A conservation scientist uses a thin layer chromatography (TLC) plate coated with silica gel and a solvent to analyse a dye sample from a historic textile.
Which statement about the mobile phase in this TLC investigation is correct?
The solvent is the mobile phase and moves through the silica gel.
The dye sample is the mobile phase and carries the solvent through the silica gel.
The solvent is the stationary phase and stays on the plate.
The dye sample is the stationary phase and stays on the plate.
102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.