AQA- AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Version: 1.0 Final *JUN2384622H01* IB/M/Jun23/E12 8462/2H QUESTION PAPER & MARKING SCHEME/ [MERGED] Marl( scheme June 2023

AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Version: 1.0 Final *JUN2384622H01* IB/M/Jun23/E12 8462/2H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL 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. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE CHEMISTRY Higher Tier Paper 2 H 2 *02* IB/M/Jun23/8462/2H Do not write outside the 0 1 box A 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] 3 *03* Turn over ► IB/M/Jun23/8462/2H Do not write outside the 0 1 box . 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 results. Use the equation: mean rate of reaction = volume of gas collected mean time taken [5 marks] Mean time taken = s Question 1 continues on the next page 4 *04* IB/M/Jun23/8462/2H Do not write outside the 0 1 box . 3 The student changed the investigation so that the mean time taken to collect 20 cm3 of gas was greater. Which two changes would increase the mean time taken to collect 20 cm3 of gas? [2 marks] Tick () two boxes. Use a catalyst Use a larger conical flask Use a lower temperature Use smaller pieces of zinc Use sulfuric acid of a lower concentration 0 1 . 4 Hydrogen gas is produced during this reaction. Describe the test for hydrogen gas. Give the result of the test. [2 marks] Test Result 10 5 *05* Turn over ► IB/M/Jun23/8462/2H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 6 *06* IB/M/Jun23/8462/2H Do not write outside the 0 2 This question is about alcohols and carboxylic acids. box Alcohols are used as fuels. A student burned 1.00 g of six alcohols and determined the energy released from each. Table 2 shows the results. Table 2 Alcohol Formula of one molecule of the alcohol Energy released in kJ/g Ethanol C2H5OH 29.6 Propanol C3H7OH 33.6 Butanol C4H9OH 36.1 Pentanol C5H11OH 37.7 Hexanol C6H13OH 38.9 Heptanol C7H15OH 39.8 0 2 . 1 Calculate the mass of ethanol that must be burned to release the same amount of energy as burning 1.00 g of heptanol. [2 marks] Mass = g 0 2 . 2 The energy released in kJ/g varies with the number of carbon atoms in one molecule of each alcohol. Plot the data from Table 2 on Figure 2. [2 marks] 7 *07* Turn over ► IB/M/Jun23/8462/2H Do not write outside the Figure 2 box 0 2 . 3 Estimate the energy released in kJ when 1.00 g of octanol (C8H17OH) is burned. Use Figure 2. [1 mark] Energy released = kJ 8 *08* IB/M/Jun23/8462/2H Do not write outside the Carbon dioxide is produced when alcohols are burned. box Carbon dioxide is identified by bubbling the gas through limewater. 0 2 . 4 Complete the sentence. Choose the answer from the box. [1 mark] calcium chloride calcium hydroxide calcium nitrate calcium sulfate Limewater is an aqueous solution of . 0 2 . 5 Give the result of the test when carbon dioxide is bubbled through limewater. [1 mark] 9 *09* Turn over ► IB/M/Jun23/8462/2H Do not write outside the Ethanoic acid can be produced from ethanol. box 0 2 . 6 What is reacted with ethanol to produce ethanoic acid? [1 mark] Tick () one box. A halogen An alkali metal An oxidising agent Water 0 2 . 7 Ethanoic acid contains the functional group –COOH Complete the displayed structural formula of this functional group. [1 mark] Question 2 continues on the next page 10 *10* IB/M/Jun23/8462/2H Do not write outside the 0 2 box . 8 Ethanoic acid reacts with different compounds. Draw one line from each compound to a product of the reaction of the compound with ethanoic acid. [2 marks] Compoun