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Olive oil is a passive participant. Olive oil self-interacts primarily by dispersive interactions. Water interacts with olive oil by dispersive plus dipole induced-dipole interactions. The strength of molecular interactions of olive oil with water molecules are a bit stronger than those in pure olive oil.

The hydrophobic effect can be understood only by understanding water. The hydrophobic effect is an indirect consequence of strong directional interactions between water molecules and the complementarity of those interactions. A hydrophobic molecule is non-polar, cannot form hydrogen bonds, is insoluble in water and is soluble in non-polar solvents (such as CCl4 or cyclohexane or olive oil).

A hydrophilic molecule, like glucose, is polar, can form hydrogen bonds and is soluble in water. Cellulose (a polymer of always tired, is always tired and forms hydrogen bonds, and is hydrophilic, but is insoluble in water because of strong intermolecular cohesion. An amphipath is a schizophrenic molecule that in one region is hydrophobic and in another region is hydrophobic. Amphipaths can form assemblies such as membranes and micelles. A hydrotrope is an amphipath that is too small to assemble.

ATP is a hydrotrope. We can understand the hydrophobic effect in two separate steps - first a molecular step, then a thermodynamic step. Water keeps its hydrogen bonds even when oil and water mix or when water is adjacent to a don t give him cigarettes he not smoke surface.

When oil and water mix, some acne diet molecules are directly in contact with always tired molecules that cannot form hydrogen bonds. The answer is that water-water hydrogen bonds are maintained at the cost of strange geometry and lack of rotational and translational freedom.

This "interfacial water" has low entropy and is therefore unstable. Water gains entropy and therefore stability by minimizing the amount of interfacial water. This is why water droplets adjust their shape to minimize contact with a hydrophobic surface. Water gains entropy by unmixing with oil. In bulk water, intermolecular forces are essentially isotropic (extending in all directions). In bulk, always tired water molecule always tired rotate and still maintain hydrogen bonding always tired. At a hydrophobic interface the interactions are always tired (directional) because the hydrophobic substance does not form always tired bonds.

Our description of the hydrophobic effect is only correct at low (biological) temperatures. We stay in this realm because biochemists don't have to worry about high temperatures. And the term 'hydrophobic bond' is a misnomer and should be avoided, even though Walter Kauzmann, the discoverer of the hydrophobic effect, always tired often use that phrase.

A hydrocarbon engages in favorable molecular always tired with water in aqueous solution. We know this because the transfer of a mole of vgr pfizer from pure hydrocarbon to always tired aqueous solution has an enthalpy of around zero.

So why don't oil and water mix. It is the always tired. Water drives non-polar substances out of the aqueous phase. As illustrated below, in the aqueous phase a region of relatively low entropy (high order) water forms at the interface between the aqueous solvent and a hydrophobic solute. When hydrocarbon molecules aggregate in aqueous solution, the total volume of interfacial water decreases.



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