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Do not write in the barcodes. |  |  |  |\n| --- | --- | --- | --- |\n| Centre number |  | Candidate number |  |\n| First name(s)  \u003Cbr>Last name   |  |  |  |\n\nINSTRUCTIONS  \n• Use black ink. You can use an HB pencil, but only for graphs and diagrams.  \n• Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown.  \n• Answer all the questions.  \n• Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong.  \nINFORMATION  \n• The total mark for this paper is 90.  \n• The marks for each question are shown in brackets [ ] .  \n• Quality of extended response will be assessed in questions marked with an asterisk (*) .  \n• This document has 28 pages.  \nADVICE  \n• Read each question carefully before you start your answer.  \n© OCR 2024 [601/8663/X] DC (ST/CB) 335830/7  \nOCR is an exempt Charity  \nTurn over  \n2  \nSection A  \nYou should spend a maximum of 30 minutes on this section.  \nWrite your answer to each question in the box provided.  \n1 Which substance is an unsaturated hydrocarbon?  \nA CH4  \nB C2 H6  \nC C3 H6  \nD C3 H8  \nYour answer  [1]  \n2 What happens when liquid bromine, Br2 , boils?  \nA Covalent bonds break  \nB Electrostatic forces break  \nC Intermolecular forces break  \nD Ionic bonds break  \nYour answer  [1]  \n3 What is a life-cycle assessment?  \nA Analysis of the cost of making, using, and disposing of a product.  \nB Analysis of the energy needed to use a product throughout its lifetime.  \nC Analysis of the potential environmental impact of manufacturing a product.  \nD Analysis of the potential environmental impact that a product may have throughout its lifetime.  \nYour answer  [1]  \n3  \n4 Which of these is one of the four nucleotides in the polymer DNA?  \nA Cytosine  \nB Deoxyribose  \nC Fructose  \nD Phosphate  \nYour answer  [1]  \n5 Polyesters are condensation polymers.  \nWhich monomers are polyesters made from?  \nA A carboxylic acid and an ester  \nB An alcohol and a carboxylic acid  \nC An alcohol and an amine  \nD An amine and a carboxylic acid  \nYour answer  [1]  \n6 Nitrogen and oxygen react together at high temperatures in car engines.  \nNitrogen monoxide is made.  \nWhat is the balanced equation for the reaction?  \nA N + O  NO  \nB N + O2  NO2  \nC N2 + O2  2NO  \nD 2N2 + O2  2N2O  \nYour answer  [1]  \n© OCR 2024 Turn over  \n4  \n7 What is an advantage of extracting metals by phytoextraction?  \nA It can extract metals from contaminated soils.  \nB It is dependent on weather conditions.  \nC It is slow.  \nD It produces carbon dioxide gas when the plants are burnt.  \nYour answer  [1]  \n8 What is the average rate of this reaction, in cm3 / s, during the first 5 seconds?  \nVolume of gas (cm3 )  \n20 ~~ ~~  \n15 ~~  ~~  \n10 ~~  ~~  \n5 ~~  ~~  \n0 ~~ ~~~~ ~~~~ ~~~~ ~~~~ ~~~~ ~~ 0 5 10 15 20 25  \nTime (s)  \nA 0.5 cm3 / s B 2.0 cm3 / s C 5.0 cm3 / s D 50.0 cm3 / s  \nYour answer  \n[1]  \n5  \n9 How is the mass of a solute, in g, related to the concentration of the solution, in g / dm3 , and the volume of the solution, in dm3?  \nA mass = concentration × volume  \nB mass = concentration × volume  \n1000  \nC mass =  concentration  \nvolume  \nD  volume   \nmass = concentration  \nYour answer  [1]  \n10 Which equation shows the reaction at the anode in a hydrogen/oxygen fuel cell?  \nA H2(g)  2H+(aq) + 2e–  \nB 4H+(aq) + O2(g) + 4e–  2H2O(g)  \nC 2H2(g) + O2(g)  2H2O(g)  \nD O2(g) + 4e–  2O2–(g)  \nYour answer  [1]  \n11 The polymer nylon can be made from hexanedioyl dichloride, Cl","cbCaigtad8dELVCq","https://ap.wps.com/l/cbCaigtad8dELVCq","pdf",5981769,28,"English","# Section A\n## 1-15\n# Section B\n## 16(a)","[{\"question\":\"What is the total mark and time allowance for this paper?\",\"answer\":\"The total mark is 90, and the time allowed is 1 hour 45 minutes.\"},{\"question\":\"What equipment is required or allowed for answering?\",\"answer\":\"You must have a ruler (cm/mm) and the GCSE (9–1) Chemistry A data sheet. You can use a scientific or graphical calculator and an HB pencil (only for graphs and diagrams).\"},{\"question\":\"How are answers marked for method or extended responses?\",\"answer\":\"Marks may be awarded for using a correct method even if the final answer is wrong, and quality of extended response is assessed for questions marked with an asterisk.\"}]","GCSE (9–1) Chemistry A (Gateway Science) J248/04 - Higher Tier - Question Paper (OCR) | PDF",71]