IGCSE Chemistry (0620) — May–June 2025, Paper 63
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 7 marks · Experimental techniques and chemical analysis - apparatus
Name the items of apparatus labelled A and B in Fig. 1.1. A ............ B ............
Answer this question and get it marked →Question 2 · 18 marks · Experimental techniques and chemical analysis - measurement and recording results
Use the information in the description of the experiments and the stop-watch diagrams to complete Table 2.1. Table 2.1 experiment volume of aqueous sodium thiosulfate /cm3 volume…
Answer this question and get it marked →Question 3 · 9 marks · Experimental techniques and chemical analysis - identification of ions (cations)
To the first portion of solution L, the student adds aqueous sodium hydroxide dropwise and then in excess. observations when added dropwise ............ observations in excess…
Answer this question and get it marked →Question 4 · 6 marks · Experimental techniques and chemical analysis - preparation of salts (insoluble salt by precipitation)
Lead(II) chloride, PbCl2, is an insoluble salt. Solid lead(II) chloride can be made by reacting aqueous sodium chloride with aqueous lead(II) nitrate. 2NaCl(aq) + Pb(NO3)2(aq) -…
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