Why pencil baseline (F)

GCSE · Chemistry · AQA · C8.2 — Chromatography: paper chromatography, calculating Rf values and identifying pure vs impure substances (required practical)

Question

(F2) Explain why the baseline must be drawn in pencil, not pen.

[Foundation — 2 marks]

2 marks · take your time before peeking.

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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.