{"id":146932,"date":"2022-10-07T15:09:18","date_gmt":"2022-10-07T20:09:18","guid":{"rendered":"https:\/\/www.mometrix.com\/academy\/?page_id=146932"},"modified":"2026-08-03T11:22:33","modified_gmt":"2026-08-03T16:22:33","slug":"acs-general-chemistry-practice-test","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/acs-general-chemistry-practice-test\/","title":{"rendered":"ACS<sup>\u00ae<\/sup> General Chemistry Practice Test"},"content":{"rendered":"<p>The American Chemical Society (ACS<sup>\u00ae<\/sup>) is a nonprofit organization based in the US, whose goal is to support students, teachers, and general scientific advancements and research. If the college you attend offers an ACS-approved chemistry program, you may be required to take the ACS college chemistry exam as one of your final exams.<\/p>\n<p>Click \u201cStart Test\u201d above to take a free ACS General Chemistry practice test, and check out our premium-quality ACS General Chemistry study guide by clicking below!<\/p>\n<div class=\"buttonlinks\">\n<a href=\"https:\/\/www.mometrix.com\/university\/acs-general-chemistry\/\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Course Button', 'Course Click', ACSGenChem Course Click']);\">ACS General Chemistry Online Course<\/a><br \/>\n<a href=\"https:\/\/www.mometrix.com\/studyguides\/acschemistry\/\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Guide Button', 'Guide Click', 'ACSGenChem Guide Click']);\">ACS General Chemistry Study Guide<\/a><\/div>\n<h2 class=\"pt-page\"><span id=\"ACS_General_Chemistry_Exam_Outline\" class=\"m-toc-anchor\"><\/span>ACS General Chemistry Exam Outline<\/h2>\n<p>The ACS General Chemistry exam is administered in different formats, which vary by form: full-year, first-term, and second-term. Each form contains 70 multiple-choice questions with a 110\u2013112 minute time limit, while brief and conceptual forms use different question counts and time limits.<\/p>\n<p>These are the topics you should be familiar with before taking the ACS exam:<\/p>\n<details class=\"togglelist\">\n<summary>Basic Chemistry<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Vocabulary\/terminology<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Intermolecular Forces<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Lattice energy<\/li>\n<li>Phase transitions<\/li>\n<li>Phase diagrams<\/li>\n<li>Relation of boiling points and melting points to intermolecular forces<\/li>\n<li>Types of solids<\/li>\n<li>Unit cell calculations<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Types of Solutions<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Solution concentrations<\/li>\n<li>Solubility curves<\/li>\n<li>Colligative properties<\/li>\n<li>Colloids<\/li>\n<li>Solubility curves for gases vs. curves for solids<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Kinetics<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Experimental determination of rate<\/li>\n<li>Determining the rate law using the initial rate method<\/li>\n<li>Rate constants<\/li>\n<li>Elementary reactions<\/li>\n<li>Catalysis<\/li>\n<li>Reaction mechanisms<\/li>\n<li>Collision and transition state theory<\/li>\n<li>Activation energy, concentration-time calculations<\/li>\n<li>Temperature and rate<\/li>\n<li>Half-lives<\/li>\n<li>Graphical determinations of reaction order and rate constant<\/li>\n<li>Potential energy diagrams<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Chemical Equilibrium<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Equilibrium constant<\/li>\n<li>Reaction quotient<\/li>\n<li>Le Chatelier\u2019s Principle<\/li>\n<li>Predicting reaction direction<\/li>\n<li>Calculating equilibrium concentrations<\/li>\n<li>ICE tables<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Acid-base Theories<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Arrhenius and Br\u00f8nsted\u2013Lowry<\/li>\n<li>Acid-base strength and relation to molecular structure<\/li>\n<li>Self-ionization of water<\/li>\n<li>pH<\/li>\n<li>Strong and weak acids and bases<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Acid and Base