ap-chemistry-2017-international-practice-exam-scoring-worksheet - Read online for free. Ap Chemistry Syllabus.Dr V shares all her tips and advice for answering free response question #4 from the 2018 exam. AP Chemistry.AP MCQ ARCHIVE. Here you’ll find links to the released MCQs from previous AP Chemistry exams. Here’s the FRQ Archive page. Other MC exams have been released by the College Board, but they are considered ‘secure’ (yes I know that’s naive and hilarious) so they are not linked. Links to complete exams are to external content that I do ... Zr. The ideal gas law best describes the properties of which of the following gases. N2. at 298k and 1 atm, Br2 is a liquid with a high vapor pressure, and Cl2 is a gas. forces among Br2 molecules are stronger than those among Cl2 molecules. which of the following has the bonds arranged in order of decreasing polarity.Hi Everyone! In this video, we discuss the third FRQ from the AP Chemistry 2017 exam. We talk about gaseous equilibrium and buffer solutions.AP® CHEMISTRY 2019 SCORING GUIDELINES Question 1 (continued) (c) Calculate the concentration of urea, in mol/L, in the saturated solution at 20.°C. 5.39 g H2NCONH2 x = 0.0897 mol - 60.06 g 0.0897 mol =17.9 M 0.00500 L . 1 point is earned for the correct number of moles of urea (may be implicit). 1 point is earned for the correct molarity.AP® CHEMISTRY 2019 SCORING GUIDELINES Question 1 (continued) (c) Calculate the concentration of urea, in mol/L, in the saturated solution at 20.°C. 5.39 g H2NCONH2 x = 0.0897 mol - 60.06 g 0.0897 mol =17.9 M 0.00500 L . 1 point is earned for the correct number of moles of urea (may be implicit). 1 point is earned for the correct molarity. AP® Chemistry 2005 Free-Response Questions The College Board: Connecting Students to College Success The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 4,700 schools, colleges, universities, and otherAnswer the following questions about Mg(OH)i. At 25 C, the value of the solubility product constant, Ksp, for Mg(OH)i(s) is 1.8 10 11 . (a) Calculate the number of grams of Mg(OH)i (molar mass 58.32 g/mol) that is dissolved in 100. mL of a saturated solution of Mg(OH)i at 25°C. = --- 3 1.8 ́ 10 -11 xView ap-chemistry-frq-2017 from BIO N/A at Garey Senior High. 2017 AP Chemistry Free-Response Questions 2017 The College Board. College Board, Advanced Placement Program, AP, AP Central, and the AP® CHEMISTRY 2015 FRQ ANSWERS (submitted by Michael Farabaugh on 05/07/15) Question 2 The pressure of the gas collected in the test tube at 305 K = 0.822 atm 760 torr 0.822 atm = 625 torr 1 atm The vapor pressure of water at 305 K is 35.7 torr The partial pressure of “dry” C2H4(g) is equal to 625 – 35.7 = 589 torr2017 AP ® SEMINAR FREE-RESPONSE QUESTIONS . Part B. Suggested time — 90 minutes. Directions: Read the four sources carefully, focusing on a theme or issue that connects them and the different perspectives each represents. Then, write a logically organized, well-reasoned, and well-written argument that presents your own perspective …Presentation” in the AP Physics; Physics C: Mechanics, Physics C: Electricity and Magnetism Course Description or “Terms Defined” in the AP Physics 1: Algebra-Based and AP Physics 2: Algebra-Based Course and Exam Description. 5. The scoring guidelines typically show numerical results using the value g = 9.8 m s2, but use ofAP Test Formula Sheet SRP Table AP Full Lab Write-Up Section Descriptions HomeAP FRQ WORKED ANSWER ARCHIVE. Here you’ll find links to worked answers to FRQs from previous AP Chemistry exams. Every released FRQ from 1990 to 2022 has its own, worked answer. 2020 was a COVID interrupted year, and no formal exam questions were released into the public domain by the College Board, although AP teachers do have …As you know, the FRQ section on the AP Chem exam is 7 questions long (3 long, 4 short answer questions). You will have 1 hour and 45 minutes to complete the section. Your score on this section equates to 50% of your total exam score. Here is a clip of Dylan Black, a chemistry streamer, going over the format of the exam as a whole.2016 AP® CHEMISTRY FREE-RESPONSE QUESTIONS 1-3 are long free- response questions that require about 23 minutes each to answer and are worth 10. A.P. part.Study Guides by Unit. ⚛️ Unit 1 – Atomic Structure & Properties. 