AQA_AS Level Chemistry Paper 2_Mark Scheme 2022 | Practice Paper 2

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AQA_AS Level Chemistry Paper 2_Mark Scheme 2022 | Practice Paper 2 Q1. (a) (i) M1 (Compounds / molecules with) the same structural formula 2 Penalise M1 if ‘same structure’ or ‘different struc... tural / displayed formula’. M2 with atoms / bonds / groups arranged differently in space OR atoms / bonds / groups with different spatial arrangements / different orientation Ignore references to ‘same molecular formula’ or ‘same empirical formula’. Mark independently. (ii) 1 Credit C–H3C Credit C2H5 Penalise C–CH3CH2 (b) M1 Br2 OR bromine (water) OR bromine (in CCl4 / organic solvent) 1 If M1, has no reagent or an incorrect reagent, CE=0. Ignore ‘acidified’. M2 Isomer 1: decolourised / goes colourless / loses its colour 1 For M1 penalise Br (or incorrect formula of other correct reagent), but mark on. M3 Isomer 2: remains orange / red / yellow / brown / the same OR no reaction / 1 no (observable) change OR reference to colour going to the cyclopentane layer For M1, it must be a whole reagent and / or correct formula. If oxidation state given in name, it must be correct. If ‘manganate’ OR ‘manganate(IV)’ or incorrect formula, penalise M1, but mark on. Alternatives : potassium manganate(VII) M1 KMnO4 in acid M2 colourless M3 purple M1 KMnO4 in alkali / neutral M2 brown solid M3 purple Credit for the use of iodine M1 iodine (solution / in KI) M2 colourless M3 (brown) to purple (credit no change) Credit for the use of concentrated H2SO4 MARK SCHEME Practice Paper 2 Maximum marks: 101 View detailed guidance on the conclusions you can draw from your students' performance in these papers on the MERiT welcome page. Understand how your students compare with others and target revision effectively by entering marks into MERiT. This document is licensed to Haggerston School - MB260045 AS-LEVEL CHEMISTRYPage 2 M1 concentrated H2SO4 M2 brown M3 no change / colourless Ignore ‘goes clear’. Ignore ‘nothing (happens)’. Ignore ‘no observation’. No credit for combustion observations. - - [Show More]

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