Ionization<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Polyprotic acids<\/li>\n<li>Salt solutions<\/li>\n<li>Common ion effect<\/li>\n<li>Buffers<\/li>\n<li>Titration curves<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Solubility Product Constant<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Common ion effect<\/li>\n<li>pH and solubility<\/li>\n<li>Precipitation calculations<\/li>\n<li>Solubility rules (and exceptions to the rules)<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Second and Third Laws of Thermodynamics<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Entropy and change in entropy (\u2206S)<\/li>\n<li>Free energy and Gibbs free energy (\u2206G)<\/li>\n<li>Spontaneity<\/li>\n<li>Relation to the equilibrium constant<\/li>\n<li>Work<\/li>\n<li>Extensive property<\/li>\n<li>Enthalpy and change in enthalpy (\u2206H)<\/li>\n<li>Hess\u2019s Law<\/li>\n<li>Specific heat capacity<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Balancing Redox Reactions<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Voltaic and electrolytic cells<\/li>\n<li>Cell notation<\/li>\n<li>Electromagnetic fields<\/li>\n<li>Electrochemical cells<\/li>\n<li>Electrode potentials<\/li>\n<li>Oxidation numbers<\/li>\n<li>Oxidizing and reducing agents<\/li>\n<li>The strength of these agents<\/li>\n<li>Applications of electrochemistry<\/li>\n<li>Electrolysis<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Fission<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Fusion<\/li>\n<li>Radioactivity<\/li>\n<li>Nuclear bombardment reactions<\/li>\n<li>Radioactive decay<\/li>\n<li>Half-lives<\/li>\n<li>Mass-energy calculations<\/li>\n<li>Isotopes and nuclide symbols<\/li>\n<li>Mass numbers and atomic weights<\/li>\n<li>Subatomic particles<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Chemicals&#8217; Physical Change\/Properties<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Significant figures<\/li>\n<li>SI units and prefixes<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Nomenclature<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Polyatomic ions and Greek prefixes<\/li>\n<li>Molecular compounds<\/li>\n<li>Ionic compounds<\/li>\n<li>Acids<\/li>\n<li>Binary compounds<\/li>\n<li>Ion charge based on position in the periodic table<\/li>\n<li>Diatomic elements<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Combustion and Double Replacement Reactions<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Net ionic equations<\/li>\n<li>Spectator ions<\/li>\n<li>Molecular equations<\/li>\n<li>Gas-producing reactions<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Basic Stoichiometry<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Molar masses<\/li>\n<li>Molar ratios<\/li>\n<li>Limiting reactant<\/li>\n<li>Percent composition<\/li>\n<li>Molarity<\/li>\n<li>Percentage yield<\/li>\n<li>Empirical and molecular formulas<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Gas Laws<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Empirical<\/li>\n<li>Ideal<\/li>\n<li>Effusion<\/li>\n<li>Partial pressures<\/li>\n<li>STP<\/li>\n<li>Kinetic-molecular theory<\/li>\n<li>Barometers and manometers<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Energy<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Frequency<\/li>\n<li>Wavelength<\/li>\n<li>Emission spectra<\/li>\n<li>Electron configurations<\/li>\n<li>Orbital diagrams<\/li>\n<li>Quantum numbers<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Periodic Trends<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Atomic radii<\/li>\n<li>Ionization energies<\/li>\n<li>Electronegativities<\/li>\n<li>Ionic radii<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>Lewis Structures<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Resonance<\/li>\n<li>Formal charges<\/li>\n<li>Bond polarity<\/li>\n<li>Bond order<\/li>\n<li>Exceptions to the octet rule<\/li>\n<\/ul>\n<\/details>\n<details class=\"togglelist\">\n<summary>VSEPR Model<\/summary>\n<ul style=\"list-style-type: circle;\">\n<li>Hybridization<\/li>\n<li>Polarity of molecules<\/li>\n<li>Lone pairs<\/li>\n<li>Bonding pairs<\/li>\n<li>\u03c3 and \u03c0 