🤓 Unit 2 – Molecular & Ionic Bonding. 🌀 Unit 3 – Intermolecular Forces & Properties. 🧪 Unit 4 – Chemical Reactions. 👟 Unit 5 – Kinetics. 🔥 Unit 6 – Thermodynamics. ⚖️ Unit 7 – Equilibrium. 🍊 …This pdf document provides a sample response for question 7 of the 2017 AP Chemistry exam, which involves calculating the equilibrium constant and the concentrations of species in a reaction mixture. The document also explains the scoring guidelines and the points awarded for each part of the question. The pdf is useful for students who want to practice …Course Overview. AP Chemistry is an introductory college-level chemistry course. Students cultivate their understanding of chemistry through inquiry-based lab investigations as they explore the four Big Ideas: scale, proportion, and quantity; structure and properties of substances; transformations; and energy.2019 AP ® CHEMISTRY FREE-RESPONSE QUESTIONS . GO ON TO THE NEXT PAGE. -5-CHEMISTRY . Section II . Time—1 hour and 45 minutes . 7 Questions . YOU MAY USE YOUR CALCULATOR FOR THIS SECTION. Directions: Questions 1–3 are long free-response questions that require about 23 minutes each to answer and are worth 10 …Answer the following questions about Mg(OH)i. At 25 C, the value of the solubility product constant, Ksp, for Mg(OH)i(s) is 1.8 10 11 . (a) Calculate the number of grams of Mg(OH)i (molar mass 58.32 g/mol) that is dissolved in 100. mL of a saturated solution of Mg(OH)i at 25°C. = --- 3 1.8 ́ 10 -11 x2017 AP® Chemistry Free-Response Questions • Number of Students Scored 158,931 • Number of Readers 347 • Score Distribution Exam Score N %At • Global Mean 2.67 The following comments on the 2017 free-response questions for AP® Chemistry were written by the Chief Reader, Roger Kugel, University of Cincinnati.WongChemistry · 2018 Free Response Questions · 2017 Free Response Questions · 2016 Free Response Questions · 2015 Free Response Questions · 2014 Free Response ...AP ® CHEMISTRY 2018 SCORING GUIDELINES © 2018 The College Board. Visit the College Board on the Web: www.collegeboard.org. Question 2 (continued) 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 answerDownload free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. AP Exams are regularly updated to align with best practices in college-level learning. Not all free-response questions on this page reflect the current exam, but the question types and the topics are ...D. 2NO (g) → N2 (g) + O2 (g) + heat. Answer 3. Correct Answer: A. Endothermic reactions have the heat on the left side and a positive ΔH. Reactions with an increase in entropy also have a positive ΔS. Because the reaction in choice (A) produces two moles of gas for each mole of solid, it would have a positive ΔS.2017 AP Exam Schedule. This is AP exam schedule for 2017. Students must check with ... Chemistry, May 01 - Mon - AM. Chinese Lang. and Culture, May 04 - Thu - PM.June 11, 2017. Placed in the public domain by the College Board at ChemEd 2017, here are the 2017 FRQ Average Scores. Here are the 2017 FRQ's themselves. Honestly, not much to report here but enjoy, and please ask questions in the comments. The official answers can be found here. My answers to the 2017 FRQ's can be found here.AP ® Chemistry Sample Student Responses ... Directions: Questions 1-3 are long free.response questions . that . require . about 23 minutes each . to . answer and areAP® CHEMISTRY 2017 SCORING COMMENTARY Question 4 Overview This question assessed students’ experiment correctly and to identify the least polar dye from among …AP Chemistry Scoring Guidelines 2017 Author: The College Board Subject: AP Chemistry Scoring Guidelines 2017 Keywords: AP Chemistry; Scoring Guidelines; 2017; exam information; scoring information; teacher resources Created Date: 7/10/2017 4:32:53 PMI go through the first 10-point free response question on the 2017 AP chemistry exam.AP MCQ ARCHIVE. Here you’ll find links to the released MCQs from previous AP Chemistry exams. Here’s the FRQ Archive page. Other MC exams have been released by the College Board, but they are considered ‘secure’ (yes I know that’s naive and hilarious) so they are not linked. Links to complete exams are to external content that I do ... 