[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-311458-105":59,"doc-detail-311458-en":131},{"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":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","ap-chemistry-free-response-questions-section-ii","AP® Chemistry - Free-Response Questions - Section II","","AP® Chemistry Section II free-response questions (7 total) are presented with an allotted time of 1 hour and 45 minutes and detailed instructions on how to record answers, show calculations, use significant figures, and apply reference information such as a periodic table and equation/constants lists. The questions include calorimetry and enthalpy of solution work for KCl with parts on electron configuration, ion size, interpreting dissolution completion, calculating thermal energy and molar enthalpy, and evaluating calorimeter insulation effects. Additional tasks address chromate/dichromate ions and includes a calorimetry comparison using RbCl, along with Ksp-based solubility calculations and KCl common-ion reasoning.",{"@graph":69,"@context":123},[70,84,106],{"@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/ap-chemistry-free-response-questions-section-ii/311458/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/ap-chemistry-free-response-questions-section-ii/311458.png","ImageObject",300,407,{"name":92,"@type":93},"Dozel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-31","2026-09-20",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",13,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"How should students format free-response answers in Section II?","Question",{"text":113,"@type":114},"Students must place answers in the provided spaces for each part and label sub-parts as needed. Calculations require showing the method and steps, and work must be shown to receive credit. A pencil or black/dark blue pen is required.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How can the student tell when KCl dissolution is complete in Question 1?",{"text":118,"@type":114},"The dissolution is complete when the temperature readings level off and no longer change as additional KCl is stirred, indicating the solution composition has stabilized.",{"name":120,"@type":111,"acceptedAnswer":121},"Why does imperfect insulation affect the magnitude of DHsoln in Question 1, part D?",{"text":122,"@type":114},"If the calorimeter loses or gains heat due to imperfect insulation, the measured temperature change will not reflect only heat from dissolution. As a result, the calculated magnitude of DHsoln would deviate from the accepted value; the justification is based on whether the solution loses heat or gains heat to/from the calorimeter.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},311458,1789894313,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":140,"language":141,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":67,"update_tm":130,"read_time":145,"preview_page_count":4},962085662650,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","2026  \nAP® Chemistry  \nFree-Response Questions  \n© 2026 College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo are registered [trademarks of College Board. Visit College Board on the web: collegeboard.org](trademarks of College Board. Visit College Board on the web: collegeboard.org).  \nAP Central is the official online home for [the AP Program: apcentral.collegeboard.org](the AP Program: apcentral.collegeboard.org).  \nCHEMISTRY  \nSECTION II  \nTIME – 1 HOUR AND 45 MINUTES  \nDirections:  \nSection II has 7 questions and lasts 1 hour and 45 minutes.  \nYou may use the available paper for scratch work and planning, but only work written in the free-response booklet will be scored. Any work done on scratch paper will not be scored. Place your answers in the space provided for each part in the booklet (e.g., Part A, Part B, Part C) . Label sub-parts (e.g., i., ii., iii.) as needed. Use a pencil or a pen with black or dark blue ink to write your responses.  \nFor each question, show your work for each part in the space provided for that part in the freeresponse booklet. Examples and equations may be included in your responses where appropriate. For calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Pay attention to significant figures. A calculator is allowed in this section. You may use a handheld four-function, scientific, or graphing calculator, or the calculator available in this application. Reference information, including a periodic table and lists of equations and constants, can be used throughout the exam. A digital version is available in this application.  \nYou may pace yourself as you answer the questions in this section, or you may use these optional timing recommendations:  \nQuestions 1 through 3 are long free-response questions. It is suggested that you spend about 23 minutes on each of those questions. Questions 4 through 7 are short free-response questions. It is suggested that you spend about 9 minutes on each of those questions.  \nYou can go back and forth between questions in this section until time expires. The clock will turn red when 5 minutes remain—the proctor will not give you any time updates or warnings.  \nNote: This exam was originally administered digitally. It is presented here in a format optimized for teacher and student use in the classroom.  \nDuring the AP Exam administration, students have access to reference information. To see the reference information for this course, please visit AP Central:  \n[https://apcentral.collegeboard.org/exam-administration-ordering-scores/administering-exams/](https://apcentral.collegeboard.org/exam-administration-ordering-scores/administering-exams/)[ ](https://apcentral.collegeboard.org/exam-administration-ordering-scores/administering-exams/)[subject-specific/reference-information](subject-specific/reference-information)  \nQuestion 1  \n1. A student performs a calorimetry experiment with KCl.  \nPart A  \nConsider the K+ ion in KCl.  \ni. Write the complete ground-state electron configuration for the potassium ion, K+ .  \nii. Which has the larger radius, the K+ ion or the K atom? Explain your reasoning using principles of atomic structure.  \nThe following information applies to parts B, C, D, and E.  \nA student performs an experiment to determine the enthalpy of solution, DHsoln , of KCl. The student places water in a calorimeter, measures the initial temperature, adds KCl (s) , and stirs until the KCl dissolves completely. The temperature is continuously monitored during the experiment. Data from the experiment are given in the following table.  \n\n| Mass of water | 97.5 g |\n| --- | --- |\n| Mass of KCl (s) | 6.80 g |\n| Initial temperature of water | 24.5cC |\n| Final temperature of solution | 21. 1cC |\n\nPart B  \nDescribe how the student can use the temperature readings during the experiment to determine when the dissolution is complete.  \nPar","cbCaijaNBqHuYIYI","https://ap.wps.com/l/cbCaijaNBqHuYIYI","pdf",407628,17,"English","# SECTION II: TIME - 1 HOUR AND 45 MINUTES\n## Directions and pacing guidance\n## Question 1 (Calorimetry and solution enthalpy)\n## Question 2 (Chromate and dichromate ions)","[{\"question\":\"How should students format free-response answers in Section II?\",\"answer\":\"Students must place answers in the provided spaces for each part and label sub-parts as needed. Calculations require showing the method and steps, and work must be shown to receive credit. A pencil or black/dark blue pen is required.\"},{\"question\":\"How can the student tell when KCl dissolution is complete in Question 1?\",\"answer\":\"The dissolution is complete when the temperature readings level off and no longer change as additional KCl is stirred, indicating the solution composition has stabilized.\"},{\"question\":\"Why does imperfect insulation affect the magnitude of DHsoln in Question 1, part D?\",\"answer\":\"If the calorimeter loses or gains heat due to imperfect insulation, the measured temperature change will not reflect only heat from dissolution. As a result, the calculated magnitude of DHsoln would deviate from the accepted value; the justification is based on whether the solution loses heat or gains heat to/from the calorimeter.\"}]","AP® Chemistry - Free-Response Questions - Section II | PDF",43]