2023 chem frq

1 point is earned for a correct answer with a valid justification. CH3CH2COOH(aq) + H2O(l) CH3CH2COO (aq) + H3O+(aq) Propanoic acid, CH3CH2COOH, is a carboxylic acid that reacts with water according to the equation above. At 25 C the pH of a 50.0 mL sample of 0.20 M CH3CH2COOH is 2.79.

Manifold Bio's molecular machinery could let a hundred molecules be tested simultaneously in a single living system, potentially upending the whole process. In the creation of a ne...In this video, we'll unpack a sample free-response question—FRQ (Short).Download questions here: https://tinyurl.com/yhd8vwabStay motivated and keep preparin...Ap Chemistry 2023 Frq Scoring Guidelines CliffsNotes AP Chemistry 2021 Exam - Angela Woodward Spangenberg 2020-09-29 CliffsNotes AP Chemistry 2021 Exam gives you exactly what you need to score a 5 on the exam: concise chapter reviews on every AP Chemistry subject, in-depth laboratory investigations, and full-length model practiceAs we delve into each chapter, you'll discover proven techniques to tackle various Ap Chem Exam Frq 2023, master time management, and overcome exam anxiety. With real-world examples and case studies, Ap Chem Exam Frq 2023 goes beyond conventional study materials, offering a holistic approach to Ap Chem Exam Frq 2023. The journey doesn't end ...Directions: Questions 1 and 2 are long free-response questions that require about 25 minutes each to answer. Questions 3 through 6 are short free-response questions that require about 10 minutes each to answer. Read each question carefully and completely. Answers must be written out in paragraph form.

Scoring AP Chemistry Free Response Questions - An AP Chemistry Mock Reading Mark as Favorite (0 Favorites) WEBINAR (95 minutes) recorded April 21, 2020 You sit down to score your students' answers to an AP Chemistry free response question (FRQ) with the College Board scoring guidelines at hand.B&G Foods (BGS) piques the interest of value investor Jonathan Heller but has yet to whet his appetite enough to buy, as he writes that the company behind a diverse roster ...These official exams come from before 2013 (when significant changes were made to the AP Chemistry curriculum), so they're formatted slightly differently from the current test. They have 75 multiple-choice questions (there are now 60) and six free-response questions (there are now seven). There are also five answer choices for each multiple ...1. Benzoic acid, C6H5COOH, dissociates in water as shown in the equation above. A 25.0 mL sample of an aqueous solution of pure benzoic acid is titrated using standardized 0.150 M NaOH. (a) After addition of 15.0 mL of the 0.150 M NaOH, the pH of the resulting solution is 4.37. Calculate each of the following.AP® Chemistry 2023 Scoring Guidelines. Question 4: Short Answer. 4 points. For the correct calculated value: 0.00250 mol CH 3 NH 3 Cl × 67.52 g 1 mol = 0.169 g. 1 point. (b) For a correct description of step 1:Here are also some sample student FRQ responses and grading commentary from the latest AP Chemistry exam in 2023. Once you use our AP Chem Score Calculator alongside your practice tests, you’ll be able to gauge just how well you’ll score on the big day. AP Chem Formula Sheet and AP Chem Reference Table Computer Science A 2023 Free-Response Questions The AppointmentBook class contains two helper methods, isMinuteFree and reserveBlock. You will write two additional methods of the AppointmentBook class. public class AppointmentBook { /** * Returns true if minute in period is available for an appointment and returns * false otherwise * In this video, we’ll unpack a sample free-response question—FRQ (Short).Download questions here: https://tinyurl.com/yhd8vwabStay motivated and keep preparin...

