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AQA JUNE 2022 CHEMISTRY A LEVEL 7405 PAPER 3 MARKSCHEME AS and A-Level Chemistry Mark Scheme Instructions for Examiners 1. General The mark scheme for each question shows:  the marks available for each part of the question  the total marks available for the question  the typical answer or answers which are expected  extra information to help the examiner make his or her judgement and help to delineate what is acceptable or not worthy of credit or, in discursive answers, to ...