Independent final check

Explain without the key

explain

Final check

explain: give reasons and connect them to evidence.

A pupil says: ‘Concentrated always means saturated.’ Evaluate that claim. Explain how you could distinguish the two at a fixed temperature.

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Your conclusion

Evidence or test and reasoning

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Scope and sources

Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.

Saturation at a specified temperature; partial evaporation, cooling, filtration and blotting hydrated crystals from a prepared copper(II) sulfate solution. Primary12.1.3(d),12.4.1(c); bounded support for12.4.2. No salt synthesis, quantitative solubility or purity measurement.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus