AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Question Paper + Mark scheme [MERGED] June 2022 *jUN2284622H01* IB/M/Jun22/E9 8462/2H For Examiner’s Use Question Mark 1

AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Question Paper + Mark scheme [MERGED] June 2022 *jUNH01* IB/M/Jun22/E9 8462/2H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 TOTAL 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/Jun22/8462/2H Do not write outside the 0 1 This question is about copper wire and copper compounds. box Copper is used to make electrical wires. Figure 1 shows how copper electrical wire is insulated using an addition polymer called poly(butene). Figure 1 0 1 . 1 The addition polymer poly(butene) has the displayed structural formula: Poly(butene) is produced from the monomer butene. Complete Figure 2 to show the displayed structural formula of butene. [2 marks] Figure 2 3 *03* Turn over ► IB/M/Jun22/8462/2H Do not write outside the Copper can be obtained by recycling scrap copper wire. box 0 1 . 2 Suggest why poly(butene) insulation must be removed from scrap copper wire before the copper is recycled. [1 mark] 0 1 . 3 Describe how scrap copper wire can be recycled to make new copper water pipes. [2 marks] 0 1 . 4 Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores. [2 marks] 1 2 Question 1 continues on the next page 4 *04* IB/M/Jun22/8462/2H Do not write outside the box 11 Copper sulfate is a compound of copper. Copper sulfate solution contains copper(II) ions and sulfate ions. 0 1 . 5 A solution can be added to copper sulfate solution to show the presence of copper(II) ions. Name the solution added. Give the result of the test. [2 marks] Name of solution added Result 0 1 . 6 Describe one test to show the presence of sulfate ions in copper sulfate solution. Give the result of the test. [2 marks] Test Result 5 *05* Turn over ► IB/M/Jun22/8462/2H 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/Jun22/8462/2H Do not write outside the 0 2 A student investigated the change in mass when hydrated cobalt chloride was heated. box The word equation for the reaction is: hydrated cobalt chloride ⇌ anhydrous cobalt chloride + water This is the method used. 1. Add 2.0 g of hydrated cobalt chloride to an empty test tube. 2. Measure the mass of the test tube and contents. 3. Heat the test tube and contents gently for 30 seconds. 4. Allow the test tube and contents to cool. 5. Measure the mass of the test tube and contents. 6. Repeat steps 3 to 5 until the mass of the test tube and contents does not change. Table 1 shows the results. Table 1 Total heating time in seconds Mass of test tube and contents in grams 0 26.5 30 26.2 60 25.9 90 25.6 120 25.6 7 *07* Turn over ► IB/M/Jun22/8462/2H Do not write outside the 0 2 . 1 Determine the mass of the empty test tube. box [1 mark] Mass of empty test tube = g 0 2 . 2 Explain why the mass of the test tube and contents decreased. [2 marks] 0 2 . 3 Suggest why the test tube and contents were heated until the mass did not change. [1 mark] Question 2 continues on the next page 8 *08* IB/M/Jun22/8462/2H Do not write outside the box 8 Energy is taken in from the surroundings when hydrated cobalt chloride is heated. 0 2 . 4 When 238 g of hydrated cobalt chloride is heated until the mass does not change, 88.1 kJ of energy is taken in. The student heated 2.00 g of hydrated cobalt chloride until the mass did not change. Calculate the energy taken in during this reaction. Give your answer to 3 significant figures. [3 marks] Energy taken in (3 significant figures) = kJ 0 2 . 5 What type of reaction takes place when hydrated cobalt chloride is heated? [1 mark] 9 *09* Turn over ► IB/M/Jun22/8462/2H Do not write outside the Turn over for the next question box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 10 *10* IB/M/Jun22/8462/2H Do not write outside the 0 3 This question is about life cycle assessments (LCAs). box 0 3 . 1 Milk bottles can be made from glass or from a polymer. Table 2 shows information about milk bottles of equal volume. Table 2 Glass Polymer Raw materials Limestone Sand Sodium carbonate Crude oil Energy needed to process raw materials in kilojoules Energy needed to manufacture bottle in kilojoules 750 90 Mass of bottle in grams 200 20 Mean number of times used during lifetime of bottle 25 1 One disposal method at end of useful life Recycled to make different glass products Recycled to make different polymer products Evaluate the use of glass for milk bottles compared with the use of a polymer for milk bottles. Use features of life cycle assessments (LCAs) in your answer. Use Table 2. [6 marks] 11 *11* Turn over ► IB/M/Jun22/8462/2H Do not write outside the box 9 0 3 . 