The course will open on March 1st 2023. What? A comprehensive review of the Learning Objectives from the AP Chemistry Course, with guided reading from the AP Chemistry Crash Course book, example questions, hints and tips, a full mock exam with answers, and much more. Most of the modules involve some reading, accompanied by open discussion ...AP Chemistry 2022 FRQs - Answers. #1. a) 0.300 g methyl sal. * 1 mol methyl sal. / 152.15 g methyl sal. = 0.00197 moles. 1 mole methyl sal. for every 1 mole sal. acid. 0.00197 mol sal. acid * 138.12 g / 1 mol sal. acid = 0.272 g sal. acid. b) No. 2.2 g/L is an extremely low solubility. With the sparing amount of water that was used to rinse ...Learn AP Chemistry using videos, articles, and AP-aligned practice. Review the fundamentals of atomic structure, intermolecular forces and bonding, chemical reactions, kinetics, thermodynamics, and equilibrium.The AP Chemistry exam assesses your ability to understand science practices in relation to four big ideas: scale, proportion and quantity; structure and properties; transformations; and energy. The exam is 3 hours and 15 minutes long and is comprised of two separate sections: Section I: Multiple Choice Questions. 60 questions.

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AP® Chemistry 2003 Scoring Guidelines. The materials included in these files are intended for use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities for noncommercial, face-to-face teaching ...Electrochemistry - Essential Knowledge 3.C.3. Electrochemical reactions, as the name implies, classify chemical reactions that involve the flow of electricity. In other words, they involve the movement of electrons from one substance to another. This movement of electrons is more commonly referred to as an electrical current.Assessment Overview. The AP Chemistry Exam assesses student understanding of the science practices and learning objectives outlined in the course framework. The exam is 3 hours and 15 minutes long and includes 60 multiple-choice questions and 7 free-response questions. Starting with the 2022-23 school year (spring 2023 exam), a scientific or ...In this video, Mr. Krug does a step-by-step walkthrough of FRQ #6 on the 2023 AP Chemistry Exam.0:00 Introduction0:49 Problem Walkthrough.Stop working and put your pencil down. Close your exam booklet and put your answer sheet faceup on your desk. Make sure your AP ID label and AP Exam label are on your answer sheet. Sit quietly while I collect your answer sheets. Collect an …Title: AP Chemistry Scoring Guidelines from the 2019 Exam Administration Author: College Board Subject: AP Chemistry Scoring Guidelines from the 2019 Exam Administration

The AP Chemistry exam lasts 3 hours and 15 minutes. Section I contains 60 multiple-choice questions. You will have 1 hour and 30 minutes to complete this section. Section II of the exam consists of 7 free-response questions with a time limit of 1 hour and 45 minutes.E° = ^(reduced species) - E°(oxidized species) = 1.36 V - 1.07 V = +0.29 V. Because E° for the reaction has a positive value, the reaction is thermodynamically favorable. point is earned for the correct balanced equation. point is earned for the correct calculation of E°. Br2 and Cl2 can react to form the compound BrCl.Check out this detailed article about the AP Chem Exam; why to take it, prerequisites, difficulty, and what’s on the exam. An expert’s guide to answering each type of free-response question in the AP® Chemistry FRQ section — including sample questions and exam-winning strategies!Directions: You have 1 hour and 40 minutes to answer all four of the following questions. It is suggested that you spend approximately 20 minutes each on Questions 1, 2, and 3 and 40 minutes on Question 4. Unless directions indicate otherwise, respond to all parts of all four questions. In your response, use substantive examples where appropriate.In the summer of 2022, Materials Chemistry Frontiers was pleased to launch an ongoing Emerging Investigators themed issue to highlight the best research being …Include units with your answer. q = mc T = (110.0 g)(4.18 J/(g·°C))(35.6°C 15.0°C) 1 point is earned for the correct setup. 1 point is earned for the = 9,470 J = 9.47 kJ correct answer with units. (ii) Determine the value of Hsoln for LiCl in kJ/molrxn. point is … Write your solution to each part in the space provided for that part. 6. Consider the curve given by the equation 6xy y. = 2 + . dy y. (a) Show that 2 . dx = y2 − 2x. (b) Find the coordinates of a point on the curve at which the line tangent to the curve is horizontal, or explain why no such point exists. United States History 2023 Free-Response Questions "[The Standard Oil Trust] is the most perfectly developed trust in existence. . . . The perfection of the organization of [it], the ability and daring with which it has carried out its projects, make it the preeminent trust of the world. . . .Print all fields below except "Signature" and mail this completed form to AP Services, P.O. Box 6671, Princeton, NJ 08541-6671 or fax 610-290-8979. AP Services must receive this form by September 15 of the year you took the AP Exams. Fill in the circles next to the exams for which you are requesting your free-responses.The 2023 AP Exams will be administered as a paper-and-pencil test from May 1–5 and May 8–12. The only exceptions to this rule are for the AP Chinese and AP Japanese tests, which are administered on computer. If you're a student who's taking lots of AP classes and finds you have two tests scheduled at the same time on the same day, the ...

