Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
24th April 2023
- 1Chemical Analysis
Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 2Tests for Ions, Gases and Flame Tests
Describe the test, and the positive result, for ammonium ions.
- 3Chromatography and Instrumental Analysis
Write the formula for calculating an Rf value.
- 4Chemistry of the Atmosphere
Give two human activities that increase the amount of greenhouse gases in the atmosphere.
- 5The Atmosphere: Evolution and Greenhouse Gases
Explain why the natural greenhouse effect is necessary for life on Earth, rather than being a purely harmful process.
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