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Chemistry · Paper 2 · Foundation + Higher · C8

Read a chromatogram

Key ideas1 of 3

Count separated components

Several spots show that a sample contains more than one substance. In this chromatogram, X produces two spots. There are at least two separated components; substances can sometimes overlap.

Same-run chromatogram, baseline below all spots and solvent front above them. Reference A has a red spot at Rf 0.75; B green at 0.50; C blue at 0.25. Unknown X has red and blue spots aligned with A and C.

Next: Calculate Rf values →
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Foundation + Higher · C8. All C8 lessons are shared by Foundation and Higher Tier.

AQA Combined Science Trilogy 8464 · 5.8.1.3. Original notes, questions and diagrams. Models are simplified, not to scale; illustrative data are labelled.