AQA A level CHEMISTRY 7405 1 Paper 1 Inorganic and

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AQA A-level CHEMISTRY 7405-1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2022, Exams for Chemistry

AQA A-level CHEMISTRY 7405-1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2022, Exams for Chemistry
Exam (elaborations) • 39 pages • 2023

M1 Δf H = Δ a H (Sr) + 2ΔaH (Cl) + Δ 1st IE H (Sr) + Δ 2nd IE H (Sr) + 2ΔEA H(Cl) + ΔLEH (Sr) 1 Or – 828 = 164 + (2 x 121) + 548 + 1060 + (2 xΔEA H) + (– 2112) 01.1 M2 2 x ΔEA H = – 730 1 M3 ΔEA H = – 365 (kJ mol–1 ) Allow M3 = M2÷2 (+) 365, –304.5, and –730 = 2 marks 1 (+) 304.5, (+) 730 and –609 = 1 mark (+) 609 = 0 marks 11 –3889BaCl2 01.2 –2493MgO –2018MgCl2 1 All three lines must be shown