K = − log(6.3 × − 5 10 ) =. 4.20. 1 point. AP® Chemistry 2022 Scoring Guidelines. (h) For a curve that shows a correct starting and half-equivalence point, consistent with part (g): The curve starts at pH ≈ 3.11 and passes through the p K a calculated in part (g) at 5 mL . See example response below. 1 point.

Include units with your answer. q = mc T = (110.0 g)(4.18 J/(g·°C))(35.6°C 15.0°C) 1 point is earned for the correct setup. 1 point is earned for the = 9,470 J = 9.47 kJ correct answer with units. (ii) Determine the value of Hsoln for LiCl in kJ/molrxn. point is earned for the number of moles of LiCl.Surviving Chemistry AP Exam - 2015 Effiong Eyo 2014-08-28 Surviving Chemistry AP Exam 2014 - 2015. Completely revised to fit the new AP Chemistry question, testing and scoring formats. . 14 Days of Practice Question sets.. 4 total new format AP Practice Exams . Easy to use Scoring Guidelines to all Free Response questions. .You have two hours to answer the six questions in this section. Questions 1 and 2 are long essay questions, and you are advised to spend one hour to answer these two questions. Questions 3 through 6 are short essay questions, and you are advised to spend 15 minutes on each. The proctor will announce when each time interval has elapsed, but you ...2023 Advanced Placement® Chemistry . About the AP® Chemistry Summer Institute . The focus of the instructional time will be on the four major essay topics - kinetics, equilibrium (gaseous, acid-base, and ... 11:00 - 11:45 Work on Thermo FRQ (Free Response Questions) 11:45 - 12:30. LUNCH. 12:30 - 1:00 Discussion of PES notes / Types of ...Key to symbols. HL = Higher level, SL = Standard level. M = Markscheme/marking notes. = Available in language indicated, = Available in English only. Paper titles in blue denote a link to the relevant listening comprehension audio track (MP3) HL. SL.In the summer of 2022, Materials Chemistry Frontiers was pleased to launch an ongoing Emerging Investigators themed issue to highlight the best research being …Include units with your answer. q = mc T = (110.0 g)(4.18 J/(g·°C))(35.6°C 15.0°C) 1 point is earned for the correct setup. 1 point is earned for the = 9,470 J = 9.47 kJ correct answer with units. (ii) Determine the value of Hsoln for LiCl in kJ/molrxn. point is earned for the number of moles of LiCl.2022 AP Exam Free Response Solutions. Updated: Jul 14, 2023. Here's my own PDF solutions for the 2022 AP exams. I only do AP Calculus, Statistics, and Physics.: If you're looking for help in AP Physics 1, check out a new course I've put together here AP Statistics AP Calculus AB/BC AP Physics 1 AP Physics 2 AP Physics C: Mechanics Set 1 Set 2 ...

