[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-208082-en":3,"doc-seo-208082-105":30,"detail-sidebar-cat-0-en-105":90},{"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":4,"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},208082,2336474466712,"Quinn Holloway","https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd",4,"Exam","CCEA GCSE Double Award Science Biology Factfile - Unit 1.3 Food tests","CCEA GCSE Biology Unit 1.3 Food tests covers learning outcomes for identifying positive results from key biochemical reagents used on food samples. It explains colour changes and observable outcomes for Benedict’s solution, iodine solution, Biuret and ethanol, and links each test to reducing sugars, starch, protein/amino acids and lipids (fats). The unit also outlines the importance of carbohydrates, fats/lipids and proteins, and includes a practical on determining energy content by burning food samples.","FACTFILE:  \nGCSE  \nDAS BIOLOGY UNIT 1.3  \n Food Tests   \nLearning Outcomes  \n1.3.1 recall the colour changes for the following reagents, Benedicts, iodine solution, Biuret and ethanol.  \n\n| Reagent | Initial Colour | End colour for\u003Cbr>positive test |\n| --- | --- | --- |\n| Benedicts | Blue | Brick red\u003Cbr>precipitate |\n| Iodine solution | Yellow-brown | Blue-black |\n| Biuret | Blue | Lilac-purple |\n| Ethanol | Colourless | White emulsion |\n\n1.3.2 investigate food samples using food tests, including:  \n• reducing sugar (Benedict’s);  \n• starch (iodine solution);  \n• amino acid or protein (Biuret); and  \n• fats (ethanol) .  \n1.3.3 explain the importance of the following biological molecules:  \n• carbohydrates, made up of simple carbohydrates (sugars, glucose and lactose) as sources of energy and storage, complex carbohydrates (cellulose, starch and glycogen);  \n• fats/lipids, including oils, made up of fatty acids and glycerol, as sources of energy and storage;  \n• proteins, made up of amino acids, as structural and functional molecules in cells;  \nPractical 1.3 investigate the energy content of food by burning food samples.  \nFood tests  \nWhen testing samples of food for the food groups they contain, scientists use a range of biochemical tests. The solutions added to the samples are called reagents. Reagents are substances that cause a chemical reaction when they are added to the sample. The chemical reaction usually causes a visible colour change or the formation of a precipitate or emulsion. In this unit you need to be able to identify the positive result seen when food is tested for reducing sugars, starch, protein/amino acids and lipids (fats) .  \nTesting for reducing sugars using Benedict’s solution.  \nStep one: Place a sample of the food into a boiling tube with some water and add a few drops of Benedict’s solution.  \nBenedict’s solution  \nWater  \nFood sample  \nFigure 1  \nFACTFILE: GCSE BIOLOGY : CELLS, LIVING PROCESSES AND BIODIVERSITY  \nStep two: Place the boiling tube into a water bathand heat.  \nFood sample and Benedict’s solution  \nFood sample and Benedict’s solution  \nFigure 3  \nResult: A colour change from blue to green toorange to brick red will occur depending on the amount of sugar present. Reducing sugars include glucose and lactose.  \nTesting for starch using iodine solution  \nStep One: Add a few drops of iodine solution to the food sample.  \nWater   \nFood sample ~~ ~~  \nIodine solution  \nFigure 4  \nFood sample ~~ ~~  \nFigure 5  \nResult: the iodine turns from yellow/brown to blue/ black if starch is present.  \nTesting for protein/amino acids using Biuret  \n*Note: Biuret is a solution of sodium hydroxide and copper sulphate  \nStep one: Add a few drops of Biuret to the food sample and shake.  \nWater  \nFood sample  \nBiuret solution  \nFigure 6  \nWater   \nFood sample   \nFigure 7  \nResult: The biuret turns from blue to purple  \nTesting for lipids using ethanol  \nStep one: Add the ethanol to the food sample and mix  \nFood sample  \nEthanol  \nFigure 8  \nFood sample ~~ ~~  \nFigure 9  \n\n|  |\n| --- |\n| |\n\n2  \nFACTFILE: GCSE BIOLOGY : CELLS, LIVING PROCESSES AND BIODIVERSITY  \nResult: the ethanol turns from clear to form a white emulsion.  \nFind the nutrition and food words in the word search  \nSource: generated using [http://www.word-search](http://www.word-search)[world.griddler.co.uk/Word-Search-Generator.aspx](world.griddler.co.uk/Word-Search-Generator.aspx)  \namino acid benedictsbiuret carbohydrates cellulose  \nenergy ethanol fat glucose  \nglycogen iodine lactose lipids nutrition protein starch  \n1. The table shows the results of food tests carried out on a biscuit.  \n\n| Test reagent | Reagent\u003Cbr>colour at\u003Cbr>start | Result of food\u003Cbr>test |\n| --- | --- | --- |\n| Benedict’s | Blue | Positive |\n| Ethanol | Clear | Positive |\n| Biuret | Blue | Negative |\n| Iodine | Yellow-brown | Positive |\n\nLook at the table  \nUse the information in the table to draw conclusions about the types of food in the biscuit.  \nDescribe the colo","cbCail5r827AoKYb","https://ap.wps.com/l/cbCail5r827AoKYb","pdf",1070619,1,6,"English","en",105,"# Learning Outcomes\n## 1.3.1 Reagent colour changes\n## 1.3.2 Food tests for key nutrients\n## 1.3.3 Importance of biological molecules\n## Practical 1.3 Energy content of food\n# Food tests procedures\n## Testing for reducing sugars (Benedict’s)\n## Testing for starch (iodine solution)\n## Testing for protein/amino acids (Biuret)\n## Testing for lipids (ethanol)","[{\"question\":\"What colour changes indicate a positive test for reducing sugars using Benedict’s solution?\",\"answer\":\"A blue to green to orange to brick red colour change occurs depending on the amount of sugar present. Reducing sugars include glucose and lactose.\"},{\"question\":\"How does iodine solution show a positive test for starch?\",\"answer\":\"Iodine turns from yellow/brown to blue/black if starch is present.\"},{\"question\":\"What is the positive result when Biuret is used to test for protein or amino acids?\",\"answer\":\"Biuret turns from blue to purple when protein/amino acids are present.\"}]","CCEA GCSE Double Award Science Biology Factfile - Unit 1.3 Food tests | PDF",1788602377,15,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"ccea-gcse-double-award-science-biology-factfile-unit-13-food-tests","",{"@graph":36,"@context":84},[37,53,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/ccea-gcse-double-award-science-biology-factfile-unit-13-food-tests/208082/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"What colour changes indicate a positive test for reducing sugars using Benedict’s solution?","Question",{"text":74,"@type":75},"A blue to green to orange to brick red colour change occurs depending on the amount of sugar present. Reducing sugars include glucose and lactose.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How does iodine solution show a positive test for starch?",{"text":79,"@type":75},"Iodine turns from yellow/brown to blue/black if starch is present.",{"name":81,"@type":72,"acceptedAnswer":82},"What is the positive result when Biuret is used to test for protein or amino acids?",{"text":83,"@type":75},"Biuret turns from blue to purple when protein/amino acids are present.","https://schema.org",{"og:url":52,"og:type":86,"og:title":13,"og:site_name":58,"og:description":14},"article",{"robots":88,"canonical":52},"index,follow",{"doc_id":7,"site_id":24},{"code":4,"msg":5,"data":91},[92,96,100,103,108,112,117,122,127,130,134],{"id":20,"doc_module":4,"doc_module_name":46,"category_name":93,"show_sort_weight":94,"slug":95},"Story & Novel",90,"story-novel",{"id":47,"doc_module":4,"doc_module_name":46,"category_name":97,"show_sort_weight":98,"slug":99},"Literature",80,"literature",{"id":11,"doc_module":4,"doc_module_name":46,"category_name":12,"show_sort_weight":101,"slug":102},70,"exam",{"id":104,"doc_module":4,"doc_module_name":46,"category_name":105,"show_sort_weight":106,"slug":107},5,"Comic",60,"comic",{"id":21,"doc_module":4,"doc_module_name":46,"category_name":109,"show_sort_weight":110,"slug":111},"Technology",50,"technology",{"id":113,"doc_module":4,"doc_module_name":46,"category_name":114,"show_sort_weight":115,"slug":116},7,"Healthcare",40,"healthcare",{"id":118,"doc_module":4,"doc_module_name":46,"category_name":119,"show_sort_weight":120,"slug":121},8,"Research & Report",30,"research-report",{"id":123,"doc_module":4,"doc_module_name":46,"category_name":124,"show_sort_weight":125,"slug":126},9,"Religion & Spirituality",20,"religion-spirituality",{"id":125,"doc_module":4,"doc_module_name":46,"category_name":128,"show_sort_weight":125,"slug":129},"World Cup","world-cup",{"id":131,"doc_module":4,"doc_module_name":46,"category_name":132,"show_sort_weight":131,"slug":133},10,"Lifestyle","lifestyle",{"id":135,"doc_module":4,"doc_module_name":46,"category_name":136,"show_sort_weight":104,"slug":137},19,"General","general"]