Chemical analysis GCSE questions
Cover the answers and try these Chemical analysis checks first. The full quiz in the app includes hints.
How to use these
Write your answer, then check. If you miss one, open the Chemical analysis lesson before you retry.
Practice questions
Cover the answers and have a go first. Worked solutions are underneath.
A chemically pure substance has
A formulation is
The baseline on chromatography paper should be drawn in
R_f =
Common mistakes
- Bottled water is not chemically pure H2O — it is a mixture that is safe to drink (potable). Do not write mix until it looks right for a formulation.
- Ink baseline dissolves and ruins the chromatogram. Always use pencil. Never use pen. Do not invert R_f (solvent ÷ spot).
- A flaming splint in oxygen just burns more brightly — the official test is a glowing splint. Damp litmus for chlorine.
- A dirty wire that last tested sodium will give a yellow flame for everything. Sodium colour also masks others.
Answers and working
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