[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-343490-105":59,"doc-detail-343490-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","2019-ap-chemistry-free-response-questions-chemistry-section-ii-7-questions","2019 AP® Chemistry Free-Response Questions - Chemistry - Section II - 7 Questions","","2019 AP Chemistry Free-Response Questions, Chemistry Section II, provides seven chemistry problems to be completed in 1 hour and 45 minutes. The section includes three long free-response questions and four short free-response questions, with scoring aligned to question length. It includes permitted calculator use, instructions for showing work and using significant figures, and detailed chemistry content such as Lewis structures, hydrogen bonding representations, concentration calculations for urea solutions, and thermodynamic reasoning via Le Chatelier’s principle, enthalpy/entropy, and aqueous entropy.",{"@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/2019-ap-chemistry-free-response-questions-chemistry-section-ii-7-questions/343490/",{"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/2019-ap-chemistry-free-response-questions-chemistry-section-ii-7-questions/343490.png","ImageObject",300,407,{"name":92,"@type":93},"Lucas Martin","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-25","2026-09-22",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",11,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"How long is Chemistry Section II, and how many questions are included?","Question",{"text":113,"@type":114},"Chemistry Section II allows 1 hour and 45 minutes and contains 7 questions.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Which questions are considered long free-response questions in this section?",{"text":118,"@type":114},"Questions 1–3 are long free-response questions requiring about 23 minutes each and are worth 10 points each.",{"name":120,"@type":111,"acceptedAnswer":121},"What specific skills are emphasized for answering, such as calculations and work shown?",{"text":122,"@type":114},"Responses must be written in the provided space, show the method and steps for calculations, include appropriate examples or equations, and use significant figures to receive credit.","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},343490,1790534908,{"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":145,"read_time":146,"preview_page_count":4},8796095360427,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","2019  \nAP® Chemistry Free-Response Questions  \n© 2019 The College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo are registered trademarks of the College Board. Visit the College Board on the web: [collegeboard.org](collegeboard.org).  \n[AP Central is the official online home for the AP Program: apcentral.collegeboard.org](AP Central is the official online home for the AP Program: apcentral.collegeboard.org).  \nAP® CHEMISTRY EQUATIONS AND CONSTANTS  \nThroughout the exam the following symbols have the definitions specified unless otherwise noted.  \nL, mL = liter(s), milliliter(s)  \ng = gram(s)  \nnm = nanometer(s) atm = atmosphere(s)  \nmm Hg = millimeters of mercury J, kJ = joule(s), kilojoule(s)  \nV = volt(s)  \nmol = mole(s)  \n\n| ATOMIC STRUCTURE\u003Cbr>E = h ν\u003Cbr>c = λν | E = energy\u003Cbr>ν = frequency\u003Cbr>λ = wavelength\u003Cbr>Planck’s constant, h = 6.626 × 10−34 Js Speed of light, c = 2.998 × 108 ms−1\u003Cbr>Avogadro’s number = 6.022 × 1023 mol−1 Electron charge, e = −1.602 × 10−19 coulomb |\n| --- | --- |\n| EQUILIBRIUM\u003Cbr>Kc = [[CA]]ca[[DB]]db~~ ~~ , where a A + b B R c C + d D\u003Cbr>(PC )c (PD )d  Kp = (PA )a (PB )b\u003Cbr>[H􀀎 ][A 􀀐 ] Ka =  [HA] \u003Cbr>[OH 􀀐 ][HB􀀎 ] Kb =  [B] \u003Cbr>Kw = [H+][OH − ] = 1.0 × 10−14 at 25°C = Ka × Kb\u003Cbr>pH = −log[H+], pOH = −log [OH − ]\u003Cbr>14 = pH + pOH pH = pKa+ log ~~ [~~[AH]~~]~~\u003Cbr>pKa = −logKa , pKb = −logKb | Equilibrium Constants Kc (molar concentrations) Kp (gas pressures)\u003Cbr>Ka (weak acid)\u003Cbr>Kb (weak base)\u003Cbr>Kw (water) |\n| KINETICS\u003Cbr>ln[A] t − ln[A]0 = − kt\u003Cbr>>1A@t~~ ~~ 􀀐 >1A@0~~ ~~ = ktt  0.693 ½ = k | k = rate constant\u003Cbr>t = time t ½ = half-life |\n\n\n| GASES, LIQUIDS, AND SOLUTIONS |  | P = pressure |\n| --- | --- | --- |\n| PV = nRT\u003Cbr>PA = Ptotal × XA, where XA = ~~t~~mo~~t~~oa~~l~~les~~m~~oA~~le~~s |  | V = volume\u003Cbr>T = temperature n = number of moles m = mass |\n| Ptotal = PA + PB + PC + . . . |  | M = molar mass |\n| n = mM K = °C + 273 |  | D = density\u003Cbr>KE = kinetic energy\u003Cbr>v = velocity\u003Cbr>A = absorbance |\n| D = mV KE per molecule = 1~~2 ~~ mv 2\u003Cbr>Molarity, M = moles of solute per liter of solution A = abc |  | a = molar absorptivity b = path length\u003Cbr>c = concentration\u003Cbr>Gas constant, R = 8.314 J mol−1K−1 = 0.08206 L atm mol−1 K−1 = 62.36 L torr mol−1 K−1\u003Cbr>1 atm = 760 mm Hg = 760 torr STP = 273.15 K and 1.0 atm\u003Cbr>Ideal gas at STP = 22.4 L molí1 |\n| THERMODYNAMICS / ELECTROCHEMISTRY\u003Cbr>q = mc∆T |  | q = heat\u003Cbr>m = mass\u003Cbr>c = specific heat capacity T = temperature\u003Cbr>S° = standard entropy H° = standard enthalpy\u003Cbr>G° = standard Gibbs free energy n = number of moles\u003Cbr>E° = standard reduction potential I = current (amperes)\u003Cbr>q = charge (coulombs) t = time (seconds)\u003Cbr>Faraday’s constant, 􀀉 = 96,485 coulombs per mole\u003Cbr>of electrons\u003Cbr> 1 joule \u003Cbr>1 volt =\u003Cbr>1 coulomb |\n| ∆ S° =∆H° =∆G° =\u003Cbr>∆G° =\u003Cbr>=\u003Cbr>=\u003Cbr>I = | Ç SD products 􀀐 ÇSD reactants Ç DHfD products 􀀐 ÇDHfD reactants\u003Cbr>Ç DGfD products 􀀐 ÇDGfD reactants\u003Cbr>∆H° − T∆S°\u003Cbr>−RTlnK\u003Cbr>− n􀀉 E °\u003Cbr>q\u003Cbr>t |  |\n\n2019 AP® CHEMISTRY FREE-RESPONSE QUESTIONS  \nCHEMISTRY  \nSection II  \nTime—1 hour and 45 minutes  \n7 Questions  \nYOU MAY USE YOUR CALCULATOR FOR THIS SECTION.  \nDirections: Questions 1–3 are long free-response questions that require about 23 minutes each to answer and are worth 10 points each. Questions 4–7 are short free-response questions that require about 9 minutes each to answer and are worth 4 points each.  \nWrite your response in the space provided following each question. 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.  \n1. The compound urea, H2NCONH2 , is widely used in chemical fertilizers. The complete Lewis electron-dot diagram for the urea molecule is shown above.  \n(a) Identify the hybridization of the valence orbitals of the carbon atom in the urea molecule.  \n(b) Ur","cbCais9eVGRt6hso","https://ap.wps.com/l/cbCais9eVGRt6hso","pdf",747681,14,"English","# AP® Chemistry Equations and Constants\n# Equilibrium\n# Kinetics\n# Gases, Liquids, and Solutions\n# Thermodynamics / Electrochemistry\n# Chemistry\n## Section II\n## Directions (Questions 1–7)\n## Question 1 (a–h) - Urea","[{\"question\":\"How long is Chemistry Section II, and how many questions are included?\",\"answer\":\"Chemistry Section II allows 1 hour and 45 minutes and contains 7 questions.\"},{\"question\":\"Which questions are considered long free-response questions in this section?\",\"answer\":\"Questions 1–3 are long free-response questions requiring about 23 minutes each and are worth 10 points each.\"},{\"question\":\"What specific skills are emphasized for answering, such as calculations and work shown?\",\"answer\":\"Responses must be written in the provided space, show the method and steps for calculations, include appropriate examples or equations, and use significant figures to receive credit.\"}]","2019 AP® Chemistry Free-Response Questions - Chemistry - Section II - 7 Questions | PDF",1790051307,35]