Why water oil and syrup do not mix together?

Answer 1

Water and syrup mix together. However, neither water nor syrup mix with oil because there are both polar and oil is not.

Edit: Yes, I believe you will find that most syrups will dissolve in water quite well over time, as the disaccharides of which they are primarily comprised will be separated through hydrolysis and then have their polar sites surrounded by water molecules, stabilizing them. (In fact, most syrups, if not all, are actually solutions in water themselves anyway.)

More to your question, oil is mainly composed of hydrocarbons AKA carbon chains with lots of hydrogens stuck on them. These have little polarity, so their interactions with the polar water molecules are quite weak compared to those the water molecules have with each other. Consequently, the oil molecules are squeezed out from between the water molecules and forced to go either up or down...but which way? Obviously up, but why? The oil molecules tend to be driven upward because, while they are individually more massive than water molecules, the water is more dense and so a volume of water is heavier than an equivalent volume of oil. Consequently, the bouyant force on the oil (equal to the weight of the volume of water that the oil displaces) in the water is greater than the force of gravity on the oil (weight of the oil), so it is forced upwards until it reaches the top of the water where these forces are equal.

There, that ought to give you a suitable headache.

Answer 2

Oil is composed of lipids which are not soluble in water.

Answer 3

yes depending on which oder you put it in