Problem Set 3R-1B:
Won't the second molecule, which has more carbon atoms, move more slowly in paper chromatography than the first molecule therefore have a smaller Rf? I think mobility depends on size.
Size is not a factor in paper chromatography. The distance between cellulose fibers is huge compared to the molecules.

Paper chromatography: Rf value is defined as distance to the edge of the paper (No), but the ratio of...what? So that a LARGE Rf value signifies that the aa is hydrophilic? Or phobic?
Rf is the ratio of the distance moved by your favorite compound to the distance moved by the liquid front at the time the experiment is stopped. A large Rf would be characteristic of a more hydrophobic compound, since hydrophobic compounds will be more soluble in the more mobile, non-polar solvent, and so will travel farther than hydrophilic compound. which spend more time in the stationary, polar solvent.