Hardest ap chem questions

Concepts of Chemical Bonding. Lewis Structures Practice Problems. In these practice problems, we will work on determining the Lewis structures of molecules and ions. In short, remember these steps for determining the Lewis structure: 1. Write the correct skeletal structure for the molecule.

AP Chemistry is considered one of the hardest AP classes by AP class alumnae.; The course explores fundamental chemical concepts such as atomic structure, chemical reactions, and thermodynamics. AP Chemistry exams have an average pass rate of 54% which is lower than the average pass rate of other AP courses; The AP Chemistry Exam includes multiple-choice and free-response questionsQ14.1.6. In a typical laboratory setting, a reaction is carried out in a ventilated hood with air circulation provided by outside air. A student noticed that a reaction that gave a high yield of a product in the winter gave a low yield of that same product in the summer, even though his technique did not change and the reagents and concentrations used were identical. Factor 3: Content Difficulty. The content covered is, of course, a central factor that affects the difficulty of an AP course. Even if most students pass the exam, the class itself might be challenging because of the amount of ground it covers or because of the complexity of the material. 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 download th e material s an d mak e copies to ...21.4%. The AP Chemistry exam is a tough one to master, though many students do well enough to pass (which typically means earning a score of 3 or higher). In 2019, 55.6% of students who took the AP Chemistry exam received a score of 3 or higher. Of these, only 11.5% of students received the top score of 5 with another 16.6% scoring a 4.

Below is a table that ranks all of the difficult AP classes with the lowest exam passing rates. Based on these rates alone, Physics 1 is the hardest AP class. AP Course. Passing Rate. Average of Scores. Standard Deviation. Physics 1. 45.6%.The AP Chemistry Exam has consistent question types, weighting, and scoring guidelines every year, so you and your students know what to expect on exam day. Starting with the 2023 exam, a scientific or graphing calculator is recommended for use on both sections of the exam. Section I: Multiple Choice. 60 Questions | 1 Hour 30 minutes | 50% of ...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 download th e material s an d mak e copies to ...RELATED: What To Bring To AP Chemistry Exam (Solved) For more information about AP Chemistry be sure to download The Ultimate Guide to AP Chemistry by Pivot Tutors. Back to blog. PIVOT TUTORS. (858) 531-0508. 11300 Sorrento Valley Rd STE 101, San Diego, CA 92121. 16935 W. Bernardo Drive STE 207, Rancho Bernardo, CA 92129.Now that you know what topics will be covered in class and on the exam, we can begin explaining the AP chemistry questions. There are a total of sixty-seven questions on the AP chemistry exam. First, you will be asked to answer sixty multiple-choice questions in ninety minutes. ... Is 5 on AP chem hard? Only about 11% of all test-takers receive ...

Overview of the AP Macroeconomics Exam; 10 Hardest AP Macroeconomics Questions; Final Tips The AP Macroeconomics Exam is fairly tricky compared to other AP exams, with 63.3% of students receiving a score of 3 or higher in 2020 but only 19.7% of students receiving a 5. The exam requires students to complete difficult economics problems in a ...Here is a quick overview: Section 1: Multiple Choice Questions (MCQ) You have 90 minutes to answer 60 MCQs. This will count as 50% of your total exam score. A calculator is permitted in this section, starting with the 2023 exam. Section 2: Free Response Questions (FRQ) You have an hour and 45 minutes to answer 7 FRQs.It&rsquo;s our furry friends who are gonna have the hardest time adjusting to post-pandemic life. A life in which their humans return to their busy, over-scheduled lives and al...2024 AP Chemistry exam study guides, practice quizzes, live reviews, community support | Fiveable<p>Our teacher told us this is the hardest AP Chem equation balance question he’s ever come across. He gave our whole class an hour to do with no success. I have the answer now, but would like to test CollegeConfidential’s intelligence =). Lets seeee.</p> <p>Copper (I) sulfide plus hydrogen nitrate yields copper (II) nitrate plus copper (II) sulfate plus nitrogen dioxide plus water.</p> <p ...

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3. Chemistry: Here are the top 3 hardest AP classes starting with AP Chemistry. It's 3 hours & 15 minutes exam with 60 MCQs, 4 questions where you need to write short answers, and 3 essay questions. In this class, you will learn chemistry's fundamental concepts. It includes the intermolecular force and reaction, the state and structure of matter.The AP Chemistry Exam has a total of 67 questions. The exam is divided into two sections: Multiple-Choice and Free-Response. ... Despite being one of the hardest AP classes, AP Chemistry was still opted by 124,780 students in 2022 as it is one of the preferred AP courses of many competitive colleges/universities.AP® Chemistry is a challenging, college-level class. The curve is designed to account for the difficulty of this course and to provide an accurate assessment of the test-taker’s skills and knowledge. ... Albert has hundreds of AP-aligned AP® Chemistry practice questions and free response questions for you to study as you prepare for your AP ...It's crunch time now, so practicing exam-level questions is the best way to prepare for the AP chemistry exam. Here is an example AP-level question that tests one of the challenging concepts described above (from Unit 6). If you are interested in practicing with more questions like these before the exam, check out additional questions here.In the trips of yesteryear, renting a car may have been an afterthought to planning the rest of the journey. But in 2020, you need to flip that strategy on its head. In the hierarc...2. The five score rates: Another factor that can be considered is the percentage of students earning the highest possible score, 5s, on the AP test. Even though students might pass an AP test in large numbers, only a small group earns the highest score. This means that it is hard to be a true master in the subject.

ShortCalligrapher09. •. princeton review—i took ap chem sophomore year (last year) and princeton review helped the best. i got a 4 on the exam too using that book so i'd recommend princeton review! Reply. I'm taking ap chem next year and I plan to study over the summer and get a good hold on the concepts beforehand.Question 1 presents a suite of questions on the reactions and structure of methanoic acid, HCOOH. Part (a) asks the student to write the equilibrium constant expression for the acid ionization reaction of HCOOH. This question addresses Learning Objective SAP-9.C and Science Practice 5.B from the AP Chemistry Course and Exam Description.Honors chem gives you a good foundation, but AP chem is notoriously challenging so if you want to pass you'll have to put in the extra time to practice. Add a comment. So I have only taken a single AP test as a rising junior the AP WH exam and from that experience and that relayed to me by my teacher it largely depends on.Our AP Chem teachers put together the cheat sheet below to help explain some of the more challenging concepts on the exam. We pulled these based on our experience teaching AP Chem but also using our student performance data to find the most missed material. Unit 1: Atomic Structure and Properties. Periodic trends2019 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 points each.After overseeing franchises like 'World of Warcraft' and 'Candy Crush,' Activision COO Daniel Alegre will try to lead Yuga Labs into gaming. Activision Blizzard COO Daniel Alegre i...Whenever you're accept the AP Chemistry Exam, you'll want go know what difficult questions you should expect. Here are our tips forward getting a top score on your exam. If you're taking the AP Chemistry Exam, you'll want to know what difficult questions thee should expectant.Hey there! As someone who has taken AP Chemistry, I'll share my opinions, but keep in mind that this can depend on the student and their strengths. In my experience, a lot of students find the unit on equilibrium to be particularly challenging. This unit covers topics like chemical equilibrium, equilibrium constants, Le Chatelier's principle, and other …The AP Chemistry Exam has a total of 67 questions. The exam is divided into two sections: Multiple-Choice and Free-Response. ... Despite being one of the hardest AP classes, AP Chemistry was still opted by 124,780 students in 2022 as it is one of the preferred AP courses of many competitive colleges/universities.10 Hardest AP Chemistry Questions. In the five options above, OH-, CL-, NH2- and NH3 have electron pairs that are capable of donating their additional electrons to the Lewis acid AL(OH)3, SnCl4, NH4+ and H+ respectively. In option (b), H2O acts as a nucleophile and binds with Cl2 and breaks the intramolecular Cl2 bond. ...

The AP Chemistry course enables you to develop these skills and apply the concepts on the exam. The exam will test your understanding of the four big ideas1 for the course: Big Idea 1: Scale, Proportion, and Quantity. Big Idea 2: Structure and Properties of Substances. Big Idea 3: Transformations. Big Idea 4: Energy.

The last equation on that chart above is the ideal gas law: PV=nRT. The following information can be found on the AP Chemistry reference table, but it's quick and easy to memorize! P = pressure in atm. V = volume in L. n = moles of gas. R = universal gas constant (0.08206 Latm/molK) T = temperature in Kelvin. ⭐️.AP® Chemistry is a challenging, college-level class. The curve is designed to account for the difficulty of this course and to provide an accurate assessment of the test-taker’s skills and knowledge. ... Albert has hundreds of AP-aligned AP® Chemistry practice questions and free response questions for you to study as you prepare for your AP ...Summary: The Best AP® Chemistry Review Guide. We have covered a lot in this AP® Chemistry review guide, so let's regroup and summarize: Exam Structure: The exam will take 3 hours and 15 minutes to complete and is composed of a 90-minute AP® Chemistry multiple choice section and a 105-minute free-response section:Advanced Placement Chemistry: 1997 Free Response (and Answers) • Question 1 is question 4 in previous years, question 2 is question 1 in previous years and questions 3&4 are questions 2&3 in previous years. • students are now allowed 10 minutes to answer question 1, after which they must seal that portion of the test.We would like to show you a description here but the site won't allow us.AP Chemistry. Our extensive collection of resources is the perfect tool for students aiming to ace their exams and for teachers seeking reliable resources to support their students' learning journey. Here, you'll find an array of revision notes, topic questions, fully explained model answers, past exam papers and more, meticulously organized to ...Stoichiometry Practice Problems. This is a comprehensive, end-of-chapter set of practice problems on stoichiometry that covers balancing chemical equations, mole-ratio calculations, limiting reactants, and percent yield concepts. The links to the corresponding topics are given below. The Mole and Molar Mass.