bonds<\/li>\n<\/ul>\n<\/details>\n\n\t\t\t<div class=\"sg-box\">\n\t\t\t\t<div class=\"sg-box-text\">\n\t\t\t\t\t<p class=\"sg-box-title\">Check Out Mometrix's ACS General Chemistry Study Guide<\/p>\n\t\t\t\t\t<p>Get practice questions, video tutorials, and detailed study lessons<\/p>\n\t\t\t\t\t<a class=\"sg-box-button\" href=\"https:\/\/www.mometrix.com\/studyguides\/acschemistry\/\" target=\"_blank\" rel=\"noopener\">Get Your Study Guide<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t<a href=\"https:\/\/www.mometrix.com\/studyguides\/acschemistry\/\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"184\" height=\"238\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2025\/09\/acsgenchem.jpg\" alt=\" Study Guide\">\n\t\t\t\t<\/a>\n\t\t\t<\/div>\n<h2 class=\"pt-page\"><span id=\"Top_3_Most_Challenging_ACS_Chemistry_Questions\" class=\"m-toc-anchor\"><\/span>Top 3 Most Challenging ACS Chemistry Questions<\/h2>\n<p>Now that you know more about the test, try your hand at some targeted practice!<\/p>\n<p>Over the last year, we&#8217;ve compiled the data from about 6,000 test-takers who tried their hand at the practice test at the top of this page. According to the data, around 65% of people answered these three questions incorrectly.<\/p>\n<p>Answer each question and read through the answer explanation, whether you got the answer right or wrong. This will help you ensure you&#8217;ve got the topic mastered.<\/p>\n<p>Whether you struggled with these questions or aced them on your first try, be sure to take the <a class=\"ylist\" href=\"https:\/\/academy-pq.app.mometrix.com\/practicequestion\/products\/ACSGenChem\" target=\"_blank\">full practice test<\/a> to get a better idea of how prepared you really are!<\/p>\n<div style=\"margin-bottom: 1.5em; margin-top: 2em;\"><div class=\"acschem-question-container\">\r\n    <p class=\"acschem-question-text\">1. The solubility product (\\(K_{sp}\\)) of barium fluoride (BaF<sub>2<\/sub>) at 25\u00b0C is \\(1.7\\times 10^{-6}\\). What is the solubility of BaF<sub>2<\/sub>?<\/p>\r\n    \r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice1\" value=\"A\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;0.0075 g\/L<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice1\" value=\"B\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;0.023 g\/L<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice1\" value=\"C\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;2.1 g\/L<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice1\" value=\"D\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;1.3 g\/L<\/label>\r\n    <button class=\"acschem-submit-btn\" onclick=\"checkAnswer(1)\">Submit<\/button><br>\r\n    <div id=\"feedback1\" class=\"acschem-feedback-text\"><\/div>\r\n    <div id=\"explanation1\" class=\"acschem-explanation-text\">\r\nBarium fluoride dissolves according to the following equation:\r\n\r\n<p style=\"margin-top: 1em; text-align: center\">\\(\\text{BaF}_2(s)\\rightleftharpoons \\text{Ba}^{2+}(aq)+2\\text{F}^-(aq)\\)<\/p>\r\n\r\nLet \\(s\\) represent the molar solubility of BaF<sub>2<\/sub>. Based on the coefficients in the equation:\r\n\r\n<p style=\"margin-top: 1em; text-align: center\">\\([\\text{Ba}^{2+}]=s\\) and \\([\\text{F}^-]=2s\\)<\/p>\r\n\r\nSubstitute these concentrations into the solubility-product expression:\r\n\r\n<p style=\"margin-top: 1em; text-align: center\">\\(K_{sp}=[\\text{Ba}^{2+}][\\text{F}^-]^2=s(2s)^2=4s^3\\)<\/p>\r\n<p style=\"text-align: center\">\\(1.7\\times10^{-6}=4s^3\\)<\/p>\r\n<p style=\"text-align: center\">\\(s=\\sqrt[\\Large{3}]{\\frac{1.7\\times10^{-6}}{4}}\\normalsize{\\:\\approx 0.0075\\text{ mol\/L}}\\)<\/p>\r\n\r\nThe answer choices are given in grams per liter, so convert the molar solubility using the molar mass of BaF<sub>2<\/sub>, approximately 175.3 g\/mol:\r\n\r\n<p style=\"margin-top: 1em; text-align: center\">\\(0.0075\\text{ mol\/L}\\times175.3\\text{ g\/mol}\\approx1.3\\text{ g\/L}\\)<\/p>\r\n\r\nTherefore, the correct answer is D.