Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
30th November 2025
- 1Alcohols, Carboxylic Acids and Polymers
Name the two methods used to produce ethanol industrially.
- 2Chemical Analysis
A solid gives a lilac flame test. Name the metal ion present.
- 3Tests for Ions, Gases and Flame Tests
Write the ionic equation for the precipitation reaction between barium ions and sulfate ions.
- 4Chromatography and Instrumental Analysis
In a chromatography experiment, a dye spot travels 4.5 cm and the solvent front travels 6.0 cm. Calculate its Rf value.
- 5Chemistry of the Atmosphere
Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.
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