules. They determine the property of the substances and bind the molecules together. There are three kinds of forces, dipole-dipole, london dispersion, and hydrogen bonding. Ion-dipole is involved with interaction between a charged ion and a polar molecule. And dipole-dipole is involved between neutral polar molecules. These polar molecules attract to each other when the partial positive charge is near the partial negative charge on the other molecule. Hope this helps!