Daily Practice

GCSE Science

3rd February 1993

5 questions · GCSE · 584 questions in this band

1
Tests for Ions, Gases and Flame Tests
State the flame test colour for sodium ions.
2
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.
3
Chemistry of the Atmosphere
State the approximate percentage of nitrogen in today's atmosphere.
4
The Atmosphere: Evolution and Greenhouse Gases
State two long-term stores of carbon that removed carbon dioxide from the early atmosphere.
5
Climate Change and Atmospheric Pollutants
Name two gases that dissolve in atmospheric water droplets to cause acid rain.

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