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2023 AP Calculus BC Free Response Questions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May xx, 2023 1. (a) The integral Z 135 60 f(t)dtgives, in gallons, the amount of gas pumped into the gas tank during the time interval 60 t 135. This amount is given by Z 135 60 f(t)dt˘f(90) 30 + f(120 ...Get ratings and reviews for the top 11 gutter guard companies in Carrboro, NC. Helping you find the best gutter guard companies for the job. Expert Advice On Improving Your Home Al...Ap Chem Frq 2023 Princeton Review AP Chemistry Premium Prep, 2022 The Princeton Review 2021-08-03 Make sure you're studying with the most up-to-date prep materials! Look for the newest edition of this title, The Princeton Review AP Chemistry Premium Prep, 2023 (ISBN: 9780593450703, on-sale August 2022).2023 Ap Chem Frq Answers AP Chemistry 2021 and 2022 Test Prep Tpb Publishing 2020-12-16 Test Prep Books' AP Chemistry 2021 and 2022 Test Prep: AP Chem Review Book with Practice Exam Questions [2nd Edition Study Guide] Made by Test Prep Books experts for test takers trying to achieve a great score on the AP Chemistry exam. This comprehensive ...Apr 21, 2023 · To predict your possible AP Chemistry score, use the sliders below to adjust the 1 multiple-choice section and 7 free response questions. The curve for this score calculator is based on the most recently available scoring guidelines. You may also wish to check out our AP Biology score calculator. Section I: Multiple Choice. 30 /60. 0 /60 60 /60. ChemEd 2023 and the 2023 AP Chemistry released FRQ de-brief. When the College Board deliver their annual propaganda relating to the latest AP Chemistry exam and released FRQs, I like to be there in person to hear the information from the horse's mouth. That particular horse came in the form of three people this year, only...President Biden's student loan forgiveness plan includes $10,000 or $20,000 in student loan forgiveness. Here's what to know. The College Investor Student Loans, Investing, Buildin...Aug 3, 2023 · We then moved on to the 2023 released FRQ de-brief with chief examiner Kyle Beran. Over the years this has become decreasingly interesting since the questions themselves have become decreasingly interesting and decreasingly challenging. The numbers were as follows. Q1 – Average score 5.39. Q2 – Average score 5.22. ….

Ap Chem 2023 Frq Scoring Guidelines Introductory Statistics 2e (hardcover, Full Color) Barbara Illowsky 2023-12-14 Book Publication Date: Dec 13, 2023. Full color. Introductory Statistics 2e provides an engaging, practical, and thorough overview of the core concepts and skills taught in most one-semester statistics courses.You will only earn credit for what you write in the separate Free Response booklet. 1. (A) Describe regime. (B) Describe one difference between authoritarian regimes and democratic regimes. (C) Explain how authoritarian regimes maintain legitimacy. (D) Explain why citizens in an authoritarian regime would turn out to vote.Errors in the 2021 and 2022 AP Chemistry Chief Examiner's Reports. Feb 29, 2024. While I was recently updating the Mapped AP FRQ Worksheets to add the 2021, 2022 and 2023 FRQs, I came across multiple errors in the Chief Examiner's reports for 2021 and 2022.Directions: 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. For each question, show your work for each part in the space provided after that part.Note: Some questions and scoring guidelines from the 2023 and earlier AP U.S. Government and Politics Exams may not perfectly align with the course and exam updates that take effect in the 2023-24 school year. These questions remain available because teachers say that imperfectly aligned questions still provide instructional value.AP® Chemistry 2023 Scoring Guidelines. Question 4: Short Answer. 4 points. For the correct calculated value: 0.00250 mol CH 3 NH 3 Cl × 67.52 g 1 mol = 0.169 g. 1 point. (b) For a correct description of step 1:The triple ipso-defluoroetherification of (trifluoromethyl)alkenes with fluoroalkylated alcohols by C(sp3)–F bond cleavage is reported, delivering various …2023 Chem Frq 2023 VCE Chemistry Units 1&2 [2.1.1] Edrolo 2022-10-14 America's Lab Report National Research Council 2006-01-20 Laboratory experiences as a part of most U.S. high school science curricula have been taken for granted for decades, but they have rarely been carefully examined. What do they contribute to science learning? What can theyThese official exams come from before 2013 (when significant changes were made to the AP Chemistry curriculum), so they're formatted slightly differently from the current test. They have 75 multiple-choice questions (there are now 60) and six free-response questions (there are now seven). There are also five answer choices for each multiple ... 