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 answer3. (a) 1s22s22p63s23p63d6 OR [Ar]3d6 1 point for the correct electron configuration (b) The radius of Fe2+ is greater than the radius of Fe3+ due to the additional electron-electron repulsions between the two paired d-orbital electrons in Fe2+. 1 …2018 AP ® CHEMISTRY FREE-RESPONSE QUESTIONS 1. A student performs an experiment to determine the value of the enthalpy change, D H D rxn, for the. oxidation-reduction reaction represented by the balanced equation above. (a) Determine the oxidation number of Cl in. NaOCl. (b) Calculate the number of grams of Na 2 S 2 O 3 needed to prepare. 100. ...For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit AP Chemistry Practice Exam From the 2 016 Administration NOTE: This is a modified version of the 2016 AP Chemistry Exam. This exam ma y no t be posted on school or persona l websites , no r electronically redistribute d fo r an y reason . Thi s Released Exa m is provided by th e Colleg e Boar d for AP Exam preparation . Teacher s ar e permitted to …2017 AP® CHEMISTRY FREE-RESPONSE QUESTIONS © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT PAGE. -11- 2 C3H7OH ... AP® Chemistry 2010 Free-Response Questions The College Board The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the College Board is composed of more than 5,700 schools, colleges, universities and other educational organizations.-2- Formulas begin on page 3. Questions begin on page 6. Tables begin on page 13. 2017 AP ® STATISTICS FREE-RESPONSE QUESTIONS2020 FRQs and ANSWERS. In 2020 the AP chemistry exam was COVID affected, and the exam was offered in an online format only, with approx. 30, different FRQs being used in various combinations in the exams. The questions that a particular teacher’s students were given were released to that individual teacher, but there were no collective ...Ap chemistry frq 2017 - Stuffs for ap chem hw assignment and frq - 2017 AP Chemistry Free-Response - Studocu Southern New Hampshire University University of Massachusetts Lowell University of California Los Angeles Silver Creek High School (Colorado) Miami Dade College University of Houston-Clear Lake Biology (BIOL 1409)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. Write your response in the space provided following each question. Question: 2017 AP CHEMISTRY FREE-RESPONSE QUESTIONS N.) +0.22 NOR) 34 At high temperatures. Nys) and 0:18) can react to produce nitrogen monoxide.AP ® Chemistry 2021 Free-Response Questions . Begin your response to . QUESTION 1 . on this page. CHEMISTRY . SECTION II . Time—1 hour and 45 minutes 7 Questions . …Studying for the AP® Chemistry exam can seem scary. Fortunately, this ultimate list of AP® Chemistry tips will make studying for the exam a breeze! Skip to content. Subjects; Classes; ... This suggestion showed up more than 3 times on the 2017, 2018 and 2019 FRQ reports.1 point For the correct [HCl]calculated remaining, consistent with the number of moles reacted: 1.00 mol HCl 0.0500 L 0.0500 mol HCl initially presentAP® Chemistry 2012 Free-Response Questions . About the College Board . The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is2017 AP Exam Schedule. This is AP exam schedule for 2017. Students must check with ... Chemistry, May 01 - Mon - AM. Chinese Lang. and Culture, May 04 - Thu - PM.The solutions contain the most common method of solving the free-response questions and the allocation of points for this solution. Some also contain a common alternate solution. ... AP® PHYSICS 1 2017 SCORING GUIDELINES Question 1 7 points total Distribution of points (a) 2 points Correct ranking: (= D = E)>(B D= C) OR A = = E B, =Ć mol CS2 ́ 76.13 g CS 2 = 7.9 g CS mol CS2 2 0.31 mol Cl2 3 mol Cl2 point is earned for using the correct mole