AQA • Chemistry

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...

M1 Δf H = Δa H (Sr) + 2Δa H (Cl) + Δ1st IE H (Sr) + Δ2nd IE H (Sr) + 2ΔEA H(Cl) + ΔLEH (Sr) 1 Or – 828 = 164 + (2 x 121) + 548 + 1060 + (2 x ΔEAH) + (– 2112) 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 1 (+) 304.5, (+) 730 and –609 = 1 mark (+) 609 = 0 marks

A Level AQA Chemistry Mark Scheme paper 3 2022

A Level AQA Chemistry Question Paper 2 2022

A Level AQA Chemistry Paper 1 Mark Scheme 2022

Fluoride ion has (two) fewer protons/lower nuclear charge Weaker attraction between nucleus and (outer) electrons Do not allow fluorine, but allow fluorine ion Any reference to different numbers of electrons in the ions loses M1 Allow answers in terms of sodium ion but must be explicit. Ignore references to atomic radius 1 1

AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2020. GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2020 Version: 1.0 Final Mark Scheme *206g8464c2h/MS* MARK SCHEME – GCSE COMBINED SCIENCE: TRILOGY – 8464/C/2H – JUNE 20 2 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 ...

AS level paper 1 Chemistry 2021

These are detailed Revision Notes for Topic 1.12 of AQA A-Level Chemistry (Acids, Bases and Buffers). They were written by me using a combination of the textbook and class notes. I will also be uploading the other topics and creating bundles. Topics Included: - Defining an acid - The pH scale - Weak acids and bases - Acid-base titrations - Choice of indicators for titrations - Buffer solutions