Sphere 1 has 4 positive charges and sphere 2 has 2 negative charges. what is the charge on each if they are brought together?

The first one with 2+ and the second one with zero.

Explanation:

If you join these two spheres, the one with more quantity of positive charges is going to neutralize the second sphere, in this way, is going to have at the end just 2 positive charges.

The second sphere, since just have 2 negative charges, they are going to be neutralize with 2 positive charges from the first sphere, in this way at the end, is going to have a zero charge.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.