ratio (may be implicit). point is earned for the mass of CS 2 . (b) At 30 C the reaction is thermodynamically favorable, but no reaction is observed to occur. However, at 120 C, the reaction occurs at an observable rate. V = 4.7 ¥ 10−5 L (or 4.8 ¥ 10−5 L) = 4.7 ¥ 10−2 mL (or 4.8 ¥ 10−2 mL) 1 point is earned for the correct volume. (c) There are several ways to dissolve salts that have limited solubility. Describe one procedure to redissolve theAP ® CHEMISTRY. Sample Question 1 Time allotted: 25 minutes (plus 5 minutes to submit) Common additives to drinking water include elemental chlorine, chloride ions, AP Classroom Question Bank is a powerful online resource that allows you to create customized practice tests for your AP Chemistry students. You can choose from thousands of questions aligned to the course and exam framework, adjust the difficulty level, and add your own feedback. AP Classroom Question Bank helps you prepare your students for the AP Chemistry exam with confidence and ease.AP® CHEMISTRY 2010 SCORING GUIDELINES (Form B) Question 1 (10 points) The compound butane, C 4 H 10, occurs in two isomeric forms, n-butane and isobutane (2-methyl propane). Both compounds exist as gases at 25°C and 1.0 atm. (a) Draw the structural formula of each of the isomers (include all atoms). Clearly label each structure.I go through the first 10-point free response question on the 2017 AP chemistry exam.I’m Adrian Dingle. I’m a true “chemistry freelancer” and Subject Matter Expert (SME). I bring thirty-two years of full-time classroom chemistry teaching experience, and tens of thousands of hours of one-on-one chemistry tutoring across the globe, to a seventeen year writing career that includes several best-selling, international award-winning chemistry …Presentation” in the AP Physics; Physics C: Mechanics, Physics C: Electricity and Magnetism Course Description or “Terms Defined” in the AP Physics 1: Algebra-Based and AP Physics 2: Algebra-Based Course and Exam Description. 5. The scoring guidelines typically show numerical results using the value g = 9.8 m s2, but use of2013 AP Chemistry Scoring Guidelines - Form B.pdf View Download 302k: v. 1 : Apr 17, 2017, 6:48 AM: Andrew Klamm: Ċ: ap big review fr answers.pdf View Download: Answers - free response by topic packet 2534k: v. 1 : Mar 21, 2017, 5:22 AM: Andrew Klamm: ĉ: free response topic review.docx View Download: Free response bank by topic 298k: v. 1 ...Answer the following questions about Mg(OH)i. At 25 C, the value of the solubility product constant, Ksp, for Mg(OH)i(s) is 1.8 10 11 . (a) Calculate the number of grams of Mg(OH)i (molar mass 58.32 g/mol) that is dissolved in 100. mL of a saturated solution of Mg(OH)i at 25°C. = --- 3 1.8 ́ 10 -11 x AP® Chemistry 2007 Scoring Guidelines Form B The College Board: Connecting Students to College Success The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 5,000 schools, colleges, universities, and otherAP® CHEMISTRY 2015 FRQ ANSWERS (submitted by Michael Farabaugh on 05/07/15) Question 2 The pressure of the gas collected in the test tube at 305 K = 0.822 atm 760 torr 0.822 atm = 625 torr 1 atm The vapor pressure of water at 305 K is 35.7 torr The partial pressure of “dry” C2H4(g) is equal to 625 – 35.7 = 589 torrI go through the first 10-point free response question on the 2017 AP chemistry exam.2020 FRQs and ANSWERS. In 2020 the AP chemistry exam was COVID affected, and the exam was offered in an online format only, with approx. 30, different FRQs being used in various combinations in the exams. The questions that a particular teacher’s students were given were released to that individual teacher, but there were no collective ...AP® Chemistry 2007 Scoring Guidelines The College Board: Connecting Students to College Success The College Board is a not-for-profit membership association whose mission is to connect students to college success and2017: Free-Response Questions. Questions. Scoring. Samples and Commentary. Free-Response Questions. Scoring Guidelines. Chief Reader Report. Scoring Statistics. Scoring Distributions. Sample Responses Q1. Sample Responses Q2. Sample Responses Q3. Sample Responses Q4. Sample Responses Q5. Sample Responses Q6. Sample Responses Q7AP® CHEMISTRY 2019 SCORING GUIDELINES Question 1 (continued) (c) Calculate the concentration of urea, in mol/L, in the saturated solution at 20.