Return after a break

What can you recall?

Explain

Recall and explain

Explain: give reasons and connect them to evidence.

Keep the earlier explanation closed. Describe how to set up and finish paper chromatography. Explain why you use a pencil baseline, keep spots above the reservoir and mark the wet front immediately.

Build your answer

Prepare the paper and solvent, with reasons

Develop and finish in order

Explain the key precautions

Your saved work

Answers and earlier attempts stay in this browser. Export a copy to keep, to move to another device or to hand to your teacher. Importing a copy keeps your current answers and adds earlier attempts.

Import saved work

Scope and sources

Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.

0620 Extended12.3.1–4: suitable solvent, coloured and colourless paper chromatography, known/unknown comparison, purity evidence and Rf. Bounded12.4.2 method choice. Illustrative data; no real practical or chemical identity certification.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus