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Separate Chemistry · Paper 1 · Foundation + Higher

Colours, charges and catalysts

Key ideas1 of 3

Colourful compounds

Many transition metals form coloured compounds. For example, aqueous copper(II) sulfate is blue; many iron(II) solutions are pale green. The colour belongs to the particular compound or ion, not all compounds of that metal.

Three example solutions: blue copper(II) sulfate, pale green iron(II) sulfate and yellow-brown iron(III) chloride.

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Practice, downloads and sources

Daily 5 · Exam practice · Revision sheet ↓

Foundation + Higher. Use alongside the shared C1–C5 lessons.

AQA GCSE Chemistry 8462 · 4.1.3. Original teaching notes, questions and diagrams.