[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-207392-105":59,"doc-detail-207392-en":124},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":117,"head_meta":119,"extra_data":121,"updated_unix":123},105,"en","aqa-gcse-chemistry-exothermic-endothermic-reactions","AQA GCSE Chemistry - Exothermic & Endothermic Reactions","","AQA GCSE Chemistry revision notes explaining how energy is transferred during chemical reactions, linking heat exchange to temperature change and the law of conservation of energy. The notes define exothermic reactions as releasing heat energy and raising temperature, while endothermic reactions take in heat energy and lower temperature. It also summarizes measuring heat changes and provides an assessed required practical to investigate temperature changes using HCl and NaOH via calorimetry, including method, expected observations, data handling, graphing, and evaluation.",{"@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-chemistry-exothermic-endothermic-reactions/207392/",{"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},"Emma Wilson","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 does the law of conservation of energy mean for chemical reactions?","Question",{"text":106,"@type":107},"Energy is conserved, so the overall amount of energy does not change. It can only be transferred, meaning products gain or lose energy by the same amount as transferred to or from the surroundings.","Answer",{"name":109,"@type":104,"acceptedAnswer":110},"How can you tell whether a reaction is exothermic or endothermic from temperature changes?",{"text":111,"@type":107},"Use the temperature change of the surroundings. If the surroundings’ temperature increases, the reaction is exothermic; if it decreases, the reaction is endothermic.",{"name":113,"@type":104,"acceptedAnswer":114},"What is the purpose of the required practical investigating temperature changes?",{"text":115,"@type":107},"To perform a calorimetry study of the reaction between HCl and NaOH and determine how the temperature change varies with different amounts of solutions, using thermometer measurements and graphing results.","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},207392,1788599379,{"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":36},3848291630094,"https://eur-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","Head to www.savemyexams. com for more awesome resources  \n AQA GCSE Chemistry  \nExothermic & Endothermic Reactions  \nContents  \n Energy Transfer in Reactions  \n Required Practical: Investigating Temperature Changes  \n Reaction Pro|les  \n The Energy Change of Reactions  \nPage 1 of 16  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nEnergy Transfer in Reactions  \nHeat exchange in reactions  \n The changes in heat content can be determined and measured with a thermometer  \n Note that the overall amount of energy does not change as energy is conserved in reactions  \n This is known asthe law of conservation of energy  \n This means that it cannot be created or destroyed but it can be transferred  \n So, if energy is transferred to the surroundings during a chemical reaction, then the products formed must have less energy than the reactants by the same amount as that transferred  \n Examiner Tip  \nPhysical processes can also involve heat exchange. Examples include freezing or melting which involve a change in state.  \nPage 2 of 16  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nExothermic reactions  \nWhat isan exothermic reaction?  \n An exothermic reaction releases heat energy  \n This means that the temperature increases  \n Examples of exothermic reactions include neutralisation and combustion Exothermic reaction diagram  \nDiagram showing the transfer of heat energy outwards from an exothermic reaction  \nPage 3 of 16  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nEndothermic reactions  \nWhat isan endothermic reaction?  \n An endothermic reaction takes heat energy in  \n This means that the temperature decreases  \n Electrolysis, thermal decomposition reactions, the |rst stages of photosynthesis and the reaction between citric acid and sodium hydrogencarbonate are typical endothermic reactions  \n Sports injury treatment often use cold packs based on endothermic reactions to take heat away from a recently injured area to prevent swelling  \nEndothermic reaction diagram  \nDiagram showing the transfer of heat energy from the surroundings into an endothermic reaction  \nPage 4 of 16  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, Past Papers  \nYour notes  \nHead to www.savemyexams. com for more awesome resources  \nExothermic & endothermic reactions Measuring heat changes  \n The changes in heat content can be determined and measured with a thermometer  \n Note that the overall amount of energy does not change as energy is conserved in reactions  \n This means that it cannot be created or destroyed but it can be transferred  \n So, if energy is transferred to the surroundings during a chemical reaction, then the products formed must have less energy than the reactants by the same amount as that transferred  \nExamples of heat changes in reactions  \n Neutralisation reactions:  \n These always give energy out  \n Displacement reactions:  \n These can either take energy in or give it out  \n Combustion reactions:  \n These always give energy out  \n In summary:  \n In exothermic reactions, the temperature of the surroundings increases and the heat content of the system falls  \n In endothermic reactions, the temperature of the surroundings falls and the heat content of the system increases  \n Examiner Tip  \nYou may be asked to deduce whether a reaction is exothermic or endothermic given experimental results involving temperature changes. This may be for a reaction or experiment that you are unfamiliar with but the principle is still the same. Use the temperature change of the surroundings to decide whether it is exothermic or endothermic.  \nPage 5 of 16  \n© 2015 − 2024 Save My Exams, Ltd. · Revision Notes, Topic Questions, ","cbCaikRIzluYy4bM","https://ap.wps.com/l/cbCaikRIzluYy4bM","pdf",1199444,16,"English","# Energy Transfer in Reactions\n## Heat exchange in reactions\n## Required Practical: Investigating Temperature Changes\n# Exothermic reactions\n# Endothermic reactions\n# Measuring heat changes","[{\"question\":\"What does the law of conservation of energy mean for chemical reactions?\",\"answer\":\"Energy is conserved, so the overall amount of energy does not change. It can only be transferred, meaning products gain or lose energy by the same amount as transferred to or from the surroundings.\"},{\"question\":\"How can you tell whether a reaction is exothermic or endothermic from temperature changes?\",\"answer\":\"Use the temperature change of the surroundings. If the surroundings’ temperature increases, the reaction is exothermic; if it decreases, the reaction is endothermic.\"},{\"question\":\"What is the purpose of the required practical investigating temperature changes?\",\"answer\":\"To perform a calorimetry study of the reaction between HCl and NaOH and determine how the temperature change varies with different amounts of solutions, using thermometer measurements and graphing results.\"}]","AQA GCSE Chemistry - Exothermic & Endothermic Reactions | PDF"]