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The AP Calculus BC Exam will have both paper and digital formats in 2021. The paper administration is held on May 4, 2021 and May 24, 2021: Section I: Multiple Choice, 50% of exam score. No calculator: 30 questions (60 minutes) Calculator: 15 questions (45 minutes) Section II: Free Response, 50% of exam score.The diagram below shows a galvanic cell based on the reaction. Assume that the temperature is 25°C. (d) The diagram includes a salt bridge that is filled with a saturated solution of KNO3. Describe what happens in the salt bridge as the cell operates. (e) Determine the value of the standard voltage, E°, for the cell.Practise Questions on Limiting Reagent. Q1. The reactant which is not consumed completely in the reaction is _____. Q2. In a reaction: – A + B 2 → AB 2. Identify the limiting reagent, if any, in the following reaction mixtures. (i) 300 atoms of A + 200 molecules of B. (ii) 2 mol A + 3 mol B. (iii) 100 atoms of A + 100 molecules of B.» Do AP Chemistry Practice Tests » Download AP Chemistry Practice Tests » Best AP Chemistry Books; More AP Tests. AP Chemistry Test 1; AP Chemistry Test 2; AP Chemistry Test 3; AP Chemistry Test 4; AP Chemistry Test 5; AP Chemistry Test 6; AP Chemistry Test 7; AP Chemistry Test 8; AP Chemistry Test 9; AP Chemistry Test 10; AP Chemistry Test ...DHrxn = -128 kJ. (a) Calculate the C-H bond energy given the following data: Bond D (kJ/mol) C∏O 1072 HπH 436 CπO 358 OπH 463. (b) The tabulated value of the (C-H) bond energy is 413 kJ/mol. Explain why there is a difference between the number you have calculated in (a) and the tabulated value. MULTIPLE CHOICE.This set of Tough Organic Chemistry Questions and Answers focuses on “Reagents in Organic Chemistry”. 1. Which is the suitable catalyst for bringing out the transformation given below? a) BF 3. Et 2 0. b) NaOEt. c) tungsten lamp. d) dibenzoyl peroxide. View Answer.This table shows the scores for AP® Chemistry from 2011 to 2016. For 2016, 53.6% of students earned a passing grade (3 or higher), and only 10.5% earned the top score of 5. The average score for 2016 was 2.69, and scores have been fairly consistent between 2014 and 2016.To properly write out the solutions for AP® Chemistry calculations, we need to provide the given data in the problem. These are: Chlorine: atomic number = 17 17. Isotope 1: abundance = 75.77\% 75.77%; neutrons = 18 18. Isotope 2: neutrons = 20 20 neutrons. In the problem, we are looking for the atomic mass of chlorine.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.To properly write out the solutions for AP® Chemistry calculations, we need to provide the given data in the problem. These are: Chlorine: atomic number = 17 17. Isotope 1: abundance = 75.77\% 75.77%; neutrons = 18 18. Isotope 2: neutrons = 20 20 neutrons. In the problem, we are looking for the atomic mass of chlorine.Even Stanley Druckenmiller is undisciplined and makes emotional decisions at times....HD Many traders and investors are having an extremely difficult time with the current market. ...CO2 + H2O → C6H12O6 + O2. The first step to balancing chemical equations is to focus on elements that only appear once on each side of the equation. Here, both carbon and hydrogen fit this requirement. So, we will start with carbon. There is only one atom of carbon on the left-hand side, but six on the right-hand side. ….

