Exams for chemistry Study guides, Revision notes & Summaries

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MARK SCHEME – A-level Question Answers Additional comments/Guidelines Mark M1 ΔfH = ΔaH (Sr) + 2ΔaH (Cl) + Δ1st IEH (Sr) + Δ2nd IEH (Sr) + 2ΔEAH(Cl) + ΔLEH (Sr) Or – 828 = 164 + (2 x 121) + 548 + 1060 + (2 x ΔEAH) + (– 2112) 1 01.1 M2 2 x ΔEAH = – 730 1 M3 ΔEAH = – 365 (kJ mol–1) Allow M3 = M2÷2 (+) 365, –304.5, and –730 = 2 marks (+) 304....

AQA A-level CHEMISTRY 74051 Paper 1 Inorganic and Physical Chemistry Mark scheme January 2023, Exams for C

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This document is a detailed and extensive guide for all of the 12 required practicals for AQA A level and AS Level chemistry. Revising the core practicals for exams can be difficult, so I prepared a resource which not only contains the method for each practical but also highlights where specific equipment/techniques/chemicals are being used and explains WHY it is being used (learning these will make core practical-related questions significantly easier). Key observations have additionally been h...

AQA A-level CHEMISTRY 7405/1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2022, Exams for Chemistry.Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates participate in and is the scheme which was used by them in this examination. The standardisation process ensures that the mark scheme covers the...

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

1 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 MARK SCHEME – A-LEVEL CHEMISTRY – 7405/1 – JUNE...

AQA A-level CHEMISTRY 74051 Paper 1 Inorganic and Physical Chemistry Mark scheme January 2023, Exams for C