plumiSolubility and thermal stability of compounds: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 8.B.3 Solubility and thermal stability of compounds, 2019–2025, with mark schemes and examiner’s reports where available.
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Q17(c)(i)
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Open the full PDFYour answerQ21(c)(i)
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All 40 questions on Solubility and thermal stability of compounds, as a list
- June 2025, AS Unit 2, Q17(c)(i) (3 marks): Explain, with reference to the thermal stability of the Group 2 carbonates, why the use of calcium carbonate rather than magnesium carbonate would increase the
- January 2025, AS Unit 2, Q2 (1 mark): A student sketched a graph of the temperature (K) of the decomposition of some of the Group 2 nitrates against the metal’s atomic number. 1200 1100 1000 900 Tem
- January 2025, AS Unit 2, Q5 (1 mark): Which order is correct for the solubilities of Group 2 sulfates? A barium > strontium > magnesium B calcium > strontium > magnesium C magnesium > barium > calci
- October 2024, AS Unit 2, Q4 (1 mark): Which statement about Group 2 elements and their compounds is true? A calcium hydroxide is less soluble than magnesium hydroxide in water B all Group 2 metals g
- October 2024, AS Unit 2, Q5 (1 mark): A compound, which is a white solid, gives a red flame test and produces a colourless, acidic gas when heated. What is the identity of the compound? A calcium ca
- October 2024, AS Unit 2, Q16(c)(ii) (2 marks): Barium ions are toxic in aqueous solution. If a solution containing barium ions enters the body, barium poisoning occurs. Describe how drinking magnesium sulfat
- October 2024, AS Unit 2, Q20(e) (6 marks): Compounds of lithium (Group 1) and compounds of magnesium (Group 2) have similar properties. Explain why: the ionic radii of Li+ and Mg2+ are similar • • the th
- October 2024, AS Unit 3, Q1(a)(i) (4 marks): Flame tests can be used to confirm the identity of the cations. Complete the table to show a possible identity for the cations in X, Y and Z, and the colours of
- June 2024, AS Unit 1, Q18(a)(i) (1 mark): Give the name of the second type of reaction. (1)
- June 2024, AS Unit 2, Q6 (1 mark): What are the products formed when lithium nitrate and calcium nitrate are heated separately? Lithium nitrate Calcium nitrate A lithium nitrite and oxygen calciu
- June 2024 (R), AS Unit 2, Q11 (1 mark): Which statement is correct about the solubilities of Group 2 compounds as the group is descended? A the solubility of the hydroxides and sulfates increases for
- June 2024 (R), AS Unit 2, Q12 (1 mark): Which nitrate does not produce brown fumes when heated? A LiNO3 B KNO3 C Ca(NO3)2 D Ba(NO3)2
- June 2024 (R), AS Unit 2, Q18(c) (3 marks): Explain how the enthalpy change for the thermal decomposition of calcium carbonate, CaCO3 , compares to that for magnesium carbonate in (b)(ii). (3)
- June 2024 (R), AS Unit 3, Q2(b)(i) (1 mark): Write an ionic equation for the reaction of magnesium chloride solution with aqueous sodium hydroxide. Include state symbols in your answer. (1)
- June 2024 (R), AS Unit 3, Q2(b)(ii) (1 mark): State what would be observed during this reaction. (1)
- June 2024 (R), AS Unit 3, Q2(b)(iii) (2 marks): It is suspected that a bottle of magnesium chloride solution has been contaminated with barium chloride. Describe a test and its result, other than a flame test
- January 2024, AS Unit 2, Q8 (1 mark): Equal volumes of some 0.01 mol dm–3 solutions were mixed. Which pair of solutions gave the greatest mass of precipitate? A BaCl2 and AgNO3 B BaCl2 and Ag2SO4 C
- January 2024, AS Unit 2, Q21(c)(i) (2 marks): State two observations that would be made. (2) 1 2
- January 2024, AS Unit 2, Q21(c)(ii) (3 marks): Explain why the observations from (c)(i) would be made more quickly if the experiment was repeated with solid anhydrous magnesium nitrate, Mg(NO3)2(s). (3)
