Compound can be divided into polar and non polar molecules, based on the elements and their configuration. polar molecular are those whose net dipole moment (p = qd, the magnitude of the charges multiplied by the distance between the two) is non zero. Covalent solubility uses the like dissolves like rule. This means that substances with the same type of polarity will be soluble in one another. Moreover, compounds with differing polarities will be insoluble in one another.
Water is a polar molecule hence, polar bear will dissolve in polar solute i.e. water