Overview of the AP Physics 1 Exam. The AP Physics 1 Exam consists of which following categories: Section I: Multiples Select. 50 multiple choice questions (1 hour, 30 minutes), 50% from exam score. Section II: Free Response. 5 free-response questions (1 hour, 30 minutes), 50% of assessment score. The multiple-choice section consists to both ...Organic Chemistry Practice Problems. The problem sets provided here are similar to those found on various kinds of standardized exams, such as GRE, ACS & MCAT. The questions are roughly organized by subject, and most sets have over 50 multiple choice problems. To use a problem set, click on its descriptive title.AP classes prepare learners to take tests on college-level knowledge in 38 subjects. Students can take AP classes in 38 areas, including English. Updated March 21, 2023 • 5 min rea...I think it's the hardest (maybe Chemistry, but I didn't take AP Chem) Easiest AP was hands down Human Geography. I think I'd actually have to try to score less than a 3 on the exam. Physics 1 was hard. World History was kinda easy but man not enough time to write the essays.8) AP Physics C: Electricity and Magnetism. Number of Students Taking Exam (2022): 19,978. % Scored a 3 or Higher: 55.1%. % Scored a 4 or 5: 69.4%. The self-selecting nature of Physics C (students should have previously taken calculus) explains its high pass rate, but the class itself is anything but easy.Chapter-wise Important Questions for Class 11 Chemistry. Chapter 1: Some Basic Concepts of Chemistry. Chapter 2: Structure of Atom. Chapter 3: Classification of Elements and Periodicity in Properties. Chapter 4: Chemical Bonding and Molecular Structure. Chapter 5: States of Matter. Chapter 6: Thermodynamics.: Get the latest NGL Fine-Chem stock price and detailed information including news, historical charts and realtime prices. Indices Commodities Currencies StocksThank you. for chemistry - it actually gets easier as the years progresses. if you want to try something hard you should go for the ones before 2016/17 all the way down to 2003. if you need more practice with your explaining skills, try O-Level papers instead of IGCSE papers (they're not the same) as there are more questions for you to do and ...3. Chemistry: Here are the top 3 hardest AP classes starting with AP Chemistry. It's 3 hours & 15 minutes exam with 60 MCQs, 4 questions where you need to write short answers, and 3 essay questions. In this class, you will learn chemistry's fundamental concepts. It includes the intermolecular force and reaction, the state and structure of matter.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 ... Hardest ap chem questions, so I came up with a list of units ranked easiest to hardest. let me know what you guys think and what units you thought were the easiest and hardest too. U7 Kinetics. already covered most of it in honors chem, so all that was new was just integrated rate law and the slow step stuff. U2 Molecular and ionic compound structure., Key Points: Amount of substance calculations account for a high proportion (33%) of difficult questions. Questions on practical chemistry consistently pose a significant challenge. Novel questions not seen on previous papers are a common source of difficulty. 6-mark level of response questions are frequently among the hardest …, There are two things to note before solving for the final temperature. 1. The density of water allows us to say that 300 milliliters of water is the same thing as 300 grams of water. 2. Since the heat from the iron is being transferred to the water, we can say that the heat transfer is equal between both compounds., The electric circuits unit just goes on and on forever. At least units like optics and thermodynamics are short. 2. Reply. 314K subscribers in the APStudents community. No matter what course you are taking, we are a community that helps students earn college credit!, 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., Question 1 presents a suite of questions on the reactions and structure of methanoic acid, HCOOH. Part (a) asks the student to write the equilibrium constant expression for the acid ionization reaction of HCOOH. This question addresses Learning Objective SAP-9.C and Science Practice 5.B from the AP Chemistry Course and Exam Description., Solving Stoichiometric Problems - Essential Knowledge 3.A.2. Example problem: Using the balanced equation from above, solve for the molar amount of oxygen consumed during the oxidation of 10.00 \text { grams} 10.00 grams of iron. We will use the unit cancellation method described previously to address this problem., Top 5 EASIEST and HARDEST AP Exams. When the question pops up, "Which AP classes are the easiest and which are the hardest?" I won’t lie to you – the answer …, The AP Chemistry exam is a 3 hour and 5 minute exam, in two parts. Part I is a 90 minute, 75 question multiple choice section. The second part consists of six short answer or open-ended questions, and lasts for 1 hour and 35 minutes. You may use a calculator only for certain questions in part II, and a periodic table is provided for both parts., 26 Apr 2019 ... Comments ; AP Chemistry Unit 9 - Thermodynamics and Electrochemistry. Nikles Chemistry · Playlist ; AP Chem Review Strategies. Jeremy Krug · ..., SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 17) ID: chem9b 6.1-90 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 18) D ID: chem9b 6.1-95 19) E ID: chem9b 6.1-103 20) A ID: chem9b 6.1-105 21) A, 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., What's Covered: How Will APC Scoring Impact Their