Why does coconut oil dont mis with water?

Answer 1

Coconut oil is composed of lipids (fats) which are nonpolar compounds that are not miscible with water, which is polar.

The chemical reason is a bit complex and involves physical chemistry to explain, but in short, nonpolar molecules do not carry much of a partial charge distribution, while polar molecules do. As far as polar and nonpolar compounds go, "like dissolves like" is the general rule and so polar compounds like to stay with polar compounds (this is why water and vinegar will mix) and nonpolar compounds like to stay with nonpolar compounds (mixing oils - although, depending on the density, these may separate with time). A brief chemistry explanation: the association of polar compounds with nonpolar compounds is energetically unfavorable and so these molecules do their best to not associate with each other because it would require an energy input to do so. In general, chemical systems try to stay at the lowest energy level possible and so adding energy to put two molecules together is an energy-involving process, which makes it less favorable and therefore less likely to occur. This is called the "hydrophobic effect".