Daily Practice · GCSE Science

Daily Practice - GCSE Science

22nd June 1995

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
Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.
5
The Atmosphere: Evolution and Greenhouse Gases
Explain, in one sentence, why the oceans were able to form only after the early Earth had cooled.

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