College Chances? Overview in the AP Calc BC Exam; AP Calc BC Practice Ask; Final Tips The PRESS Calculus PC Exam history possesses a higher passage rate over other AP exams, at 81.3% of students receiving a score of 3 or higher in 2020 or 44.6% of students recipient a record of 5., Overview off the AP Chemicals Exam; 10 Hardest AP Chemistry Questions; Definite Tips In 2020, 56.1% starting test tender passed an AP Chemistry exam with a 3 or higher. As you can see, the AP Chemistry exam is one of the more difficult exams administered by the Institute Board., Antiphospholipid syndrome (APS) is an autoimmune disorder that involves frequent blood clots (thromboses). When you have this condition, your body's immune system makes abnormal pr..., Chemistry Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, NCERT Exemplar Questions and PDF Questions with answers, solutions, explanations, NCERT reference and difficulty level ... Hard ( 50% students solved correctly ) Question No. Please Select Chapter First ..., Google has removed yet another batch of awful Android apps from the Google Play Store for breaking the company’s terms of service. The roundup includes 101 apps belonging to a sing..., 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 points each., It&rsquo;s our furry friends who are gonna have the hardest time adjusting to post-pandemic life. A life in which their humans return to their busy, over-scheduled lives and al..., Exam Format. 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., AP CHEMISTRY GENERAL CHEMISTRY > Student Resources > Parent Resources AP Chemistry Exam Review Packets. Atomic Structure & Periodic Trends ... Kinetics Rate Laws Review Packet_Questions: File Size: 286 kb: File Type: pdf: Download File. Kinetics Rate Laws Review Packet_ANS KEY: File Size: 485 kb: File Type: pdf:, Cram for AP Chemistry Unit 4 - Topic 4.5 with study guides and practice quizzes to review Mole Concept, Limiting Reactants, Percent Yield, and more. ... Question 2. If you have 105.2 g of ethanol (C₂H₅OH), what is the maximum volume of carbon dioxide that can form at STP?, Do you have what it takes? Alternately, are you a masochist? Sometimes you want to melt away the hours managing an island of misfits and paying back a predatory raccoon. And someti..., The hardest part about studying from home is sticking to a routine. Decide on one hour every day that you can dedicate to studying. ... And don't miss out on unlimited access to our database of thousands of practice questions. Format of the 2024 AP Chemistry Exam. Going into test day, this is the exam format to expect:, The diagram below shows a galvanic cell based on the reaction. Assume that the temperature is 25°C. (d) The diagram includes a salt bridge that is filled with a saturated solution of KNO3. Describe what happens in the salt bridge as the cell operates. (e) Determine the value of the standard voltage, E°, for the cell., 500 AP-style questions and answers referenced to core AP materials; NEW! 20 Question Diagnostic Quiz to test your knowledge; Questions parallel the topic, format, and degree of difficulty of those in the AP exam, followed by answers with comprehensive, easy-to-understand explanations; Detailed review explanations for right and wrong answers, It's really a very subjective question. ... Your experience may very with teachers, but I found Chem to be the hardest ap class that I've taken. I have taken 12 ap classes over two years, and chem is responsible for my only B. At my school honors failed at preparing me for ap. I sailed through honors chem with an A+ while simply showing up and ..., Really understanding the concepts for this unit rather than just memorizing definitions is crucial because then you will be able to apply what you know to a system you haven't seen before. After learning the concepts, I suggest doing practice problems that mimic the AP exam to help test your understanding. I hope this helps! 6., When looking through AP exams with the highest pass rate, many students won't be entirely shocked to see that AP Chemistry is considered one of the hardest AP classes because of the academic rigor it entails. While only 29.5% of students score a 4/5 on the AP Chem exam, don't let that statistic intimidate you., If you're taking the AP Chemistry Exam, you'll wish to know what difficult questions you should expect. ... If you're fetching the ELEVEN-PLUS Chemistry Exam, you'll want to know how difficult questions you should expect. Here are our tips for getting a top grade on your exam. Trains. expand_more. Explore schools Rankings Best …, Solubility Equilibria. : Solubility equilibria refers to the balance that occurs when a solute dissolves in a solvent. It's the point at which the rate of dissolution equals the rate of precipitation, creating a saturated solution. Solubility Product. : The solubility product is a measure of the maximum amount of a substance that can dissolve ..., 2. The five score rates: Another factor that can be considered is the percentage of students earning the highest possible score, 5s, on the AP test. Even though students might pass an AP test in large numbers, only a small group earns the highest score. This means that it is hard to be a true master in the subject., Key Points: Amount of substance calculations account for a high proportion (33%) of difficult questions. Questions on practical chemistry consistently pose a significant challenge. Novel questions not seen on previous papers are a common source of difficulty. 6-mark level of response questions are frequently among the hardest questions on AS ...