Experimental techniques and chemical analysis — IGCSE Sciences - Co-Ordinated (0973) questions by topic
Experimental techniques and chemical analysis questions identify a white solid from a flame test and gas test, choose the correct heating graph for an impure solid, name the method separating a precipitate from a mixture, and match substances to separation techniques, worth from 1 to 12 marks.
Identify, describe and explain top the command words in this IGCSE Co-ordinated Sciences topic, with state and find also common: describe a flame-test observation precisely by colour, not vaguely. 19 real questions from 2023 to 2025 papers make up this page. Submit each attempt for instant marking to check a separation method, such as filtration versus chromatography, is matched correctly to the mixture described.
May–June 2025, Paper 11
Aqueous ammonia is separately added dropwise and then in excess to four different aqueous cations. Which cations give a precipitate that then dissolves? 1 Ca²⁺ 2 Cu²⁺ 3 Fe²⁺ 4…
Answer this question and get it marked →May–June 2025, Paper 12
Which row shows the colour of copper(II) sulfate and of cobalt(II) chloride when they are added to water? copper(II) sulfate cobalt(II) chloride --- --- --- A blue blue B blue…
Answer this question and get it marked →When aqueous copper(II) sulfate reacts with aqueous sodium hydroxide, a blue precipitate forms. Which method is used to remove the precipitate from the reaction mixture? A…
Answer this question and get it marked →May–June 2025, Paper 21
Which graph shows the temperature change when an impure, solid substance is heated? Four temperature against time graphs are shown. A: temperature rises, then a short sloping (not…
Answer this question and get it marked →The chromatogram of four substances is shown. The baseline is at 0 cm and the solvent front is at 10 cm. The spots are at: A at 5 cm, B at 2.5 cm, C at 7.5 cm and D at 9.5 cm…
Answer this question and get it marked →May–June 2024, Paper 12
White solid X reacts with dilute hydrochloric acid. A gas is produced which turns limewater milky. A flame test on solid X produces a red coloured flame. What is X? A lithium…
Answer this question and get it marked →May–June 2024, Paper 21
Which metal is used in the test for nitrate ions? A aluminium B copper C magnesium D tin
Answer this question and get it marked →May–June 2024, Paper 22
Ammonia is displaced from its salts by reaction with substance Z. Which row identifies substance Z and the test for ammonia? A substance Z hydrochloric acid, test turns red litmus…
Answer this question and get it marked →October–November 2024, Paper 61
A student tests four unknown solutions H, J, K and L. Table 5.1 shows the results of the tests. solution colour flame test NaOH(aq) added excess NH₃(aq) added ---------- --------…
Answer this question and get it marked →May–June 2023, Paper 11
An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then…
Answer this question and get it marked →May–June 2023, Paper 12
Hexane and octane are liquid hydrocarbons that mix together. [Diagrams A-D: separation apparatus, some with heating; D shows fractional distillation with a fractionating column.]…
Answer this question and get it marked →May–June 2023, Paper 21
An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then…
Answer this question and get it marked →May–June 2023, Paper 22
Hexane and octane are liquid hydrocarbons that mix together. [Diagrams A-D: separation apparatus; D shows fractional distillation with a fractionating column and heat.] Which…
Answer this question and get it marked →May–June 2023, Paper 31
Substances are separated from mixtures of substances using different methods. Draw one straight line from each substance to the correct method of separating it from the mixture.…
Answer this question and get it marked →Limestone is insoluble in water. Limestone is mixed with water and poured through filter paper. Explain how filter paper separates limestone from water.
Answer this question and get it marked →October–November 2023, Paper 11
Dye X is a mixture of different coloured substances. Chromatography is used to compare X with three other mixtures, P, Q and R. [Chromatogram: spots for X, P, Q, R; P contains the…
Answer this question and get it marked →Substance X is mixed with aqueous sodium hydroxide. A green precipitate is produced. Which metal ion is present in X? A Cu2+ B Fe2+ C Fe3+ D Zn2+
Answer this question and get it marked →October–November 2023, Paper 21
Dye X is a mixture of different coloured substances. Chromatography is used to compare X with three other mixtures, P, Q and R. [Chromatogram: spots for X, P, Q, R; P contains the…
Answer this question and get it marked →Substance X is mixed with aqueous sodium hydroxide. A green precipitate is produced. Which metal ion is present in X? A Cu2+ B Fe2+ C Fe3+ D Zn2+
Answer this question and get it marked →Other IGCSE Sciences - Co-Ordinated topics
- Motion, forces and energy (77)
- Electricity and magnetism (65)
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- Atoms, elements and compounds (29)
- Organisms and their environment (28)
- Stoichiometry (24)
- Chemical reactions (22)
- The Periodic Table (22)
- Human nutrition (21)
- Reproduction (21)