2023 AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS CHEMISTRY Paper 2 Organic and Physical Chemistry Tuesday 23 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • the Periodic Table/Data Sheet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • All working must be shown. • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 80. For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 Section B TOTAL Advice You are advised to spend about 65 minutes on Section A and 25 minutes on Section B. 2 Section A Answer all questions in this section. 0 1This question is about the analysis of organic compounds. For each pair of compounds in Questions 01.1 and 01.2, give a reagent (or combination of reagents) that could be added separately to each compound in a single reaction to distinguish between them. State what is observed in each case. 0 1 . 1CH3CH2CH2CHO and CH3CH2CH(OH)CH3 [3 marks] Reagent(s) Observation with CH3CH2CH2CHO Observation with CH3CH2CH(OH)CH3 0 1.2 Cyclohexane and cyclohexene [3 marks] Reagent(s) Observation with cyclohexane Observation with cyclohexene Do not write outside the box *02* IB/M/Jun23/7404/2 3 0 1 . 3 Table 1 gives the precise relative molecular masses (Mr) of some organic compounds measured using high resolution mass spectrometry. Table 1 Molecular formula C5H12 C5H10 C6H6 Mr 72.1416 70.1260 to be calculated Use these data to find the relative atomic masses (Ar) of hydrogen and carbon. Give your answers to 4 decimal places. Use these calculated Ar values to find the relative molecular mass (Mr) of C6H6 Give your answer to 4 decimal places.