2023 chem frq, The triple ipso-defluoroetherification of (trifluoromethyl)alkenes with fluoroalkylated alcohols by C(sp3)–F bond cleavage is reported, delivering various …, Directions: Questions 1–3 are long free-response questions that require about 20 minutes each to answer and are worth 10 points each. Questions 4–7 are short free-response questions that require about 7 minutes each to answer and are worth 4 points each. Write your response in the space provided following each question., In this video, we’ll unpack a sample free-response question—FRQ (Long).Download questions here: https://tinyurl.com/537ttrj3Stay motivated and keep preparing..., Ap Chemistry Released Frq 2023 AP Chemistry Premium, 2024: 6 Practice Tests + Comprehensive Review + Online Practice Neil D. Jespersen 2023-07-04 For more than 80 years, BARRON's has been helping students achieve their goals. Prep for the AP® Chemistry exam with trusted review from our experts. Princeton Review AP Chemistry Premium Prep, 2023 ..., AP Chemistry: Free Response Practice Questions. The free-response section of the AP Chemistry Exam consists of 7 questions-3 long and 4 short-that you will have 90 minutes to answer. You should spend about 7 minutes on each short questions and 20 minutes on each long question. Try out the following two free response practice questions., Ap Chem Frq Answers 2023 serves as your mentor, providing detailed insights into exam formats, study strategies, and invaluable tips to not just pass but excel in Ap Chem Frq Answers 2023. As we delve into each chapter, you'll discover proven techniques to tackle various Ap Chem Frq Answers 2023, master time management, and, This AP® Chemistry review post will prepare you so that you can earn your best possible score. The AP® Chemistry exam is graded on a scale of 1-5, and you can earn college credits at many institutions for receiving a score as low as a 3, which is estimated to be a knowledge level on par with earning a C, C+, or B- in a college-level …, This AP® Chemistry review post will prepare you so that you can earn your best possible score. The AP® Chemistry exam is graded on a scale of 1-5, and you can earn college credits at many institutions for receiving a score as low as a 3, which is estimated to be a knowledge level on par with earning a C, C+, or B- in a college-level …, The FRQ section of the AP chemistry exam is graded manually by specially appointed college professors and experienced AP teachers. The FRQ section consists of four short answer questions worth 4 points each, and three long-response questions worth 10 points each. To learn more about AP Chem exam scoring, check out our AP Chemistry Exam …, 2023 Ap Chem Exam Frq 2023-ap-chem-exam-frq 3 Downloaded from dev.resolutioncopper.com on 2023-03-29 by guest immersive learning experience. 2023 Ap Chem Exam Frq is one of the best book in our library for free trial. We provide copy of 2023 Ap Chem Exam Frq in digital format, so the resources that you find are reliable. There are, Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. If you are using assistive technology and need help accessing these PDFs in another format, contact Services for Students with Disabilities at 212-713-8333 or by email at [email protected]. The ..., 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)., 2023 Ap Chem Exam Frq serve as a critical assessment of your understanding of fundamental concepts. Whether you're entering a new academic level or advancing in your career, these 2023 Ap Chem Exam Frq are the gateway to progress. Understanding their purpose and structure is the first step towards mastering, AP Central, Step 1: N2O5(g) → NO2(g) + NO3(g) Step 2: NO2 (g) + NO3 (g) → NO2(g) + NO(g) + O2(g) Step 3: N2O5(g) + NO(g) → 3NO2(g) Identify which step of the proposed mechanism (1, 2, or 3) is the rate-determining step. Justify your answer in terms of the rate law given. If this experiment was repeated at the same temperature but with twice the ..., Study with Quizlet and memorize flashcards containing terms like Which of the following reactions is not thermodynamically favored at low temperatures but becomes favored as the temperature increases?, For the reaction represented above, ΔGo has a value of -2.9 kJ/mol, which indicates that the reaction is thermodynamically favored. However, diamond is a stable substance that does not show any ..., 2023 AP ® Chemistry Sample Student Responses and Scoring Commentary © 2023 College Board. College Board, Advanced Placement, AP, AP Central, and the acorn logo …, 11.5K subscribers. Subscribed. 