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Download 2024 AQA GCSE COMBINED SCIENCE: SYNERGY 8465/3H Paper 3 Question Paper + Mark Scheme + Ins and more Exams Physical Activity and Sport Sciences in PDF only on Docsity!
2024 AQA GCSE COMBINED SCIENCE: SYNERGY 8465/3H Paper 3 Question Paper + Mark Scheme + Inserts AQA Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature GCSE COMBINED SCIENCE: SYNERGY Higher Tier Paper 3 Physical Sciences | declare this is my own work. Friday 7 June 2024 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: aruler Question Mark a protractor 4 a scientific calculator the periodic table (enclosed) the Physics Equations Sheet (enclosed). For Examiner's Use 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 TOTAL to be marked. e Inall calculations, show clearly how you work out your answer. @/N}/oalal|al|wlrn Information e 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. 000 ee anee/ai {o[4)}-[2] IML Enzymes are large molecules and biological catalysts. What type of molecule is an enzyme? Do not write outside the box [1 mark] A catalyst changes the rate of a chemical reaction. What happens to the mass of a catalyst during a chemical reaction? Tick (“) one box. The mass of the catalyst decreases. The mass of the catalyst stays the same. The mass of the catalyst increases. [1 mark] G/Jun24/8465/3H 2 (o[4]-[5] {o[4}-[6] IML Do not write outside the Amylase is an enzyme that breaks down starch. box A student investigated how changing the pH affected the activity of amylase. This is the method used. 1. Heat a test tube containing 2 cm® of amylase solution at pH 5.0 in a water bath at 35 °C. 2. Heat a test tube containing 2 cm of starch solution in the same water bath. 3. Transfer the amylase solution into the test tube of starch solution and mix. 4. After 30 seconds remove a drop of the amylase—starch mixture and test the drop for starch. 5. Repeat step 4 until no starch is detected. 6. Record the total time taken for no starch to be detected. 7. Repeat steps 1 to 6 using amylase solution at different pH values. Explain why the solutions are all placed in the same water bath. [2 marks] Describe the test for starch. Give the result of the test if starch is present. [2 marks] Test Result G/Jun24/8465/3H 4 Table 1 shows the results. Table 1 Time taken for no starch to be detected pH in seconds 5.0 120 5.5 120 6.0 90 6.5 90 7.0 60 7.5 60 8.0 90 8.5 120 [0] 1]-[7] Which range of pH values had the fastest rate of reaction? AMM Tick (¥) one box. PH 5.0 to pH 5.5 pH 6.0 to pH 6.5 PH 7.0 to pH 7.5 PH 8.0 to pH 8.5 [1 mark] How could the method be improved to obtain a more accurate pH value for the fastest rate of reaction? [1 mark] Do not write outside the box Turn over > G/Jun24/8465/3H Do not write outside the box [0 | 2].[2] Determine the distance travelled by the car between 20 seconds and 45 seconds. Use the Physics Equations Sheet. [2 marks] Distance = m -[3] How does the deceleration of the car compare with the acceleration of the car? Use Figure 2. Give one reason for your answer. [2 marks] Tick (“) one box. The deceleration was greater than the acceleration. The deceleration was the same as the acceleration. The deceleration was less than the acceleration. Reason Question 2 continues on the next page Turn over > G/Jun24/8465/3H 7 IML Do not write outside the -[4] Another remote-controlled car travelled a distance of 80 m while accelerating from 0 m/s to 16 mis. Calculate the acceleration of this car. Use the Physics Equations Sheet. [3 marks] Acceleration = mis? 9 AMM G/Jun24/8465/3H 8 10 Do not write outside the box [0 [3]-[2] The reaction between citric acid and sodium hydrogen carbonate is endothermic. Which reaction profile represents an endothermic reaction? [1 mark] Tick (“) one box. Energy Lo Progress of reaction Energy Lo Progress of reaction Energy Lo Progress of reaction Energy _———— a Progress of reaction G/Jun24/8465/3H 10 11 Do not write outside the box [0 [3]-[3] Explain why the rate of reaction is greater when powder is used instead of larger lumps. Refer to surface area and collisions in your answer. [2 marks] 9 Turn over for the next question Turn over > IMI G/Jun24/8465/3H 11 13 Do not write outside the box [0 [4].[2] Evaluate the environmental impact of producing shirt A compared with producing shirt B. Use Table 2. Use calculations in your answer. [4 marks] [0 [4].[3] Peer reviews are used to check LCAs. Why should an independent scientist be used to peer review an LCA? [1 mark] Question 4 continues on the next page Turn over > 13 G/Jun24/8465/3H 13 14 Do not write outside the [0 [4].[4] Some LCAs assess the environmental impact of metal extraction. Name the biological methods of metal extraction that use: e bacteria e plants. [2 marks] Bacteria Plants 8 G/Jun24/8465/3H 14 16 Do not write outside the box -[3] Figure 4 shows a transformer. Figure 4 Primary coil Secondary coil —— ad From power cables if [> To consumers |——_ —— p__ eo The potential difference across the primary coil is 345 kV. The potential difference across the secondary coil is 230 V. The current in the primary coil is 0.060 A. Calculate the current in the secondary coil. Use the Physics Equations Sheet. [4 marks] Current = A IMI G/Jun24/8465/3H 16 17 Do not write outside the box -[4] Nuclear power stations and coal power stations have an environmental impact. Compare the environmental impact of generating electricity using these two types of power station. [4 marks] 14 Turn over for the next question Turn over > G/Jun24/8465/3H 17 19 Do not write outside the box [0 [6 ]-[4] Fluorine is an element in Group 7. Complete Figure 5 to represent the electronic structure of fluorine. [1 mark] Figure 5 -[5] Which is a correct statement about the elements in Group 7? [1 mark] Tick (Vv) one box. The elements in Group 7 consist of single, non-bonded atoms. The elements in Group 7 react with non-metals to form covalent compounds. The melting points of the elements in Group 7 decrease going down the group. The reactivity of the elements in Group 7 increases going down the group. Question 6 continues on the next page Turn over > IMI 9 G/Jun24/8465/3H 19 20 Do not write outside the The elements in Group 1 react with water. box [0 [6 ]-[6] Give two observations you would see when a small piece of lithium is added to water. [2 marks] 1 2 ‘i Lithium reacts with water less vigorously than sodium reacts with water. Explain why lithium is less reactive than sodium. [3 marks] IMU G/Jun24/8465/3H 20 
