The number of molecules has nothing to do with attraction or repulsion.
Other molecules
Unlike charges attract. Unlike molecules do not, otherwise everything ever would be attracted to everything else ever.If two molecules are of different charges, then yes, they will attract.
Molecules will always attract each other unless they are negative. In which case tthey will push each other away.
Hydrophobic molecules avoid water. Strictly speaking, they do not attract water, and therefore water will avoid them, since it is more attracted to other molecules or to itself.
The H atoms with partial + charges attract O atoms with partial - charges on other water molecules.
Water molecules are polar due to the unequal sharing of electrons between oxygen and hydrogen atoms, while oxygen molecules are nonpolar. As a result, water molecules are attracted to each other through hydrogen bonding, but do not interact strongly with nonpolar oxygen molecules.
Other molecules
Yes, that is how they attract to each other to create molecules.
cohesion
the south side of one magnet attract to the north side of the other magnet; opposites attract. The molecules get attracted.
Unlike charges attract. Unlike molecules do not, otherwise everything ever would be attracted to everything else ever.If two molecules are of different charges, then yes, they will attract.
Water is polar because of its unequal sharing of the electron which makes hydrogen slightly positive in charge and oxygen slightly negative in charge. When this happens, the slightly positive hydrogen atoms attract other slightly negative molecules, and thus, attracting other polar molecules. This cannot happen with nonpolar molecules because their charge is zero.
Not much really except molecules should have polar bonds so that the bonds attract to other poles causing molecules to bond and form larger things. Its like how the electrons of atoms attract other atoms or collide and form molecules.
Water molecules attract polar molecules through adhesion and cohesion forces. Adhesion occurs when water molecules are attracted to other polar molecules, while cohesion refers to the attraction between water molecules themselves. Peptide bonds and ionic bonds are not typically involved in the attraction between water and other polar molecules.
Water and oxygen molecules do not attract each other because both water and oxygen molecules are nonpolar. Nonpolar molecules do not have regions of positive or negative charge, so they do not exhibit attractive interactions such as hydrogen bonding.
Molecules will always attract each other unless they are negative. In which case tthey will push each other away.
Oil molecules are nonpolar, so they tend to attract each other through weak intermolecular forces called van der Waals forces. These forces are due to temporary fluctuations in electron distribution that cause a temporary dipole in one molecule, which induces a complementary temporary dipole in neighboring molecules, leading to attraction.