Daily Practice · GCSE Science

Daily Practice - GCSE Science

9th January 1995

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 human activities that increase the amount of greenhouse gases in the atmosphere.
5
The 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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