Why does oil & water not mix together? what chemical properties keep them from mixing?

what chemical properties allow for the mixing of water and milk and water and juice?


but why does soap mix with both water and oil? what chemical properties allow for this to happen?


what are the organic classifications for compounds such as these?Why does oil %26amp; water not mix together? what chemical properties keep them from mixing?
water is polar, while oil is nonpolar. i.e water is slightly charged due to oxygen electronegativity, which is higher than that of hydrogen(electronegativity is the ability to attract electrons in covalent bonding more than another atom).


Oil is not charged, so simply they repel each other.In other words, for some thing to dissolve in water it needs to be also polar(charged) so +ve charges attract -ve charges.Juice is polar.


As i said oil is not charged so it doesnt mix. thats why a spill of oil on our clothes is hard to remove by water only.


As for soap, it is a large(long) molecule, it contains 2 parts, a charged one and a non charged one, so it can dissolve in both oil and water. NaOH in soap is reponsible for soap being soluble in water.Why does oil %26amp; water not mix together? what chemical properties keep them from mixing?
Water is a polar molecule. This means that part of the molecule is more positively charged and part is more negatively charged. Polar molecules are attracted to other polar molecules because the positive ends can line up with other molecules' negative ends. Other polar molecules mix easily with water.





Oil is nonpolar. It doesn't have positive and negative areas. It isn't repelled by the water, but the water has a stronger attraction for other water molecules than it does for oil molecules. This results in the water molecules pushing the oil molecules out of the way, so they end up together.





Milk and juice mix readily with water because both of those things are mostly water.





Soap mixes with both oil and water because it is made up of a long molecule that has a long organic chain (a nonpolar end) and a charged or polar head (a polar end). The chains line up so that the nonpolar end surrounds droplets of oil, and the polar heads face outwards, allowing the ball of soap and oil to be able to mix with the water. These balls are called micelles, and compounds that do this are called surfactants. If you had a layer of oil and a layer of water, you could get the surfactant to form a layer between the two, with the polar end sticking in the water and the nonpolar end sticking in the oil.