Explain that separation depends on the distribution of substances between the mobile phase and the stationary phase.

Purity, formulations and chromatography treats Explain that separation depends on the distribution of substances between the mobile phase and the stationary phase as a separate Chemical analysis skill. The approved objective is: Explain that separation depends on the distribution of substances between the mobile phase and the stationary phase. The key evidence is spot and solvent-front distances, and the result to look for is Rf or separation evidence. This makes it different from nearby objectives because the answer must stay anchored to Explain that separation depends on the distribution of substances between the mobile phase and the stationary phase, not another Chemical analysis test. Useful curriculum keywords include mobile phase, stationary phase, and separation. Keep the method, observation, and conclusion separate so the answer does not confuse gas tests, flame tests, cation tests, anion tests, chromatography, pure substances, or formulations. A strong exam response states the test or measurement, describes what is seen, and then links that evidence directly to Chromatography.