\r\n\r\n<\/div>\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=ACS%20General%20Chemistry&prefill_Question+Number=1&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20ACS%20General%20Chemistry%20-%201&hide_Test=true&hide_Which+Form=true&hide_UP-ID=true&hide_Question+Number=true\" target=\"_blank\" rel=\"noopener\">Let us know!<\/a><\/div>\r\n<\/div><\/div>\n<div style=\"margin-bottom: 1.5em;\"><div class=\"acschem-question-container\">\r\n    <p class=\"acschem-question-text\">2. A reaction is experimentally determined to have a change of enthalpy (\\(\\Delta H\\)) of \u2013327.1 kJ at \u201315.0\u00b0C. Calculate the entropy change brought by this reaction to the surroundings at the given temperature.<\/p>\r\n\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice2\" value=\"A\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;+1.27  kJ\/K<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice2\" value=\"B\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;-1.27  kJ\/K<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice2\" value=\"C\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;+21.8  kJ\/(\u00b0C)<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice2\" value=\"D\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;-21.8  kJ\/(\u00b0C)<\/label>\r\n    <button class=\"acschem-submit-btn\" onclick=\"checkAnswer(2)\">Submit<\/button><br>\r\n    <div id=\"feedback2\" class=\"acschem-feedback-text\"><\/div>\r\n    <div id=\"explanation2\" class=\"acschem-explanation-text\">\r\nThe entropy change of the surroundings caused by a system has the opposite sign of the enthalpy change of the system. In this case, the system is the reaction:\r\n\r\n<p style=\"margin-top: 1em; text-align: center;\">\\(\\Delta S_{\\text{surr}}=\\dfrac{-\\Delta H_{\\text{sys}}}{T}=\\dfrac{-\\Delta H_{\\text{rxn}}}{T}\\)<\/p>\r\n\r\nThe temperature in this equation must be expressed in kelvin. Substituting the values of \\(\\Delta H\\) and \\(T\\) into the equation:\r\n\r\n<p class=\"longmath\" style=\"margin-top: 1em; text-align: center;\">\\(\\Delta S_{\\text{surr}}=\\dfrac{-\\Delta H_{\\text{rxn}}}{T}=-\\dfrac{-327.1\\text{ kJ}}{(-15.0+273.15)\\text{ K}}=+1.27\\text{ kJ\/K}\\)<\/p>\r\n\r\nA positive value of \\(\\Delta S_{\\text{surr}}\\) means that the entropy of the surroundings increases.\r\n\r\n<\/div>\r\n\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=ACS%20General%20Chemistry&prefill_Question+Number=2&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20ACS%20General%20Chemistry%20-%201&hide_Test=true&hide_Which+Form=true&hide_UP-ID=true&hide_Question+Number=true\" target=\"_blank\" rel=\"noopener\">Let us know!<\/a><\/div>\r\n<\/div><\/div>\n<div style=\"margin-bottom: 3.5em;\"><div class=\"acschem-question-container\">\r\n    <p class=\"acschem-question-text\">3. The equation below is the unbalanced chemical equation for the reaction between sodium metal and water. How many moles of hydrogen gas are produced if one mole of water takes part in the reaction?<\/p>\r\n\r\n<div class=\"acschem-blockquote longmath\">\\(\\text{Na}(s)+\\text{H}_2 \\text{O}(l)\\to \\text{NaOH}(aq)+\\text{H}_2 (g)\\)<\/div>\r\n\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice3\" value=\"A\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;0.5<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice3\" value=\"B\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;1<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice3\" value=\"C\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;2<\/label>\r\n    <label class=\"acschem-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice3\" value=\"D\" class=\"acschem-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;4<\/label>\r\n    <button class=\"acschem-submit-btn\" onclick=\"checkAnswer(3)\">Submit<\/button><br>\r\n    <div id=\"feedback3\" class=\"acschem-feedback-text\"><\/div>\r\n    <div id=\"explanation3\" class=\"acschem-explanation-text\">\r\nThe number of H atoms in the reactants is even, but the number of H atoms in the products is odd. One way to start the balancing process is to multiply the number of NaOH molecules by 2. The product side then has four H atoms in total: two from the NaOH, and two from the H<sub>2<\/sub>. \r\n<br>\r\n<br>\r\nThe