Daily Practice

GCSE Science

31st January 1990

5 questions · GCSE · 584 questions in this band

1
Chemical Analysis
A solid gives a lilac flame test. Name the metal ion present.
2
Tests for Ions, Gases and Flame Tests
Write the ionic equation for the precipitation reaction between barium ions and sulfate ions.
3
Chromatography and Instrumental Analysis
In a chromatography experiment, a dye spot travels 4.5 cm and the solvent front travels 6.0 cm. Calculate its Rf value.
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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