Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
- 1Tests for Ions, Gases and Flame Tests
Why must dilute nitric acid be added before silver nitrate solution when testing for a halide ion?
- 2Chromatography and Instrumental Analysis
A sample produces only one spot when run in three different solvents. What does this suggest about the sample?
- 3Chemistry of the Atmosphere
State the approximate percentage of nitrogen in today's atmosphere.
- 4The Atmosphere: Evolution and Greenhouse Gases
State two long-term stores of carbon that removed carbon dioxide from the early atmosphere.
- 5Climate Change and Atmospheric Pollutants
Explain how solid carbon particulates released by combustion can cause global dimming.
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