°C. 5.39 g H2NCONH2 x = 0.0897 mol - 60.06 g 0.0897 mol =17.9 M 0.00500 L . 1 point is earned for the correct number of moles of urea (may be implicit). 1 point is earned for the correct molarity. 2017 AP Chemistry Free Response Questions: Free response question #7 (titration/galvanic cell problem) solution video edited and recorded by SpotVids. Not en...AP® Chemistry 2013 Scoring Guidelines . The College Board . The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association iś mol CS2 ́ 76.13 g CS 2 = 7.9 g CS mol CS2 2 0.31 mol Cl2 3 mol Cl2 point is earned for using the correct mole ratio (may be implicit). point is earned for the mass of CS 2 . (b) At 30 C the reaction is thermodynamically favorable, but no reaction is observed to occur. However, at 120 C, the reaction occurs at an observable rate.AP Practice Question - 2017 #2. The following question was posted by College Board and is part of question two on the free-response section of the 2017 AP Chemistry exam. The ammonium salt of isocyanic acid is a product of the decomposition of urea, CO ... Answer to FRQ 2017 #2e-f Part e, i.AP FRQ WORKED ANSWER ARCHIVE. Here you’ll find links to worked answers to FRQs from previous AP Chemistry exams. Every released FRQ from 1990 to 2022 has its own, worked answer. 2020 was a COVID interrupted year, and no formal exam questions were released into the public domain by the College Board, although AP teachers do have …7 Questions Time—1 hour and 45 minutes . YOU MAY USE YOUR CALCULATOR FOR THIS SECTION. Directions: Questions 1–3 are long free-response questions that require about 23 minutes each to answer and are ́ mol CS2 ́ 76.13 g CS 2 = 7.9 g CS mol CS2 2 0.31 mol Cl2 3 mol Cl2 point is earned for using the correct mole ratio (may be implicit). point is earned for the mass of CS 2 . (b) At 30 C the reaction is thermodynamically favorable, but no reaction is observed to occur. However, at 120 C, the reaction occurs at an observable rate.Preparing for the 2023 AP Chemistry Exam. February 21, 2023, by Daniel Bloss. AP Chemistry is a rigorous course with a challenging exam, but with the right study tools and study approach, you can perform your best on test day. The AP Chemistry exam is 3 hours for regular time and 4.5 hours with extended time.AP® CHEMISTRY 2017 SCORING GUIDELINES Question 1 (continued) I I I I I I I I : Activation :--Energy I I I point is earned for a curve that has peak above and to the left of the given curve. I point is earned for a curve that is below the given curve in the region beyond the activation energy. (c) S2Cl2 is a product of the reaction.AP® Chemistry 2013 Free-Response Questions . About the College Board . The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is1. Carbon tetrachloride, CCl4(g), can be synthesized according to the reaction represented above. A chemist runs the reaction at a constant temperature of 120 °C in a rigid 25.0 L container. Chlorine gas, Cl2(g), is initially present in the container at a pressure of 0.40 atm. How many moles of Cl2(g) are in the container?2. The manager of a local fast-food restaurant is concerned about customers who ask for a water cup when placing an order but fill the cup with a soft drink from the beverage fountain instead of filling the cup with water.1 student, out of 107,000 worldwide, our future Secretary of State, earned all 130/130 pts possible on this year’s AP Euro History exam. Multiple-choice: students scored best on questions on topics from 1648-1815. Short answer questions: students scored very well on #2 (printing centers) & #4 (Scientific Rev).NOTE: This is a modified version of the 2017 AP Chemistry Exam. This exam ... If any students used extra paper for a question in the free-response section, have ...
