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The assessment uses a total of 90 marks and includes 32 pages with Section A requiring answers to questions in provided boxes, supported working where appropriate, and extended response questions marked with an asterisk. Topics covered include hydrogen peroxide decomposition, atom economy, fractional distillation intermolecular forces, alloy properties, enzymes as catalysts, functional groups in glycine, Haber and Contact process calculations, polymerisation, and reaction pathway choice, with standard exam instructions on equipment and ink.",{"@graph":69,"@context":116},[70,84,99],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/oxford-cambridge-and-rsa-gcse-91-chemistry-a-paper-4-higher-tier/207386/",{"url":83,"name":65,"@type":85,"author":86,"headline":65,"publisher":89,"fileFormat":92,"inLanguage":63,"description":67,"dateModified":93,"datePublished":93,"encodingFormat":92,"isAccessibleForFree":94,"interactionStatistic":95},"DigitalDocument",{"name":87,"@type":88},"Mimi","Person",{"url":74,"name":90,"@type":91},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":96,"interactionType":97,"userInteractionCount":4},"InteractionCounter",{"@type":98},"ViewAction",{"@type":100,"mainEntity":101},"FAQPage",[102,108,112],{"name":103,"@type":104,"acceptedAnswer":105},"What equipment is required for this Chemistry paper?","Question",{"text":106,"@type":107},"A ruler (cm/mm) is required, and the Data Sheet for GCSE (9–1) Chemistry A is included inside the document. 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Where appropriate, include working because marks may be awarded for a correct method even if the final answer is incorrect.","https://schema.org",{"og:url":83,"og:type":118,"og:title":65,"og:site_name":90,"og:description":67},"article",{"robots":120,"canonical":83},"index,follow",{"doc_id":122,"site_id":62},207386,1788599365,{"code":4,"msg":5,"data":125},{"doc_id":122,"user_id":126,"nickname":87,"user_avatar":127,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":128,"file_id":129,"file_url":130,"file_type":131,"file_size":132,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":133,"language":134,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":135,"faqs":136,"seo_title":137,"seo_description":67,"update_tm":123,"read_time":138},2336477974920,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Oxford Cambridge and RSA  \nFriday 20 November 2020 – Morning GCSE (9–1) Chemistry A (Gateway Science) J248/04 Paper 4 (Higher Tier)  \nTime allowed: 1 hour 45 minutes  \nH  \nYou must have:  \n• a ruler (cm/mm)  \n• the Data Sheet for GCSE (9–1) Chemistry A (inside this document)  \nYou can use:  \n• a scientific or graphical calculator  \n• an HB pencil  \n| Please write clearly in black ink. 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 a correct method, even if the 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 32 pages.  \nADVICE  \n• Read each question carefully before you start your answer.  \n© OCR 2020 [601/8663/X] DC (ST/JG) 191515/7  \nOCR is an exempt Charity  \nTurn over  \n2  \nSECTION A  \nAnswer all the questions.  \nYou should spend a maximum of 30 minutes on this section.  \nWrite your answer to each question in the box provided.  \n1 A student investigates the decomposition of hydrogen peroxide.  \n2H2O2(aq)  2H2O(l) + O2(g)  \n0.2 g of oxygen gas is produced in the reaction.  \nThe student uses 0.5 g of manganese(IV) oxide as a catalyst in the reaction. How much manganese(IV) oxide remains at the end of the reaction?  \nA  \nB  \nC  \nD  \n0.2 g  \n0.3 g  \n0.5 g  \n0.7 g  \nYour answer  [1]  \n2 Hydrogen gas, H2 , reacts with oxygen gas, O2 , to make water, H2O.  \n2H2 + O2  2H2O  \nWhat is the atom economy for this reaction?  \nMr: H2 = 2, O2 = 32, H2O = 18  \nA 50%  \nB 53%  \nC 89%  \nD 100%  \nYour answer  \n[1]  \n3  \n3 Crude oil is separated into fractions by fractional distillation.  \nLook at the diagram of the fractions made in fractional distillation.  \nFractions  \nGases  \nCrude oil  \nPetrol  \nKerosene Diesel oil Fuel oil  \n~~ ~~ Bitumen  \nWhich of these fractions has the strongest intermolecular forces?  \nA Bitumen  \nB Diesel oil  \nC Gases  \nD Kerosene  \nYour answer [1]  \n4 What is the general formula of the fractions produced by the fractional distillation of crude oil?  \nA C H  \nn 2n  \nB CnH2n+2  \nC C2 H2n+1OH  \nD C2n+2 H2  \nYour answer [1]  \n© OCR 2020 Turn over  \n4  \n5 The table shows some information about four alloys.  \n\n|  | Alloy | Main metals | Typical Uses |\n| --- | --- | --- | --- |\n| A | brass | copper and tin | musical instruments |\n| B | bronze | copper and zinc | bells |\n| C | duralumin | aluminium and copper | aircraft parts |\n| D | solder | iron and tin | bridges |\n\nWhich row of the table gives correct information about an alloy?  \nYour answer  [1]  \n6 Enzymes are a type of catalyst.  \nWhich of the following catalysts is an example of an enzyme?  \nA Amylase – a catalyst found in human saliva.  \nB Iron – a catalyst used in the Haber process.  \nC Manganese(IV) oxide – a catalyst used in the decomposition of hydrogen peroxide.  \nD Vanadium(V) oxide – a catalyst used in the Contact process.  \nYour answer  \n[1]  \n5  \n7 Look at the structure of glycine.  \nH  \nH  O  \nN ~~ ~~ C ~~ ~~ C  \nH  OH  \nH  \nGlycine is a monomer that reacts to form proteins.  \nGlycine contains two different functional groups that allow it to undergo polymerisation.  \nWhat are the two functional groups?  \nA −NH2 and −C=O  \nB −NH2 and −CH2 −  \nC −NH2 and −OH  \nD −NH2 and −COOH  \nYour answer  [1]  \n8 In the Haber process, nitrogen reacts with hydrogen to make ammonia.  \nN2(g) + 3H2(g)  2NH3(g)  \nWhat is the maximum volume of ammonia, NH3 , that can be made from 150 cm3 ","cbCairamUxoowmLv","https://ap.wps.com/l/cbCairamUxoowmLv","pdf",3589305,32,"English","# Section A\n## Answer all the questions\n## Quality of extended response","[{\"question\":\"What equipment is required for this Chemistry paper?\",\"answer\":\"A ruler (cm/mm) is required, and the Data Sheet for GCSE (9–1) Chemistry A is included inside the document. A scientific or graphical calculator and an HB pencil may be used, with the HB pencil limited to graphs and diagrams.\"},{\"question\":\"How many marks and how much time are allocated for the paper?\",\"answer\":\"The total mark for the paper is 90. You should spend a maximum of 30 minutes on Section A.\"},{\"question\":\"How should answers be presented to receive marks if the final answer is wrong?\",\"answer\":\"Answers should be written in black ink. Where appropriate, include working because marks may be awarded for a correct method even if the final answer is incorrect.\"}]","Oxford Cambridge and RSA GCSE (9–1) Chemistry A - Paper 4 (Higher Tier) | PDF",81]