[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207968-en":3,"doc-seo-207968-105":30,"detail-sidebar-cat-0-en-105":81},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207968,962084928432,"Maya Linwood","https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d",4,"Exam","summer-2019-question2","Aluminium extraction and recycling exam questions covering an electrolysis cell diagram and the extraction of aluminium from alumina. Tasks include completing sentence blanks about electrolyte composition, electrode roles, product formation, and ore source, balancing an overall reaction equation, calculating the percentage of alumina in an aluminium ore sample, and interpreting an energy comparison chart to identify the reason recycling aluminium is more cost effective than recycling steel and copper.","6  \n2. The diagram shows an electrolysis cell used in the extraction of aluminium from alumina.  \nanode  \n cathode  \nmolten electrolyte  \nbauxite electrical molten alumina positive  \nnegative cryolite molten aluminium oxygen light  \n(a) Choose words from the box to complete the following sentences. [5]  \nThe molten electrolyte is a mixture of alumina and ................................................................................  \nProduct A is ................................................................................  \nOxygen is formed at the anode which is the ............................................................................... electrode.  \nAlumina is obtained from an ore called ................................................................................  \nThe process of extracting aluminium is expensive because it uses a lot of  \n............................................................................... energy.  \n(b) Balance the symbol equation that shows the overall reaction. [1]  \n2Al2O3  Al + 3O2  \nExaminer  \nonly  \n© WJEC CBAC Ltd.  \n(3410U20-1)  \n7  \n\n| (c) 250 tonnes of an aluminium ore can produce 195 tonnes of alumina. Calculate the percentage of alumina in the ore. [2]\u003Cbr>Percentage = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . %\u003Cbr>(d) The chart compares the amount of energy used to extract and to recycle three metals. |  |  |\n| --- | --- | --- |\n| Energy (kWh) | 70\u003Cbr>60\u003Cbr>50\u003Cbr>40\u003Cbr>30\u003Cbr>20\u003Cbr>10\u003Cbr>0\u003Cbr>~~ ~~ energy used to extract metal ore energy used to \u003Cbr>\u003Cbr>\u003Cbr>\u003Cbr>from its\u003Cbr>recycle metal\u003Cbr>steel aluminium copper |  |\n| Use the information in the chart to answer the following question.\u003Cbr>Put a tick (√) in the box next to the statement that describes why it is more cost effective\u003Cbr>to recycle aluminium than steel and copper. [1] |  |  |\n| The energy used to extract metals is greater than that used in recycling them\u003Cbr>The difference between the energy used to extract and the energy used torecycle is the greatest\u003Cbr>The energy used in recycling is less than for copper but greater than for steel |  | |\n\n© WJEC CBAC Ltd. (3410U20-1) Turn over.  \nExaminer  \nonly  \n3 41 0 U 2 0 1 07  \n\n|  |\n| --- |\n| 9 |","cbCaisuiCfljLP8A","https://ap.wps.com/l/cbCaisuiCfljLP8A","pdf",168344,1,2,"English","en",105,"# Aluminium extraction questions\n## Electrolysis diagram completion\n## Balance the overall reaction equation\n## Calculate percentage of alumina in ore\n## Interpret energy chart for recycling","[{\"question\":\"How do you decide why recycling aluminium is more cost effective than recycling steel and copper?\",\"answer\":\"Use the energy comparison chart and tick the statement that correctly explains the relative energy used for extraction versus recycling for the three metals.\"}]","summer-2019-question2 | PDF",1788601935,5,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":13,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":76,"head_meta":78,"extra_data":80,"updated_unix":28},"",{"@graph":35,"@context":75},[36,51,66],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,46,49],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":21},"https://docshare.wps.com/document/","Document",{"item":47,"name":12,"@type":42,"position":48},"https://docshare.wps.com/document/exam/",3,{"item":50,"name":13,"@type":42,"position":11},"https://docshare.wps.com/document/summer-2019-question2/207968/",{"url":50,"name":13,"@type":52,"author":53,"headline":13,"publisher":55,"fileFormat":58,"inLanguage":23,"description":14,"dateModified":59,"datePublished":60,"encodingFormat":58,"isAccessibleForFree":61,"interactionStatistic":62},"DigitalDocument",{"name":9,"@type":54},"Person",{"url":40,"name":56,"@type":57},"DocShare","Organization","application/pdf","2026-09-06","2026-09-05",true,{"@type":63,"interactionType":64,"userInteractionCount":20},"InteractionCounter",{"@type":65},"ViewAction",{"@type":67,"mainEntity":68},"FAQPage",[69],{"name":70,"@type":71,"acceptedAnswer":72},"How do you decide why recycling aluminium is more cost effective than recycling steel and copper?","Question",{"text":73,"@type":74},"Use the energy comparison chart and tick the statement that correctly explains the relative energy used for extraction versus recycling for the three metals.","Answer","https://schema.org",{"og:url":50,"og:type":77,"og:title":13,"og:site_name":56,"og:description":14},"article",{"robots":79,"canonical":50},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":82},[83,87,91,94,98,103,108,113,118,121,125],{"id":20,"doc_module":4,"doc_module_name":45,"category_name":84,"show_sort_weight":85,"slug":86},"Story & Novel",90,"story-novel",{"id":21,"doc_module":4,"doc_module_name":45,"category_name":88,"show_sort_weight":89,"slug":90},"Literature",80,"literature",{"id":11,"doc_module":4,"doc_module_name":45,"category_name":12,"show_sort_weight":92,"slug":93},70,"exam",{"id":29,"doc_module":4,"doc_module_name":45,"category_name":95,"show_sort_weight":96,"slug":97},"Comic",60,"comic",{"id":99,"doc_module":4,"doc_module_name":45,"category_name":100,"show_sort_weight":101,"slug":102},6,"Technology",50,"technology",{"id":104,"doc_module":4,"doc_module_name":45,"category_name":105,"show_sort_weight":106,"slug":107},7,"Healthcare",40,"healthcare",{"id":109,"doc_module":4,"doc_module_name":45,"category_name":110,"show_sort_weight":111,"slug":112},8,"Research & Report",30,"research-report",{"id":114,"doc_module":4,"doc_module_name":45,"category_name":115,"show_sort_weight":116,"slug":117},9,"Religion & Spirituality",20,"religion-spirituality",{"id":116,"doc_module":4,"doc_module_name":45,"category_name":119,"show_sort_weight":116,"slug":120},"World Cup","world-cup",{"id":122,"doc_module":4,"doc_module_name":45,"category_name":123,"show_sort_weight":122,"slug":124},10,"Lifestyle","lifestyle",{"id":126,"doc_module":4,"doc_module_name":45,"category_name":127,"show_sort_weight":29,"slug":128},19,"General","general"]