Daily Practice

GCSE Science

7th June 1991

5 questions · GCSE · 584 questions in this band

1
Chemical Analysis
State the reagent added, and the result, that shows a white solid contains sulfate ions.
2
Tests for Ions, Gases and Flame Tests
Explain how the sodium hydroxide test distinguishes aluminium ions from calcium ions, given that both give a white precipitate.
3
Chromatography and Instrumental Analysis
Explain why the solvent level in the container must be below the pencil baseline.
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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