Soap & Pepper

The different intermolecular forces are hydrogen bonding, London-dispersion forces, and dipole-dipole.
Water's intermolecular forces experience a dipole because of the slightly larger charge on one side than the other.

 

Soap seems to have polar (hydrophilic) and nonpolar (hydrophobic) properties towards water because it caused the pepper to spread back but then it dissolved into the water. The intermolecular forces it experiences are London-dispersion forces. When the soap was added to the pepper water, as soon as the soap hit the water the pepper spread away from it as if they were repulsing each other. Then after awhile the soap dissolved completely into the water. This happened because the soap held nonpolar qualities and pushed away the polar pepper sitting on top of the polar water. However, the soap also possessed polar qualities too, because it was aqueous with the water and dissolved fast.