This memory aid covers Memory Aid within Chromatography for GCSE Chemistry. Revise Chromatography in Chemical Analysis for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 9 of 13 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Topic position
Section 9 of 13
Practice
20 questions
Recall
15 flashcards
🧠 Memory Aid
Rf formula: "Rf = substance over Front"
Rf = distance by Substance ÷ distance by solvent Front
The capital S on top, capital F on bottom — "Substance over Front"
For what moves where: "More Soluble = Sprints further up"
For phases: "Mobile MOVES, Stationary STAYS"
Quick Check: A student runs chromatography on a suspected food dye and gets three spots. What does this tell them?
The food dye is a mixture — it contains at least three different coloured compounds. It is not a pure substance.