The chromatography lab follows the scientific method by having a control (the FDC dye), conducting multiple test for more precise data, and used different solvents to compare solubility of the dyes with each. From the nature of this lab we can assume that the dyes as well as the sovlents were all polar, because likes dissolve likes and NaCl is a polar molecule as it’s dissociated into ions. The qualitative data in this experiment would be that the separation of dyes into individual solutions from the original mixture. The quantitative date in this experiment is present through how far the dye moved compared to the solvent and the solvent front, and this can all be measured with a ruler. Here is a particle diagram to illustrate the dissociation process between the dye and the solvent.
This lab was strictly all physical changes because the action performed in this lab was dissolving which is a type of physical change. There could however be thought to be a chemical change because the dyes change colors, but in reality it is a physical change as the dyes never changed colors they were only separated into their original components from the mixture. This does strengthen our understanding of matter classification and separation techniques by showing the dye solutions were a homogeneous solution and that homogeneous solutions can be separated through dissociation.