AQA 2022// GCSE CHEMISTRY Higher Tier Paper 2

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 ...

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 PR