reactant side only has two H atoms to start with, so the number of water molecules also needs to be multiplied by 2, to make the number of H atoms on the reactant side equal to 4:\r\n\r\n<p class=\"longmath\" style=\"margin-top: 1em; text-align: center;\">\\(\\text{Na}(s)+2 \\text{H}_2 \\text{O}(l)\\to 2 \\text{NaOH}(aq)+\\text{H}_2 (g)\\)<\/p>\r\n\r\nBalancing the H atoms also leaves the number of O atoms on both sides equal to 2. The last atom species to balance is Na. Since there are two Na atoms on the product side in NaOH, the number of Na atoms in the reactant should also be multiplied by 2. The final balanced equation is then:\r\n\r\n<p class=\"longmath\" style=\"margin-top: 1em; text-align: center;\">\\(2 \\text{Na}(s)+2 \\text{H}_2 \\text{O}(l)\\to 2 \\text{NaOH}(aq)+\\text{H}_2 (g)\\)<\/p>\r\n\r\nTherefore, the molar ratio between water and H<sub>2<\/sub> gas is 2\u22361. When 1 mole of water takes part in the reaction, 0.5 moles of H<sub>2<\/sub> gas is generated.\r\n\r\n<\/div>\r\n\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=ACS%20General%20Chemistry&prefill_Question+Number=3&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20ACS%20General%20Chemistry%20-%201&hide_Test=true&hide_Which+Form=true&hide_UP-ID=true&hide_Question+Number=true\" target=\"_blank\" rel=\"noopener\">Let us know!<\/a><\/div>\r\n<\/div><\/div>\n\n<h2 id=\"ACSGenChemCourse\" class=\"pt-page\"><span id=\"ACS_General_Chemistry_Online_Prep_Course\" class=\"m-toc-anchor\"><\/span>ACS General Chemistry Online Prep Course<\/h2>\n<p>If you want to be fully prepared, Mometrix offers an <strong>online ACS General Chemistry prep course<\/strong> designed to give you everything you need to succeed!<\/p>\n<p>Here&#8217;s what you&#8217;ll find in the ACS General Chemistry course:<\/p>\n<div class=\"mocblurb\"><ul>\n  <li class=\"moclessons\"><span class=\"moc-feature-text\">50+ Review Lessons Covering Every Topic<\/span><\/li>\n  <li class=\"mocpqs\"><span class=\"moc-feature-text\">350 ACS General Chemistry Practice Questions<\/span><\/li>\n  <li class=\"mocflash\"><span class=\"moc-feature-text\">300+ Digital Flashcards<\/span><\/li>\n  <li class=\"mocvideos\"><span class=\"moc-feature-text\">50+ Instructional Videos<\/span><\/li>\n  <li class=\"mocmoney\"><span class=\"moc-feature-text\">Money-back Guarantee<\/span><\/li>\n  <li class=\"mocmobile\"><span class=\"moc-feature-text\">Mobile Access<\/span><\/li>\n<\/ul><\/div>\n\n<p>Everyone learns differently, so we&#8217;ve tailored the ACS General Chemistry online prep course to ensure every learner has what they need to prepare for the ACS General Chemistry exam.<\/p>\n<p>Click below to check it out!<\/p>\n<div style=\"text-align: center;\"><a href=\"https:\/\/www.mometrix.com\/university\/acs-general-chemistry\/?utm_source=academy&amp;utm_medium=button&amp;utm_campaign=academy-mu-ads&amp;utm_content=acs-general-chemistry\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Course Button', 'Course Click', 'ACSGenChem Course Click']);\"><button class=\"buttontranscript\">Start Your ACS General Chemistry Online Course<\/button><\/a><\/div>\n<h2 class=\"pt-page\"><span id=\"Test_Day\" class=\"m-toc-anchor\"><\/span>Test Day<\/h2>\n<p>Depending on where you take the exam, you may be required to bring different items along with you, so check with the school administrators to ensure you&#8217;re prepared. Generally, you will be asked to bring two sharpened No. 2 pencils. A scratch piece of paper will be provided, and you are allowed to bring a non-programmable calculator if you would like.<\/p>\n<p>If you do not know how to answer a particular question, it is best to skip it and go back to it once you complete the questions you do know.<\/p>\n<h2 id=\"Ranking\" class=\"pt-page\"><span id=\"How_the_Exam_is_Scored\" class=\"m-toc-anchor\"><\/span>How the Exam is Scored<\/h2>\n<p>The ACS General Chemistry exam is scored using a raw score, as well as national norm data that compares the raw score with percentile performance. ACS Exams publishes abbreviated norms showing percentile rank as a function of raw score and overall test statistics.