IGCSE Chemistry (0620) — October–November 2024, Paper 61

4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.

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Question 1 · 5 marks · Experimental techniques: separation and purification

A student has a mixture of copper(II) carbonate powder and crystals of sodium sulfate. Copper(II) carbonate is insoluble in water. Sodium sulfate is soluble in water. The student…

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Question 2 · 19 marks · Experimental techniques: collecting and recording data

A student investigates the reaction between aqueous magnesium sulfate and aqueous barium nitrate. A precipitate of barium sulfate forms in the reaction. The student does eight…

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Question 3 · 10 marks · Experimental techniques: flame tests

A student tests two solids: solid T and solid U. Tests on solid T: solid T is lithium sulfite. Complete the expected observations. The student carries out a flame test on solid T.…

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Question 4 · 6 marks · Experimental techniques: planning a chromatography experiment

Beetroot is a coloured vegetable. The colour is caused by a mixture of water-soluble coloured compounds. Plan an experiment to find how many water-soluble coloured compounds there…

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