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Focus areas include gases and the carbon cycle, greenhouse gas effects, and reducing carbon dioxide emissions, alongside fuel chemistry and separation of mixtures using distillation and related ideas. Water treatment is also tested, requiring knowledge of ions and standard identification methods, with mark schemes guiding clear, logical presentation.",{"@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/aqa-gcse-combined-science-trilogy-chemistry-foundation-tier-paper-4-specimen-2018/207378/",{"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},"McGucket","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 topics are covered in this chemistry specimen paper?","Question",{"text":106,"@type":107},"It covers gases and Earth’s atmosphere, the carbon dioxide greenhouse effect and mitigation, separation and analysis of fuels, and drinking water treatment including dissolved ions.","Answer",{"name":109,"@type":104,"acceptedAnswer":110},"Which separation method is tested in Question 2.2?",{"text":111,"@type":107},"Students choose from crystallisation, electrolysis, filtration, or distillation to identify the method used to separate a fuel mixture.",{"name":113,"@type":104,"acceptedAnswer":114},"How is the mean melting point calculated in the paper?",{"text":115,"@type":107},"The mean melting point is calculated across four trials, with any anomalous result left out, and the final answer given to two significant figures.","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},207378,1788599347,{"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},1236954412713,"https://us-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","SPECIMEN MATERIAL  \nGCSE  \nCOMBINED SCIENCE: TRILOGY  \nFoundation Tier Paper 4: Chemistry 2F  \nF  \nSpecimen 2018 Time allowed: 1 hour 15 minutes  \nMaterials  \nFor this paper you must have:  \n• a ruler  \n• a calculator  \n• the periodic table (enclosed)  \nInstructions  \n• Answer all questions in the spaces provided.  \n• Do all rough work in this book. Cross through any work you do not want to be marked.  \nInformation  \n• There are 70 marks available on this paper.  \n• The marks for questions are shown in brackets.  \n• You are expected to use a calculator where appropriate.  \n• You are reminded of the need for good English and clear presentation in your answers.  \n• When answering questions 06.4 and 07.1 you need to make sure that your answer:  \n‒ is clear, logical, sensibly structured  \n‒ fully meets the requirements of the question  \n‒ shows that each separate point or step supports the overall answer.  \nAdvice  \n• In all calculations, show clearly how you work out your answer.  \n\n| Please write clearly, in block capitals. |  |  |  |  |\n| --- | --- | --- | --- | --- |\n| Centre number |  | | Candidate number | |\n| Surname\u003Cbr>Forename(s) | |  |  |  |\n| Candidate signature   |  |  |  |  |\n\n0  1  This question is about gases in the Earth’s atmosphere.  \n0  1  .  1  The amount of carbon dioxide in the Earth’s atmosphere decreased during the first billion years of the Earth’s existence.  \nComplete the sentences. Use words from the box.  \n[2 marks]  \ncarbonates dissolved evaporated melted nitrates sulfates  \nThe amount of carbon dioxide in the Earth’s atmosphere decreased because the carbon dioxide   in the oceans.  \nSediments were formed when   were produced.  \nAlgae and plants use carbon dioxide and water to produce oxygen.  \n0  1  .  2  What is the name of this process?  \n[1 mark]  \nTick one box.  \nCarbon capture Combustion Photosynthesis Polymerisation  \n0  1  .  3  Complete the word equation for this process.  \n[1 mark]  \ncarbon dioxide +     → glucose +      \nSPECIMEN MATERIAL  \n0  1  .  4   \nDraw one line from each gas to the approximate percentage of the gas in the Earth’s atmosphere today.  \n[3 marks]  \nCarbon dioxide is a greenhouse gas.  \nWhy does increasing the amount of carbon dioxide change the global climate?  \n[1 mark]  \nQuestion 1 continues on the next page  \n0  1  .  6   \n0  1  .  7   \nHow can countries reduce carbon dioxide emissions?  \n[1 mark]  \nTick one box.  \nonly burn methane use renewable energy supplies use waste plastic bags as fuel  \nGive one reason why it is difficult for countries to reduce emissions of carbon dioxide.  \n[1 mark]  \nSPECIMEN MATERIAL  \nTurn over for the next question  \n0  2  The apparatus in Figure 1 is used to separate a mixture of liquids in a fuel.  \nFigure 1  \n0  2  .  1  What is apparatus W on Figure 1?  \n[1 mark]  \nTick one box.  \nBeaker Boiling Tube Flask  \nJug  \nSPECIMEN MATERIAL  \n0  2  .  2  What is the name of this method of separation?  \n[1 mark]  \nTick one box.  \nCrystallisation Electrolysis Filtration Distillation  \n0  2  .  3  Name the changes of state taking place at A and B in Figure 1.  \nUse words from the box.  \n[2 marks]  \nboiling condensing freezing melting  \nChange of state at A:   Change of state at B:    \nQuestion 2 continues on the next page  \nTable 1 shows the boiling points of the hydrocarbons in the fuel.  \nTable 1  \n\n| Hydrocarbon | Boiling point in °C |\n| --- | --- |\n| Pentane | 36 |\n| Hexane | 69 |\n| Heptane | 98 |\n| Octane | 125 |\n\n0  2  .  4  Which hydrocarbon will be the last to collect in the beaker?  \nTick one box.  \nPentane Hexane  \nHeptane  \nOctane  \n[1 mark]  \n0  2  .  5  The fuel is a mixture of liquids that has been designed as a useful product.  \nWhat name is given to this type of mixture?  \n[1 mark]  \nTick one box.  \nCatalyst   \nFormulation   \nPolymer    \nSolvent   \nSPECIMEN MATERIAL  \n0  2  .  6  Describe how this fuel is different from crude oil.  \n[2 marks]  \n\n|  |\n| --- |\n|  |\n|  |\n\n0  2  .  7  A student measured the melting point of a solid h","cbCaihx5kjMYDDox","https://ap.wps.com/l/cbCaihx5kjMYDDox","pdf",431141,26,"English","# Question 1: Gases and the Earth’s atmosphere\n## 1.1 Carbon dioxide decrease and word completion\n## 1.2 Process name (tick box)\n## 1.3 Word equation completion\n## 1.4 Greenhouse gas and global climate\n## 1.6 Reducing carbon dioxide emissions\n## 1.7 Difficulty in reducing emissions\n# Question 2: Separating and analysing fuel\n## 2.1 Identify apparatus W\n## 2.2 Method of separation (tick box)\n## 2.3 Changes of state in the diagram\n## 2.4 Last hydrocarbon to collect\n## 2.5 Mixture type identification\n## 2.6 Difference from crude oil\n## 2.7 Mean melting point calculation\n# Question 3: Drinking water and dissolved ions\n## 3.1 Water treatment methods (tick boxes)\n## 3.2 Identify ion symbol Cl−","[{\"question\":\"What topics are covered in this chemistry specimen paper?\",\"answer\":\"It covers gases and Earth’s atmosphere, the carbon dioxide greenhouse effect and mitigation, separation and analysis of fuels, and drinking water treatment including dissolved ions.\"},{\"question\":\"Which separation method is tested in Question 2.2?\",\"answer\":\"Students choose from crystallisation, electrolysis, filtration, or distillation to identify the method used to separate a fuel mixture.\"},{\"question\":\"How is the mean melting point calculated in the paper?\",\"answer\":\"The mean melting point is calculated across four trials, with any anomalous result left out, and the final answer given to two significant figures.\"}]","AQA GCSE Combined Science: Trilogy Chemistry Foundation Tier Paper 4 - Specimen 2018 | PDF",66]