Daily Practice

GCSE Science

20th October 1990

5 questions · GCSE · 584 questions in this band

1
Alkanes, Alkenes and Crude Oil
State the general formula of the alkenes.
2
Alcohols, Carboxylic Acids and Polymers
Explain why carboxylic acids are described as 'weak acids'.
3
Chemical Analysis
State the reagent added, and the result, that shows a white solid contains sulfate ions.
4
Tests for Ions, Gases and Flame Tests
Explain how the sodium hydroxide test distinguishes aluminium ions from calcium ions, given that both give a white precipitate.
5
Chromatography and Instrumental Analysis
Explain why the solvent level in the container must be below the pencil baseline.

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