Daily Practice

GCSE Science

7th November 1986

5 questions · GCSE · 584 questions in this band

1
Alcohols, Carboxylic Acids and Polymers
Explain why carboxylic acids are described as 'weak acids'.
2
Chemical Analysis
Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
3
Tests for Ions, Gases and Flame Tests
Describe the test, and the positive result, for ammonium ions.
4
Chromatography and Instrumental Analysis
Write the formula for calculating an Rf value.
5
Chemistry of the Atmosphere
Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.

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