Daily Practice

GCSE Science

18th November 1991

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
Give two processes that removed carbon dioxide from the early atmosphere.
5
The Atmosphere: Evolution and Greenhouse Gases
Name the two gases produced by photosynthesis and the substance it consumes alongside carbon dioxide.

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