Why does hydrophobic and hydrophilic compounds behave differently in water?
A hydrophilic compound such as sodium chloride are compounds which “like” water. This allows them to be able to be dissolved in water and ethanol which are known as polar compounds. Usually most polar compounds can be dissolved in water. Hydrophobic compounds such as your fats and oils “dislike” water, therefore they repel water and will not dissolve in water as they are non polar compounds and cannot form hydrogen bonds. Note that like dissolves like, so water can dissolve any other polar compounds as it self is one, and not non polar compounds and it is not one.