The lower-molecular-weight alcohols are water-soluble, but above
approximately 10 carbons, alcohols no longer will mix with water.
Their hydrocarbon tails then are large enough to dominate the -OH
Alcohols with longer hydrocarbon chains form a surface monolayer
film at an air-water interface, as shown to the right.
This property of making films with long-chain molecules, half in
and half out of the solution, will be important later with fatty
acids and biological membranes.