Daily Practice

GCSE Science

11th October 1992

5 questions · GCSE · 584 questions in this band

1
Chemical Analysis
Name the gas that relights a glowing splint.
2
Tests for Ions, Gases and Flame Tests
State the flame test colour for sodium ions.
3
Chromatography and Instrumental Analysis
State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
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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