2023 AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Question Paper & Mark H scheme (Merged) June 2023 [VERIFIED]

2023 AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Question Paper & Mark H scheme (Merged) June 2023 [VERIFIED] GCSE CHEMISTRY Higher Tier Paper 2 Tuesday 13 June 2023 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all 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). • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. Information • The maximum mark for this paper is 100. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL *JUN2384622H01* IB/M/Jun23/E12 8462/2H 2 0 1A student investigated the rate of the reaction between zinc and sulfuric acid. Hydrogen gas is produced during this reaction. Figure 1 shows the apparatus. Figure 1 This is the method used. 1. Add 50 cm3 of sulfuric acid to a conical flask. 2. Add 2.0 g of zinc to the conical flask. 3. Quickly put a stopper in the conical flask and start a timer. 4. Measure the time taken to collect 20 cm3 of gas. 5. Repeat steps 1 to 4 three more times. 0 1 . 1 Suggest why the stopper must be put in the conical flask as quickly as possible in step 3. [1 mark] Do not write outside the box *02* IB/M/Jun23/8462/2H 3 0 1 . 2 The student calculated the rate of the reaction for each trial. Table 1 shows the results of the calculations. Table 1 Trial 1 Trial 2 Trial 3 Trial 4 Rate of reaction in cm3 /s 0.78 0.81 0.68 0.81 Determine the mean time taken to collect 20 cm3 of gas. Do not include any anomalous resu