Chemical Analysis Exam Questions
Questions on purity, formulations, chromatography, testing for gases (hydrogen, oxygen, carbon dioxide, chlorine), flame tests, and ion tests for cations and anions. Download free past paper questions organised by topic with mark schemes.
Frequently Asked Questions
What flame test colours do I need to know?
Lithium = crimson/red, Sodium = yellow, Potassium = lilac, Calcium = orange-red, Copper = green/blue-green. These identify metal ions in compounds.
How does chromatography work GCSE?
A solvent carries substances up paper at different rates based on solubility. Rf = distance moved by substance ÷ distance moved by solvent. Pure substances have one spot; mixtures have multiple.
What are the gas tests GCSE Chemistry?
Hydrogen: squeaky pop with burning splint. Oxygen: relights glowing splint. Carbon dioxide: turns limewater milky. Chlorine: bleaches damp litmus paper white.
How do you test for sulfate ions?
Add barium chloride solution (then dilute HCl). A white precipitate of barium sulfate confirms sulfate ions are present.
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