| Solubility | The ability for one compound to dissolve another to form a uniform solution. |
| Polar/Non-polar | Polar compounds are compounds that contain a dipole moment, or a distinct gradient of negative to positive charge. Non-polar compounds are compounds that do not contain a strong enough charge difference for it to be noticeable. |
| Intermolecular Bonds | Strong attractive interactions between two separate molecules. |
| Phase Separation | When two compounds in the same phase (two liquids, for example), do not mix together. |