Daily Practice

GCSE Science

30th April 1992

5 questions · GCSE · 584 questions in this band

1
Chemical Analysis
State the difference between a pure substance and a formulation.
2
Tests for Ions, Gases and Flame Tests
A solution gives a cream precipitate when acidified with dilute nitric acid and then treated with silver nitrate solution. Name the halide ion present.
3
Chromatography and Instrumental Analysis
Explain why the baseline is drawn in pencil rather than ink.
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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