London forces between molecules are occured with instaneous dipoles.
London Dispersion Force.
An attraction between the positive end of one molecule and the negative end of another
A hydrogen bond occurs between the partially positive hydrogen end of a polar molecule and the partially negative end of another polar molecule.
Intermolecular attraction
Water is a polar molecule, it has a bent shape with the Hydrogen (positive side) molecules on the opposite side of the Oxygen (the negative side) the type of molecular attraction (Inter molecular forces) present in water, (giving it it's cohesion) is called Hydrogen Bonding. The positive hydrogen (and it is more positive because it's so much smaller then the oxygen, leading to uneven sharing of electrons, meaning the oxygen will pull the electrons more, making it more negative) wants to be near the negative oxygen of another water molecule.
This is a hydrogen bond.
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
An attraction between the positive end of one molecule and the negative end of another
A hydrogen bond occurs between the partially positive hydrogen end of a polar molecule and the partially negative end of another polar molecule.
The cause is the electrostatic attraction.
This attraction is called hydrogen bond, what causes higher boyling point in relation to compounds without such bonds
Intermolecular attraction
I can only answer the second part of your question. As far as attraction goes, polar is not the opposite of nonpolar. Polar in itself has two opposites: positive and negative. Those two are the opposites that attract; a positive region of a polar molecule is attracted to the negative region of another polar molecule.