67. 9.1K views 10 months ago. In this video, Mr. Krug does a step-by-step walkthrough of Free-Response Question Number 5 on the …, H2(g) + I2(g) → 2 HI(g) For the exothermic reaction represented above, carried out at 298 K, the rate law is as follows. Rate = k[H2][I2] Predict the effect of each of the following changes on the initial rate of the reaction and explain your prediction. Addition of hydrogen gas at constant temperature and volume., Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. If you are using assistive technology and need help accessing these PDFs in another format, contact Services for Students with Disabilities at 212-713-8333 or by email at [email protected]., Mr. Ayton shows the solutions to the 2023 AP Chemistry Free Response #2 Check out www.mrayton.com for all your AP Chemistry needs, What is a good AP® Chemistry score? Scores of 3, 4, or 5 are considered “passing” scores on the AP® Chemistry Exam. The College Board describes a 3 as ‘qualified,’ 4 as ‘well qualified,’ and a 5 as ‘extremely well qualified.’. Scores of 3 or higher may qualify you for college credit, but many colleges and universities will ..., Include units with your answer. q = mc T = (110.0 g)(4.18 J/(g·°C))(35.6°C 15.0°C) 1 point is earned for the correct setup. 1 point is earned for the = 9,470 J = 9.47 kJ correct answer with units. (ii) Determine the value of Hsoln for LiCl in kJ/molrxn. point is …, Questions 1 and 2 are long free-response questions that require about 25 minutes each to answer. Questions 3 through 6 are short free-response questions that require about 10 minutes each to answer. Read each question carefully and completely. Answers must be written out in paragraph form., Starting with the Spring 2023 exam, a scientific or graphing calculator is recommend for both sections of the exam per the AP Exam Calculator Policy . Timing . Number of Questions ... Free Response . AP Chemistry free response questions assess your ability to: Explain, analyze, and interpret models and representations of chemical properties or ..., Here's my own PDF solutions for the released 2023 AP exams for AP Calculus, Statistics, and Physics. If you're looking for help in AP Physics 1, check out a new course I've put together here AP Statistics PDF SolutionYouTube SolutionsFRQ #1 FRQ #2 FRQ #3FRQ #4FRQ #5 FRQ #6AP Calculus ABPDF Solution (AB)PDF Solution (BC) …, On the following dots, representing the block in Trials and , draw and label the forces. Q 1 2. (not components) that are exerted on the block at the instant the block is released. Each force must be represented by a distinct arrow starting on, and pointing away from, the dot., AP Chemistry Exam 2023 Free Response Solved Answers!!! Direct Link - https:// afpr.co.in/solved-questio n-1-ap-chemistry-exam-2023-free-response/ … #apchemistry #apchemistryexam #apchemistryhelp #apchemistrystudyguide #apchemistryproblems #apchemistryteacher #apchemistrymemes #apchemistrytutor #apchemistrynotes #apchemistry2023, Physics 1 2023 Free-Response Questions . When the cart is at + L. and momentarily at rest, a block is dropped onto the cart, as shown in Figure 3. The block . sticks to the cart, and the block-cart-spring system continues to oscillate between −. L. and + L. The masses of the cart and the block are . m. 0. and 3. m. 0, respectively. (b), English Language and Composition 2023 Free-Response Questions Source C Kozai, Toyoki, and Genhua Niu. "Role of the Plant Factory with Artificial Lighting (PFAL) in Urban Areas." Plant Factory: An Indoor Vertical Farming System for Efficient Quality Food Production, edited by Toyoki Kozai et al., Elsevier, 2016, pp. 7-32., Ap Chem Exam Frq 2023 CliffsNotes AP Chemistry 2021 Exam Angela Woodward Spangenberg 2020-09-29 CliffsNotes AP Chemistry 2021 Exam gives you exactly what you need to score a 5 on the exam: concise chapter reviews on every AP Chemistry subject, in-depth laboratory investigations, and full-length model practice exams to prepare you for the May ..., Ap Chem Frq Answers 2023 Barron's AP Biology Deborah T. Goldberg 2017-08-30 Barron's AP Biology is one of the most popular test preparation guides around and a "must-have" manual for success on the Biology AP Test. In this updated book, test takers will find: Two full-length exams that follow the content and style of, Moles of CaCO3 = (1.00/100.09) = 0.0100 mols. ∆H° = -0.14 kJ/0.0100 mols = -14 kJ/molrxn (0.00250)(67.518) = 0.169 g. (b) Step 1: Place weighing paper on electronic balance and 'zero' (tare) the balance. Transfer the solid to the paper using the small spatula to a mass of 0.169 g. Step 4: Rinse buret with 0.100 M CH3NH2 solution and fill ...