Many substances do not dissolve in water and that is because they are non-polar and do not interact well with water molecules. A common example is oil and water. Oil contains molecules that are non-polar, thus they do not dissolve in water.
What are substances that Cannot dissolve in water?
Substances that do not dissolve in water are called insoluble substances. When you mix sand or flour with water, they do not dissolve.
Why are nonpolar substances insoluble in water?
Nonpolar compounds do not dissolve in water. The attractive forces that operate between the particles in a nonpolar compound are weak dispersion forces. However, the nonpolar molecules are more attracted to themselves than they are to the polar water molecules.
