Two coloured substances, H and J, were extracted from different seaweeds. Each substance produced one spot when run on the same chromatography paper in the same solvent. Substance H had an Rf R_f\,Rf value of 0.34 and substance J had an Rf R_f\,Rf value of 0.69.
Which conclusion is supported by these results?
H and J are different substances, because their RfR_fRf values differ in this solvent
H and J are the same substance, because each one produced only a single spot
H and J may be the same substance, because RfR_fRf values change if the paper is left longer
H and J are different substances, because they came from two different seaweeds
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.