Chemistry > AQA > AQA_A Level Chemistry Paper 2_Mark Scheme 2022 | Practice Paper 2 (All)

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

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AQA A 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 ‘differ... ent structural / 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 - - - [Show More]

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