A-Level ChemistryYear 2023Q7
16 7 This question is about ions. (a) Draw a dot‑and‑cross diagram of the ionic compound potassium chloride. Show outer shell electrons only. (1) (b) Deduce the order of increasing size of the ions: Br–, Ca2+, Cl–, K+ Justify your answer. (4) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... Turn over 17 (c) A saturated aqueous calcium hydroxide solution contains 17.3 g in 10.0 dm3 of solution. Under these conditions the calcium hydroxide is fully dissociated into ions. What is the concentration of the calcium ions in this solution, in mol dm–3 ? (1) A 0.0233 B 0.0303 C 0.0431 D 0.0597 (Total for Question 7 = 6 marks)
Paper Source:EDACH378ch0-01-que-20230517.pdf
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Exam Specification Info
This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectChemistry
Official MarksVariable (2–6 marks)
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