2 Milk is also sold in cardboard cartons. A carton is made using 40 cm3 of cardboard. The density of the cardboard is 0.40 g/cm3. Calculate the mass of the carton. Use the equation: density = mass volume [3 marks] Mass = g 12 *12* IB/M/Jun22/8462/2H Do not write outside the 0 4 This question is about the fractions obtained from crude oil. box 0 4 . 1 Crude oil is separated into fractions by fractional distillation. The fractions obtained from crude oil include: • lubricating oil • naphtha • petroleum gases. Table 3 shows the boiling point range of these fractions. Table 3 Fraction Boiling point range in °C Lubricating oil 300–350 Naphtha 90–200 Petroleum gases < 25 Explain how these fractions are obtained from crude oil by fractional distillation. [4 marks] 13 *13* Turn over ► IB/M/Jun22/8462/2H Do not write outside the 0 4 . 2 Fractions from crude oil can be processed to produce feedstock for the box petrochemical industry. Which two are useful materials produced from this feedstock? [2 marks] Tick () two boxes. Alloys Ceramics Detergents Fertilisers Solvents Another fraction obtained from crude oil is petrol. 0 4 . 3 Petrol contains a hydrocarbon with the formula C9H20 Complete the equation for the complete combustion of C9H20 You should balance the equation. [2 marks] C9H20 + __________ → __________ + __________ 0 4 . 4 Petrol obtained from crude oil contains sulfur impurities. Explain why sulfur impurities are removed before petrol is burned in car engines. [2 marks] 14 *14* IB/M/Jun22/8462/2H Do not write outside the 0 4 . 5 Table 4 shows information about two more fractions obtained from crude oil. box Table 4 Fraction Range of number of carbon atoms in each molecule Kerosene 11–15 Heavy fuel oil 20–40 A student predicted that heavy fuel oil is more viscous than kerosene. The student’s prediction was correct. Justify the student’s prediction. [2 marks] 15 *15* Turn over ► IB/M/Jun22/8462/2H Do not write outside the box 16 The heavy fuel oil fraction can be processed to produce smaller hydrocarbon molecules. 0 4 . 6 Name the process which produces smaller hydrocarbon molecules from heavy fuel oil. Give the conditions used in this process. [3 marks] Name of process Conditions 0 4 . 7 Hydrocarbon molecules containing seven and eight carbon atoms can be produced when heavy fuel oil is processed. Which pair of hydrocarbon molecules would both turn bromine water colourless? [1 mark] Tick () one box. C7H14 and C8H16 C7H14 and C8H18 C7H16 and C8H16 C7H16 and C8H18 16 *16* IB/M/Jun22/8462/2H Do not write outside the box There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 17 *17* Turn over ► IB/M/Jun22/8462/2H Do not write outside the 0 5 This question is about water. box 0 5 . 1 Sewage is waste water. Sewage contains organic matter. Describe how sewage is treated to remove organic matter. [4 marks] Question 5 continues on the next page 18 *18* IB/M/Jun22/8462/2H Do not write outside the Sea water and ground water are treated to make them potable. box Table 5 shows information about the composition and treatment of sea water and of ground water. Table 5 Sea water Ground water Concentration of sodium ions and chloride ions before Process 1 Na+ : 0.5 mol/dm3 Cl − : 0.5 mol/dm3 Na+ : 0.001 mol/dm3 Cl − : 0.001 mol/dm3 Process 1 Reverse osmosis Filtration Concentration of sodium ions and chloride ions after Process 1 X Na+ : 0.001 mol/dm3 Cl − : 0.001 mol/dm3 Process 2 Add ozone Expose to ultraviolet light 0 5 . 2 Sea water is desalinated during Process 1. Which pair of concentrations could represent X in Table 5? [1 mark] Tick () one box. Na+ : 0.003 mol/dm3 Cl − : 0.003 mol/dm3 Na+ : 0.003 mol/dm3 Cl − : 0.5 mol/dm3 Na+ : 0.5 mol/dm3 Cl − : 0.003 mol/dm3 Na+ : 0.5 mol/dm3 Cl − : 0.5 mol/dm3 0 5 . 3 Explain why the concentrations of sodium ions and of chloride ions in the ground water in Table 5 are unchanged by Process 1. [2 marks] 19 *19* Turn over ► IB/M/Jun22/8462/2H Do not write outside the box 12 0 5 . 4 Explain why the ground water in Table 5 req