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Download Actual 2025 AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Merged Question Paper + Mark S and more Exams Chemistry in PDF only on Docsity!
Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature | declare this is my own work. GCSE CHEMISTRY Higher Tier Paper 2 Friday 13 June 2025 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: * aruler * ascientific calculator « the periodic table (enclosed). Instructions e 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. 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. In all calculations, show clearly how you work out your answer. You are reminded of the need for good English and clear presentation in your answers. For Examiner's Use Question Mark 1 e@/N|oa}alalolr TOTAL 25846 2 240 IB/G/Jun25/G4007/E10 8462/2H 1 (o[1}.[2| (o[4 [3] (o]1][4] A student investigated the mass of dissolved solids in sea water. This is the method used. 1. Weigh an empty evaporating basin. 2. Measure 10.0 cm? of sea water sample A into the evaporating basin using a burette. 3. Heat the evaporating basin until all the water seems to have evaporated. 4. Weigh the evaporating basin and contents. 5. Calculate the mass of dissolved solids in the sample. 6. Repeat steps 1 to 5 with sea water samples B, C and D. Why did the student use a burette rather than a measuring cylinder to measure 10.0 cm? of each sample? [1 mark] What was the dependent variable in this investigation? [1 mark] Describe how the student could make sure all of the water had evaporated in step 3. [2 marks] How did the student calculate the mass of dissolved solids in each sea water sample? [1 mark] 02 IB/G/Jun25/8462/2H Do not write outside the box This question is about hydrocarbon fuels. Figure 1 represents the process used to separate hydrocarbon fuels from crude oil. Figure 1 —> A Column Increasing temperature Crude oil —> Heater [o[2].[1| Name the process represented by Figure 1. [1 mark] [o|2].[2| Changes of state take place during the process in Figure 1. Name the change of state taking place in: e the heater e the column. [2 marks] Heater Column IML IB/G/Jun25/8462/2H Do not write outside the box Different fuels are obtained from crude oil at the points on Figure 1 labelled A to E. Table 2 shows the boiling point ranges of different fuels obtained from the process in Figure 1. Table 2 Fuel Boiling point range in °C Diesel oil 260 — 320 Heavy fuel oil 320 — 400 Kerosene 180 — 260 Petrol 40-110 Petroleum gases Below 30 [0] 2].[3] Which fuel is obtained at B in the column? Use Figure 1 and Table 2. [1 mark] [o[2].[4] Fuels with higher boiling point ranges contain larger molecules. What is the order of increasing flammability of the fuels? Use Table 2. [1 mark] Tick (“) one box. Heavy fuel oil —> diesel oil —> kerosene Heavy fuel oil —> kerosene —> diesel oil Kerosene —> diesel oil —> heavy fuel oil Kerosene — heavy fuel oil — diesel oil 05 Turn over > IB/G/Jun25/8462/2H Do not write outside the box Turn over for the next question DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED IMA Turn over > IB/G/Jun25/8462/2H Do not write outside the box Doors can be made from aluminium or wood. [0[3].[1| Table 3 gives information about aluminium and wood. Table 3 Aluminium Wood Raw material Metal ore from rock Trees Relative cost of 87 1 1 kilogram of material Relative strength 1.3 1.0 Protection No protection needed to prevent corrosion Painted to prevent rotting Disposal Melted to form new products Shredded into wood chips for fuel Evaluate the use of aluminium and of wood for making doors. [6 marks] Extra space 08 IB/G/Jun25/8462/2H Do not write outside the box 10 The Earth’s atmosphere has changed over time. [0[4].[1| Explain how the percentage of nitrogen changed in the Earth’s early atmosphere. [2 marks] [0[4].[2] Table 4 shows the percentage (%) of carbon dioxide present in the Earth’s early atmosphere. Table 4 Time in billions of years ago Percentage (%) of carbon dioxide in the Earth’s early atmosphere 45S 98 4.0 54 3.5 30 3.0 21 The percentage of carbon dioxide in the Earth’s early atmosphere changed between 4.5 billion and 3.0 billion years ago. Give two reasons why. [2 marks] 10 IB/G/Jun25/8462/2H Do not write outside the box 10 11 Do not write outside the [0[4].[3] Complete Figure 3. box You should: e plot the data in Table 4 e draw a line of best fit. [2 marks] Figure 3 100 80 Percentage (%) of carbon 60 dioxide in the Earth’s early atmosphere 40 20 0) 45 4.0 3:5 3.0 Time in billions of years ago Question 4 continues on the next page Turn over > INIA IB/GiJun25/8462/2H 11 13 This question is about unsaturated hydrocarbons. [0[5].[1| Table 6 shows the boiling points of some unsaturated hydrocarbons. Table 6 Formula of unsaturated hydrocarbon Boiling point in °C CoH4 — 104 CaHe -47 C4He x CsHi10 30 CoHi2 63 Estimate the boiling point X in Table 6. °C [0[5].[2| C2Hs reacts with water vapour (steam). Name the compound produced when C2Hs reacts with water vapour. Question 5 continues on the next page [1 mark] [1 mark] 13 Turn over > IB/G/Jun25/8462/2H box Do not write outside the 13 14 (o[5] [3] (o[5][4] Ca4Hs reacts with chlorine (Cly). Describe the test for chlorine. Give the result of the test. Test [2 marks] Result Which is the displayed formula of the organic compound produced when CaHs reacts with chlorine? Tick (v) one box. TEL mere H H H H TEL Sanne Cl H H H ‘Et err cl cl HH [1 mark] IM IB/G/Jun25/8462/2H Do not write outside the box 14 16 (o[6|}.[1] (o[6][2] A student analysed three solutions, A, B and C. Each solution contained one ionic compound. The student added a few drops of sodium hydroxide solution to solution A. Solution A produced a white precipitate. Aluminium ions produce a white precipitate with a few drops of sodium hydroxide solution. Name one other metal ion which produces a white precipitate with a few drops of sodium hydroxide solution. [1 mark] Describe how the student could confirm the presence of aluminium ions in solution A. Give the result of the test. [2 marks] Test Result 16 IB/G/Jun25/8462/2H Do not write outside the box 16 17 The student tested solution B to identify the ions present. [o[6].[3| The student did a flame test on solution B. An orange-red flame was produced. Write the symbol for the metal ion in solution B. [1 mark] [o[6].[4| The student added dilute nitric acid followed by silver nitrate solution to solution B. A white precipitate was produced. Write the symbol for the non-metal ion in solution B. [1 mark] Question 6 continues on the next page Turn over > IB/G/Jun25/8462/2H 17 Do not write outside the box 17 19 [1] Name compound A and compound B. {2 | Compound A and compound B react to produce a condensation polymer. [3] Name the small molecule lost when molecules of compound A and of This question is about polymers. A condensation polymer is produced from two different compounds, A and B. Figure 4 represents a molecule of A and a molecule of B. Figure 4 A HO— CH,— CH,— OH B HOOC — CH,— CH)— CH»— CH»— COOH [2 marks] Name the type of condensation polymer produced from compound A and compound B. [1 mark] compound B react. [1 mark] 1 Turn over > IB/G/Jun25/8462/2H Do not write outside the box 19 20 Do not write outside the Glycine is an amino acid. box Glycine can produce condensation polymers. Name the type of condensation polymer produced when glycine polymerises. [1 mark] Complete Figure 5 to show the displayed structural formula of glycine. [1 mark] Figure 5 H H N—C—C H H Which polymer is produced when different amino acids are combined in the same chain? [1 mark] Tick (“) one box. Cellulose DNA Protein Starch 20 IB/G/Jun25/8462/2H 20 
