[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-656887-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-656887-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","energy-changes-exothermic-and-endothermic-reactions","Energy Changes - Exothermic and Endothermic Reactions","","Explains energy transfer in chemical reactions, focusing on exothermic and endothermic processes and how energy is released or absorbed during bond breaking and bond forming. Provides clear key points for each reaction type, including typical temperature changes and common everyday examples such as combustion, photosynthesis, hand warmers, fireworks, instant cold packs, and cooking. Introduces energy diagrams and reaction profiles, describing axes, reactants/products, and activation energy (Ea).",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/energy-changes-exothermic-and-endothermic-reactions/656887/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/energy-changes-exothermic-and-endothermic-reactions/656887.png","ImageObject",300,407,{"name":42,"@type":43},"Blitz","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-25",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",5,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is an exothermic reaction, and how does it affect the surroundings?","Question",{"text":63,"@type":64},"An exothermic reaction releases energy to its surroundings, usually as heat, light, or sound. Because energy is released, the temperature of the surroundings increases.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What is an endothermic reaction, and how does it affect the surroundings?",{"text":68,"@type":64},"An endothermic reaction absorbs energy from its surroundings. As energy is absorbed, the temperature of the surroundings decreases.",{"name":70,"@type":61,"acceptedAnswer":71},"How do energy diagrams for exothermic and endothermic reactions differ?",{"text":72,"@type":64},"In an exothermic energy diagram, reactants start at higher energy and products end at lower energy. In an endothermic diagram, reactants start lower and products end higher because energy is absorbed.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},656887,1793096361,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":102,"slug":103},6,50,"technology",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},7,"Healthcare",40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":55,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":101,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":127,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":144},24464137899374,"https://us-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","Energy Changes  \nL1 Exothermic and Endothermic reactions  \nChemical reactions are all around us, happening every day, whether it's the burning of fuel in a car engine or the process of photosynthesis in plants. One of the key concepts in chemistry is the transfer of energy during these reactions. Energy can either be released or absorbed during a chemical reaction. This brings us to two important types of reactions: exothermic and endothermic.  \nExothermic Reactions: Releasing Energy  \nAn exothermic reaction is a chemical reaction that releases energy to its surroundings, usually in the form of heat, light, or sound. This means that the energy of the products (the substances formed by the reaction) is lower than the energy of the reactants (the substances that react together) .  \nKey Points About Exothermic Reactions:  \n• Energy Release: During an exothermic reaction, energy is released because the total energy required to break the bonds in the reactants is less than the energy released when new bonds are formed in the products.  \n• Temperature Increase: Because energy is released, the temperature of the surroundings increases. You might feel the warmth if you touch the container where an exothermic reaction is taking place.  \n• Examples: Common examples include combustion (burning), such as burning wood or gasoline, and many oxidation reactions, like rusting of iron or the reaction between acids and metals.  \nExample Reaction: Combustion of Methane  \nCH4 + 2O2 → CO2 + 2H2O + energy  \nIn this reaction, methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O), releasing energy in the form of heat and light.  \nEndothermic Reactions: Absorbing Energy  \nAn endothermic reaction is the opposite of an exothermic reaction. It absorbs energy from its surroundings, which means that the energy of the products is higher than the energy of the reactants.  \nKey Points About Endothermic Reactions:  \n• Energy Absorption: During an endothermic reaction, energy is absorbed because the total energy required to break the bonds in the reactants is more than the energy released when new bonds are formed in the products.  \n• Temperature Decrease: Because energy is absorbed from the surroundings, the temperature of the surroundings decreases. You might feel a cooling effect if you touch the container where an endothermic reaction is taking place.  \n• Examples: Common examples include photosynthesis in plants, the melting of ice, and the reaction between barium hydroxide and ammonium chloride.  \nExample Reaction: Photosynthesis  \n6CO2 + 6H2O + energy → C6H12O6 + 6O2  \nIn this reaction, carbon dioxide (CO₂) and water (H₂O) react to form glucose (C₆ H₁₂O₆) and oxygen (O₂) . Energy from sunlight is absorbed during this process.  \nEnergy Diagrams: Visualizing Energy Changes  \nTo better understand how energy is transferred during these reactions, we can use energy diagrams.  \nExothermic Reaction Energy Diagram:  \n• Reactants at Higher Energy: The diagram starts with reactants at a higher energy level.  \n• Energy Release: As the reaction proceeds, energy is released to the surroundings.  \n• Products at Lower Energy: The products are at a lower energy level than the reactants.  \nEndothermic Reaction Energy Diagram:  \n• Reactants at Lower Energy: The diagram starts with reactants at a lower energy level.  \n• Energy Absorption: As the reaction proceeds, energy is absorbed from the surroundings.  \n• Products at Higher Energy: The products are at a higher energy level than the reactants.  \nEveryday Examples and Applications  \nUnderstanding exothermic and endothermic reactions helps us explain many everyday phenomena and has practical applications.  \nEveryday Exothermic Reactions:  \n• Hand Warmers: These use exothermic reactions to produce heat, keeping your hands warm in cold weather.  \n• Fireworks: The bright colors and loud sounds are the result of exothermic reactions.  \nEveryday Endothermic Reactions:  \n• Instant Cold Packs: The","cbCain0iyBIuYe3c","https://ap.wps.com/l/cbCain0iyBIuYe3c","pdf",368768,"English","# L1 Exothermic and Endothermic reactions\n## Exothermic Reactions: Releasing Energy\n## Endothermic Reactions: Absorbing Energy\n## Energy Diagrams: Visualizing Energy Changes\n## Everyday Examples and Applications\n# L2 Reaction profiles\n## What is a Reaction Profile?\n## Activation Energy (Ea)","[{\"question\":\"What is an exothermic reaction, and how does it affect the surroundings?\",\"answer\":\"An exothermic reaction releases energy to its surroundings, usually as heat, light, or sound. Because energy is released, the temperature of the surroundings increases.\"},{\"question\":\"What is an endothermic reaction, and how does it affect the surroundings?\",\"answer\":\"An endothermic reaction absorbs energy from its surroundings. As energy is absorbed, the temperature of the surroundings decreases.\"},{\"question\":\"How do energy diagrams for exothermic and endothermic reactions differ?\",\"answer\":\"In an exothermic energy diagram, reactants start at higher energy and products end at lower energy. In an endothermic diagram, reactants start lower and products end higher because energy is absorbed.\"}]","Energy Changes - Exothermic and Endothermic Reactions | PDF",1792971318,48]