<\/p>\n<p>In percentile rankings, there is a good chance that the questions you do not know how to answer are also questions that several other students have trouble answering.<\/p>\n<p>With percentile rankings, the ranking you get, such as a 90th percentile, indicates that you scored higher than 90% of the students on the national norm.<\/p>\n<p>The chart below outlines the general percentile rankings estimated for the ACS test on a national level.<\/p>\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2022\/10\/Percentile-Rank-for-ACS-General-Chemistry-exam-scores.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-149428\" role=\"img\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2022\/10\/ACS-General-Chemistry-exam-percentile-rankings.svg\" alt=\"As a general estimation, the ACS general chemistry exam, a score of 36 places you in the 50th percentile, while a score of 65 places you in the 99th percentile\" width=\"616\" height=\"473\" \/><\/a><\/p>\n<p>Note that the methods used in grading this ACS exam will depend on the professor\u2019s preferences and the college guidelines for this type of grading. Some professors will use a curving method while grading, while others do not.<\/p>\n\n<h2 class=\"pt-page\"><span id=\"How_to_Study\" class=\"m-toc-anchor\"><\/span>How to Study<\/h2>\n<h3><span id=\"Start_with_a_Practice_Test\" class=\"m-toc-anchor\"><\/span>Start with a Practice Test<\/h3>\n<p>Before creating your study schedule, take an ACS General Chemistry practice test to establish a starting point. You don&#8217;t need to wait until you have reviewed every topic. At this stage, the goal is to identify where your preparation time will have the greatest effect.<\/p>\n<p>Review your results by topic:<\/p>\n<ul>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Atomic and Electronic Structure:<\/strong> Can you work with isotopes, electron configurations, quantum numbers, periodic trends, and relationships among atomic properties?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Formulas, Reactions, and Stoichiometry:<\/strong> Can you write and balance equations, convert among particles, moles, mass, and volume, identify limiting reactants, and calculate reaction yields?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Bonding and Molecular Structure:<\/strong> Can you draw Lewis structures, determine molecular geometry and polarity, compare bond types, and connect intermolecular forces with physical properties?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">States of Matter and Solutions:<\/strong> Can you apply gas laws, interpret phase behavior, calculate solution concentrations, and understand how solutes and solvents interact?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Thermochemistry and Thermodynamics:<\/strong> Can you interpret heat flow, enthalpy, entropy, free energy, calorimetry, and the signs associated with chemical and physical changes?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Kinetics and Equilibrium:<\/strong> Can you interpret rate information, determine how conditions affect a reaction, write equilibrium expressions, and apply equilibrium principles?<\/li>\n<li style=\"margin-bottom: 10px\"><strong style=\"font-weight: 600\">Acids, Bases, and Solubility:<\/strong> Can you calculate pH, compare acid and base strength, analyze buffers, and work with acid-base and solubility equilibria?<\/li>\n<li><strong style=\"font-weight: 600\">Electrochemistry and Nuclear Chemistry:<\/strong> Can you analyze oxidation-reduction reactions, electrochemical cells, radioactive decay, and related calculations?<\/li>\n<\/ul>\n<p>Identifying those specific weaknesses will show you where to devote more attention during your study time.<\/p>\n<h3><span id=\"Review_Difficult_Questions\" class=\"m-toc-anchor\"><\/span>Review Difficult Questions<\/h3>\n<p>After each practice session, review every question you answered incorrectly AND every question you guessed on or answered with low confidence. A correct guess does not demonstrate that you understand the chemistry.