Section II of the AP Chemistry exam is 90 minutes long and consists of seven questions: three long and four short free-response questions. The topics covered in the free-response questions are usually fairly common chemistry topics. However, a well-known topic doesn’t mean the problem will be simple.. Ap computer science a 2023 frq
2017 AP® CHEMISTRY FREE-RESPONSE QUESTIONS © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT PAGE. -12- 6 ... AP Chemistry 2017 FRQ answers. Bi) more collisions Bc higher frequency at higher temperature. Also more effective collisions taking place Bii) I drew the line below the curve. ci) cl-s-s-cl with no double bonds, just dots filled around until they all …AP MCQ ARCHIVE. Here you’ll find links to the released MCQs from previous AP Chemistry exams. Here’s the FRQ Archive page. Other MC exams have been released by the College Board, but they are considered ‘secure’ (yes I know that’s naive and hilarious) so they are not linked. Links to complete exams are to external content that I do ...I go through the first 10-point free response question on the 2017 AP chemistry exam.AP Chemistry Sample Student Responses and Scoring Commentary Author: College Board Subject: AP; Advanced Placement Keywords: 2017 AP Exam Administration; student samples; scoring commentary; exam information; scoring information; exam materials; scoring materials; student responses; exam resources; exam preparation; teacher resources; ADAThe multiple-choice section of the AP Chemistry test consists of 60 questions that you will have 90 minutes to answer. That’s an average of one and a half minutes per question. Refresh yourself on the general AP test strategies and multiple-choice strategies, then apply the concepts to the following five AP Chemistry practice questions.2017 AP® CHEMISTRY FREE-RESPONSE QUESTIONS © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT PAGE. -12- 6 ...AP® Chemistry 2013 Scoring Guidelines . The College Board . The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is AP® CHEMISTRY 2017 SCORING GUIDELINES Question 5 A student performs an experiment to determine the enthalpy of combustion of 2-propanolC3H70H(l), , which combusts in oxygen according to the equation above. Section II of the AP Chemistry exam is 90 minutes long and consists of seven questions: three long and four short free-response questions. The topics covered in the free-response questions are usually fairly common chemistry topics. However, a well-known topic doesn’t mean the problem will be simple.Questions And Worked Solutions For AP Chemistry 2017, Practice Exam. AP Chemistry 2017 Free Response Questions - Complete Paper (pdf) Carbon tetrachloride, CCl 4 (g), …Do you want to see how well you can answer the first free-response question of the 2017 AP Chemistry exam? Check out this pdf file that contains the question, the scoring guidelines, and the sample responses from exam takers. You can also compare your work with the scoring distributions and learn from the best practices. Know the free-response questions format. On the AP® Chemistry exam, you will have 105 minutes to answer 7 essay questions, broken down like this: ... This suggestion showed up more than 3 times on the 2017, 2018 and 2019 FRQ reports. ... To receive full credit on AP® Chemistry free-response questions responses, make sure …AP® CHEMISTRY 2019 SCORING GUIDELINES Question 1 (continued) (c) Calculate the concentration of urea, in mol/L, in the saturated solution at 20.°C. 5.39 g H2NCONH2 x = 0.0897 mol - 60.06 g 0.0897 mol =17.9 M 0.00500 L . 1 point is earned for the correct number of moles of urea (may be implicit). 1 point is earned for the correct molarity.WongChemistry · 2018 Free Response Questions · 2017 Free Response Questions · 2016 Free Response Questions · 2015 Free Response Questions · 2014 Free Response ...2018 AP ® CHEMISTRY FREE-RESPONSE QUESTIONS 1. A student performs an experiment to determine the value of the enthalpy change, D H D rxn, for the. oxidation-reduction reaction represented by the balanced equation above. (a) Determine the oxidation number of Cl in. NaOCl. (b) Calculate the number of grams of Na 2 S 2 O 3 needed to prepare. 100. ... .