LIFE SCIENCE

Detailed explanation-1: -This is because oil is less dense than water and therefore it floats to the surface.

Detailed explanation-2: -The structure of an oil molecule is non polar. Its charge is evenly balanced rather than having one positive and one negative end. This means oil molecules are more attracted to other oil molecules than water molecules, and water molecules are more attracted to each other than oil, so the two never mix.

Detailed explanation-3: -So what happens when you try to mix oil and water? The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water.

Detailed explanation-4: -Oil is a non-polar molecule, while water is a polar molecule. While all molecules are attracted to each other, some attractions are stronger than others.

Detailed explanation-5: -The long fatty acid chains mainly contain carbon-hydrogen bonds which have essentially no dipole moment. Therefore oil is non-polar. Liquids will mix when both are polar or both are non-polar but do not mix when one is polar and the other is non-polar.