- October 2023, AS Unit 2, Q9 (1 mark): Which property decreases as Group 2 is descended? A atomic radius B reactivity of the elements C solubility of the sulfates D thermal stability of the nitrates
- October 2023, AS Unit 2, Q20(b)(ii) (2 marks): The student used the same procedure to determine the solubility of strontium hydroxide. Explain whether or not the mean titre value for strontium hydroxide woul
- June 2023, AS Unit 3, Q4(d) (2 marks): Dissolving calcium hydroxide in water is an exothermic process. Describe what you would see if the saturated solution of calcium hydroxide was heated from room
- January 2023, AS Unit 2, Q9 (1 mark): Compound Q produces • a red colour in a flame test • a white precipitate when aqueous potassium sulfate is added to a solution of the compound. What is compound
- January 2023, AS Unit 2, Q21 (6 marks): *21 Discuss some aspects of the thermal stability of the anhydrous nitrates of the elements in Groups 1 and 2 of the Periodic Table. In your answer you should e
- October 2022, AS Unit 2, Q5 (1 mark): Which property decreases as Group 2 of the Periodic Table is descended? A reactivity of the elements B solubility of the hydroxides C solubility of the sulfates
- October 2022, AS Unit 2, Q10 (1 mark): Which nitrate forms oxygen as the only gaseous product on heating? A LiNO3 B NaNO3 C Mg(NO3)2 D Ca(NO3)2
- June 2022, AS Unit 2, Q15(a) (3 marks): Calcium carbonate decomposes on heating. CaCO3(s) → CaO(s) + CO2(g) Explain why calcium carbonate decomposes at a higher temperature than magnesium carbonate, i
- January 2022, AS Unit 2, Q23(b) (3 marks): Magnesium carbonate undergoes thermal decomposition at a higher temperature than magnesium ethanedioate. MgCO3 → MgO + CO2 Explain the trend in the thermal deco
- October 2021, AS Unit 2, Q8 (1 mark): Data for some Group 1 and Group 2 cations are shown in the table. Cation Ionic radius / nm Ionic charge W 0.100 +2 X 0.138 +1 Y 0.113 +2 Z 0.149 +1 Which cation
- June 2021, AS Unit 2, Q21(b) (3 marks): In practice, magnesium carbonate also decomposes on stronger heating. Describe and explain the trend in the thermal decomposition of Group 2 carbonates. (3)
- June 2021, AS Unit 2, Q21(c) (1 mark): Suggest why a pure sample of magnesium carbonate will not be produced from the decomposition of magnesium oxalate even if the sample is heated for longer. (1)
- October 2020, AS Unit 2, Q8(a) (1 mark): Which of these compounds could be Q? (1) A barium nitrate B lithium nitrate C magnesium nitrate D rubidium nitrate
- October 2020, AS Unit 2, Q14(c) (2 marks): The experiment was repeated using the same hydrochloric acid with a saturated solution of magnesium hydroxide. Explain the difference (if any) in the mean titre
- October 2020, AS Unit 3, Q1(a) (2 marks): Identify, by name or formula, the two gases formed. (2)
- October 2020, AS Unit 3, Q1(d) (2 marks): Give the formula of solid A and the formula of the white solid formed on heating. (2) Solid A White solid
- October 2020, AS Unit 3, Q1(e) (2 marks): About 5 cm3 of an aqueous solution of A was placed in each of two test tubes. Five drops of aqueous sodium hydroxide were added to one of the test tubes and fiv
- January 2020, AS Unit 2, Q8 (1 mark): The properties of Group 2 compounds change down the group from magnesium to barium. Which statement is correct? A solubility of Group 2 sulfates increases B sol
- June 2019, AS Unit 2, Q8 (1 mark): Which of these sulfates is the least soluble in water? A CaSO4 B BaSO4 C K2SO4 D Rb2SO4
- June 2019, AS Unit 2, Q20(a)(i) (1 mark): State why the student used a warm oven to remove the water from the hydrated salt, rather than direct heating with a Bunsen burner. (1)
- June 2019, AS Unit 2, Q20(b)(iii) (4 marks): Explain the trend in thermal stability of Group 2 carbonates. (4)
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