<\/p>\n<p>For each difficult question, determine which of the following caused the problem:<\/p>\n<ul>\n<li>You did not know the underlying concept or relationship.<\/li>\n<li>You recognized the topic but selected the wrong equation.<\/li>\n<li>You could not translate the wording, diagram, graph, or molecular representation into a workable problem.<\/li>\n<li>You failed to balance the equation before completing a stoichiometric calculation.<\/li>\n<li>You used the wrong units, conversion factor, sign, or significant figure.<\/li>\n<li>You confused two related ideas, such as reaction rate and equilibrium position.<\/li>\n<li>You completed the calculation correctly but interpreted the result incorrectly.<\/li>\n<li>You relied on calculator output without checking whether the answer was chemically reasonable.<\/li>\n<li>You understood the question but used a method that took too long.<\/li>\n<\/ul>\n<p>Then, outline a specific plan for improvement based on what you discovered. In other words, don&#8217;t just say, \u201cI need to study stoichiometry.\u201d Note that you need to practice identifying limiting reactants, converting from grams to moles, or using coefficients as mole ratios.<\/p>\n<p>Similarly, replace \u201creview acids and bases\u201d with a precise task such as distinguishing strong and weak acids, calculating the pH of a buffer, or predicting the direction of an acid-base reaction.<\/p>\n<h3><span id=\"Utilize_Answer_Explanations\" class=\"m-toc-anchor\"><\/span>Utilize Answer Explanations<\/h3>\n<p>Answer explanations are an underutilized studying resource. To take full advantage of them, read the explanation for every question you found difficult, including questions you answered correctly.<\/p>\n<p>For each one, make sure you can confidently explain:<\/p>\n<ol>\n<li>Why the correct answer is correct<\/li>\n<li>Why each incorrect option is wrong<\/li>\n<li>Which chemical principle, equation, or relationship is being tested<\/li>\n<li>Which information in the question is relevant<\/li>\n<li>How the answer can be checked for chemical and mathematical reasonableness<\/li>\n<li>How the same concept might appear in a different question<\/li>\n<\/ol>\n<p>Don&#8217;t just read the explanation, agree with it, and move on. Close it and solve the problem again from the beginning.<\/p>\n<p>For an equilibrium or acid-base question, write the appropriate expression before substituting numbers. Explain what the value represents and whether the result agrees with the expected direction of the chemical change.<\/p>\n<p>For a bonding question, draw the structure yourself and connect the arrangement of electrons to molecular geometry, polarity, and intermolecular forces.<\/p>\n<h3><span id=\"Study_Chemical_Relationships,_Not_Individual_Questions\" class=\"m-toc-anchor\"><\/span>Study Chemical Relationships, Not Individual Questions<\/h3>\n<p>Memorizing the answer to one practice question will not prepare you for a new question that presents the same chemistry through a different equation, graph, particle diagram, experiment, or set of values.<\/p>\n<p>For example, memorizing the ideal gas law is not enough. You should understand how pressure, volume, temperature, and amount of gas are related and recognize when a different gas-law relationship would be more efficient.<\/p>\n<p>Likewise, don&#8217;t memorize isolated periodic trends. Connect atomic structure to effective nuclear charge, atomic radius, ionization energy, electron affinity, bonding, and chemical behavior.<\/p>\n<p>The exact questions on your test will be different from the ones you encounter during practice. If you can explain a skill without looking at your notes and then apply it correctly to a new question, that is a good indication that you have mastered it.<\/p>\n<h2 class=\"pt-page\"><span id=\"FAQs\" class=\"m-toc-anchor\"><\/span>FAQs<\/h2>\n<div class=\"faq-list\">\n<div class=\"qa_wrap\">\n<div class=\"q_item text_bold\">\n<h4 class=\"letter\">Q<\/h4>\n<p style=\"line-height: unset;\">How many questions are on the ACS General Chemistry exam?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>There are 70 multiple-choice questions on the exam.