Partial preview of the text
Download Actual 2024 AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Merged Question Paper + Mark Sc and more Exams Chemistry in PDF only on Docsity!
Actual 2024 AQA GCSE CHEMISTRY 8462/2H Paper 2 Higher Tier Merged Question Paper + Mark Scheme AQA= 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 Tuesday 11 June 2024 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: For Examiner's Use * aruler ¢ ascientific calculator Question Mark « the periodic table (enclosed). 1 Instructions 2 e Use black ink or black ball-point pen. 3 e Pencil should only be used for drawing. 4 Fill in the boxes at the top of this page. e Answer all questions in the spaces provided. Do not write outside 5 the box around each page or on blank pages. 6 ¢ If you need extra space for your answer(s), use the lined pages at the end of T this book. Write the question number against your answer(s). 8 ¢ Do all rough work in this book. Cross through any work you do not want to be marked. 9 . TOTAL Information ¢ The maximum mark for this paper is 100. e The marks for questions are shown in brackets. e You are expected to use a calculator where appropriate. ¢ Inall calculations, show clearly how you work out your answer. « You are reminded of the need for good English and clear presentation in your answers. 8462/2H IB/M/Jun24/G4005/E11 [o[1 [2] A student investigated an aqueous solution of a salt. The student identified that the salt solution contained only sodium ions and chloride ions. Describe a test to identify sodium ions. Give the result of the test. [2 marks] Test for sodium ions Result Describe a test to identify chloride ions. Give the result of the test. [2 marks] Test for chloride ions Result 02 IB/M/Jun24/8462/2H Do not write outside the box 2 Do not write outside the [o[1].[5] The student calculated the concentration of sodium chloride in the salt solution. box Table 1 shows the results. Table 1 Concentration of sodium chloride in g/dm* Trial 1 Trial 2 Trial 3 Trial 4 35.2 34.6 36.4 33.8 The percentage by mass of sodium ions in sodium chloride is 39.3%. Calculate the mean concentration of sodium ions in the salt solution. [4 marks] Mean concentration = g/dm? 04 IB/M/Jun24/8462/2H 4 Do not write “ —" . ae 7 outside the This question is about ammonia and nitric acid. box In the Haber process ammonia is produced from nitrogen and hydrogen. Figure 1 represents the Haber process. Figure 1 Nitrogen gas Hydrogen gas | Reactor 450 °C 200 atmospheres Metal catalyst Pipe P Condenser Liquid ammonia [o[2].[1] Pipe P links the condenser to the reactor. Why is the condenser linked to the reactor? Use Figure 1. [1 mark] [o|2].[2] Which metal is used as a catalyst in this reaction? [1 mark] Turn over > MUN IB/M/Jun24/8462/2H 5 Do not write outside the [o|2].[4| Complete the reaction profile for the catalysed reaction in Figure 2. box You should: e label the activation energy e label the reactants and products, using the names of the reactants and products. [2 marks] [o|2].[5| How would Figure 2 be different if no catalyst was used? [1 mark] Tick (“) one box. The final energy level would be higher. The final energy level would be lower. The line would reach a higher peak. The line would reach a lower peak. [o[2].[6| Ammonia and nitric acid react to produce the salt, ammonium nitrate. Ammonium ions and nitrate ions both contain nitrogen. Suggest one use of ammonium nitrate. [1 mark] Turn over for the next question Turn over > 07 IB/M/Jun24/8462/2H 7 Do not write outside the There are no questions printed on this page box DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED IMA IB/M/Jun24/8462/2H 8 10 Do not write outside the [o|3].[3| Water collected from rivers is used in the home for drinking and flushing toilets. box Water used in the home must be potable. Potable water is safe to drink. Waste water produced after use in the home is called sewage. Figure 3 shows how water is collected from rivers and returned to rivers after use. Figure 3 Use in the home Sewage /— Process B sy To treat sewage Potable water Sewage Process A _ Metal grid To produce potable water af Effluent —+ Sludge Ground Effluent water INI IB/M/Jun24/8462/2H 10 11 Explain what happens to water in Process A and in Process B in Figure 3. Do not refer to use of water in the home. [6 marks] Turn over for the next question Do not write outside the box INI Turn over > IB/M/Jun24/8462/2H 11 13 Do not write outside the [o|4].[2| The student used the same type of chromatography paper in Experiment 1 and in box Experiment 2. Explain why the yellow dye is in different positions in Experiment 1 and in Experiment 2. Use Figure 4. [3 marks] Question 4 continues on the next page Turn over > 13 IB/M/Jun24/8462/2H 13 14 Do not write outside the Figure 4 is repeated below. box Figure 4 shows the results of Experiment 1 and Experiment 2 using orange dye A. Figure 4 Solvent front Solvent front 1— Yellow dye — |___|-Yellow dye | ee |—Red dye |—Red dye ae — lo e— Start line Start line —_ [a}- Water —_I pa Ethanol Experiment 1 Experiment 2 The student investigated a different orange dye (B). Figure 5 shows the results of Experiment 3 using orange dye B. Figure 5 Solvent front | Orange dye | +4 el Start line i p_- Ethanol Experiment 3 INI IB/M/Jun24/8462/2H 14 16 Do not write outside the [o|4].[6| Another type of chromatography is called gas chromatography. box Gas chromatography is an instrumental method of chemical analysis. Scientists tested the orange dyes using gas chromatography. Suggest two advantages of using the instrumental method of gas chromatography rather than paper chromatography. [2 marks] 1 2 13 16 IB/M/Jun24/8462/2H 16 17 Do not write = outside the Turn over for the next question box DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED Turn over > IMI IB/M/Jun24/8462/2H 17 19 Do not write outside the [o|5].[2| Explain one positive impact on the environment of burning hydrogen rather than box natural gas as a fuel. Use Table 2. [2 marks] [o|5].[3| Explain one negative impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2. [2 marks] Question 5 continues on the next page Turn over > IB/M/Jun24/8462/2H 19 20 [0] 5|.[4] Air is 20% oxygen. Calculate the volume of air needed to provide enough oxygen to react with 3.50 dm? [o[5].[5| Central heating boilers can also bum kerosene. Kerosene is produced from crude oil in a fractionating column using fractional of hydrogen gas. The equation for the reaction is 2H2 + O2 > 220 [3 marks] distillation. In the first step, crude oil is heated and hydrocarbon vapours are formed. Explain how kerosene is produced from these hydrocarbon vapours. Volume of air = dm? [3 marks] Do not write outside the box 20 IB/M/Jun24/8462/2H 20 
