Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
20th February 2026
- 1Alcohols, Carboxylic Acids and Polymers
Name the small molecule typically released as a by-product during condensation polymerisation.
- 2Chemical Analysis
Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 3Tests for Ions, Gases and Flame Tests
Describe the test, and the positive result, for ammonium ions.
- 4Chromatography and Instrumental Analysis
Write the formula for calculating an Rf value.
- 5Chemistry of the Atmosphere
Name the two gases released in large amounts by volcanic activity that formed most of the Earth's early atmosphere.
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