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"qa_wrap\">\n<div class=\"q_item text_bold\">\n<h4 class=\"letter\">Q<\/h4>\n<p style=\"line-height: unset;\">How long is the ACS General Chemistry exam?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>The exam lasts a total of 110 minutes.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"qa_wrap\">\n<div class=\"q_item text_bold\">\n<h4 class=\"letter\">Q<\/h4>\n<p style=\"line-height: unset;\">What is a passing score on the ACS General Chemistry exam?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>The exam is generally scored using a <a class=\"ylist\" href=\"#Ranking\">percentile ranking system<\/a>. Your instructor or institution determines how your score converts to a course grade or passing threshold.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n\n<p><div itemscope=\"\" itemprop=\"author\" itemtype=\"http:\/\/schema.org\/Person\" class=\"author-bio\"><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" class=\"author-image\" height=\"127\" width=\"127\" alt=\"A bearded man with short dark hair stands indoors in front of a blurred bookshelf filled with books and decorative items.\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2026\/08\/about-us-tim.png\"><div class=\"author-text\"><p class=\"author-name\">By <span itemprop=\"name\">Tim Onken<\/span><\/p><div class=\"author-desc\"><p>Tim holds a BS in chemistry from LeTourneau University and a master\u2019s in statistics from the University of Houston\u2013Clear Lake. His academic background in chemistry, statistics, mathematics, physics, and the hard sciences supports his work on science-focused exam prep.<\/p>\n<\/div><\/div><\/div><div itemscope=\"\" itemprop=\"editor\" itemtype=\"http:\/\/schema.org\/Person\" class=\"author-bio\"><img loading=\"lazy\" decoding=\"async\" itemprop=\"image\" class=\"author-image\" height=\"127\" width=\"127\" alt=\"Aaron Lanni profile pic\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2024\/12\/image_2024-12-11_124906662.png\"><div class=\"author-text\"><p class=\"author-name\">Edited by <span itemprop=\"name\">Aaron Lanni<\/span><\/p><div class=\"author-desc\"><p>Aaron is the content manager and lead editor for Mometrix Academy. He regularly produces, updates, proofreads, and edits content to ensure it meets Mometrix\u2019s quality and accessibility standards.<\/p>\n<\/div><p class=\"alignright author-desc author-link\"><a class=\"ylist\" href=\"https:\/\/www.mometrix.com\/academy\/editorial-guidelines\/\">Learn more about our editorial guidelines<\/a> \u2192<\/p><\/div><\/div><\/p>\n<div class=\"home-buttons\">\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/\">Academy &#8211; Home<\/a><\/p>\n<\/div>\n<p class=\"disclaimer\">ACS is a registered trademark of the American Chemical Society, which is not affiliated with Mometrix Test Preparation and does not endorse this page.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The American Chemical Society (ACS\u00ae) is a nonprofit organization based in the US, whose goal is to support students, teachers, and general scientific advancements and research. If the college you attend offers an ACS-approved chemistry program, you may be required to take the ACS college chemistry exam as one of your final exams. Click \u201cStart &#8230; <a title=\"ACS\u00ae General Chemistry Practice Test\" class=\"read-more\" href=\"https:\/\/www.mometrix.com\/academy\/acs-general-chemistry-practice-test\/\" aria-label=\"Read more about ACS\u00ae General Chemistry Practice Test\">Read more<\/a><\/p>\n","protected":false},"author":19,"featured_media":271786,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":{"0":"post-146932","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"page_category-acs-genera-chemistry-pages","7":"page_category-course-pages","8":"page_category-long-math","9":"page_type-exam-overview","10":"page_domain-acs-general-chemistry"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Take a free ACS General Chemistry practice test with 60 questions covering key chemistry topics.\" \/>\n\t<meta name=\"robots\" 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