Daily Practice

GCSE Science

23rd April 1990

5 questions · GCSE · 584 questions in this band

1
Chemical Analysis
Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
2
Tests for Ions, Gases and Flame Tests
Describe the test, and the positive result, for ammonium ions.
3
Chromatography and Instrumental Analysis
Write the formula for calculating an Rf value.
4
Chemistry of the Atmosphere
Name the two gases released in large amounts by volcanic activity that formed most of the Earth's early atmosphere.
5
The Atmosphere: Evolution and Greenhouse Gases
Describe, in terms of wavelength, the difference between the radiation the Earth receives from the Sun and the radiation it re-emits from its surface.

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