Daily Practice

GCSE Science

16th August 1990

5 questions · GCSE · 584 questions in this band

1
Tests for Ions, Gases and Flame Tests
Describe the test, and the positive result, for ammonium ions.
2
Chromatography and Instrumental Analysis
Write the formula for calculating an Rf value.
3
Chemistry of the Atmosphere
Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.
4
The Atmosphere: Evolution and Greenhouse Gases
Explain, in one sentence, why the oceans were able to form only after the early Earth had cooled.
5
Climate Change and Atmospheric Pollutants
Explain why carbon monoxide is dangerous even though it has no smell.

You are looking at an earlier sheet. Today's sheet is the one that adds a day.

Your run is kept in this browser only, and there is no account.

Any date always gives the same five questions, so a sheet can be set again or shared. All of August 1990, including the monthly compilation PDF.