{"id":18341,"date":"2015-08-14T16:22:59","date_gmt":"2015-08-14T16:22:59","guid":{"rendered":"http:\/\/www.mometrix.com\/academy\/?page_id=18341"},"modified":"2026-07-21T11:24:57","modified_gmt":"2026-07-21T16:24:57","slug":"hesi-a2-chemistry-practice-test","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/hesi-a2-chemistry-practice-test\/","title":{"rendered":"HESI<sup>&reg;<\/sup> A2 Chemistry Practice Test"},"content":{"rendered":"<p>The HESI<sup>&reg;<\/sup> A2 Chemistry test covers various chemistry concepts, including atomic structure, equilibrium, stoichiometry, biochemistry, scientific notation, and chemical reactions. <\/p>\n<p>Click &#8220;Start Test&#8221; above to take a free HESI A2 Chemistry practice test!<\/p>\n<div class=\"buttonlinks\">\n<a href=\"https:\/\/www.mometrix.com\/university\/hesi?utm_source=academy&amp;utm_medium=button&amp;utm_campaign=academy-mu-ads&amp;utm_content=hesia2-test\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Course Button', 'Course Click', 'HESIA2 Course Click']);\">HESI A2 Online Course<\/a><br \/>\n<a href=\"https:\/\/www.mometrix.com\/academy\/hesi-a2-study-guide\/\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Guide Button', 'Guide Click', 'HESIA2 Guide Click']);\">HESI A2 Study Guide<\/a><br \/>\n<a href=\"https:\/\/www.flashcardsecrets.com\/hesi\/\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Flashcard Button', 'Flashcard Button Click', 'HESIA2 Flashcard Click']);\">HESI A2 Flashcards<\/a><\/div>\n<h2 class=\"pt-page\"><span id=\"What&#039;s_on_the_HESI_Chemistry_Test\" class=\"m-toc-anchor\"><\/span>What&#8217;s on the HESI Chemistry Test?<\/h2>\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2024\/08\/HESI-A2-Chemistry-Section-Outline.png\"><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2024\/08\/HESI-A2-Chemistry-Section-Outline.svg\" alt=\"A section outline for HESI A2 Chemistry showing 30 questions covering topics like scientific notation, metric system, periodic table, chemical reactions, stoichiometry, acids and bases, and biochemistry.\" width=\"550\" height=\"328.9\" class=\"aligncenter size-full wp-image-226480\" role=\"img\" \/><\/a><\/p>\n<h2 class=\"pt-page\"><span id=\"HESI_A2_Chemistry_Practice_Questions\" class=\"m-toc-anchor\"><\/span>HESI A2 Chemistry Practice Questions<\/h2>\n<p>One of the best ways to test your knowledge is by taking a practice test. Evaluate your chemistry knowledge by trying your hand at the three practice questions below!<\/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\/HESIA2PQ_Chemistry\" 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=\"hesi-question-container\">\r\n    <p class=\"hesi-question-text\">1. Which of the following substances allows for the fastest diffusion?<\/p>\r\n    \r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice7\" value=\"A\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;Gas<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice7\" value=\"B\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;Solid<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice7\" value=\"C\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;Liquid<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice7\" value=\"D\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;Gel<\/label>\r\n    <button class=\"hesi-submit-btn\" onclick=\"checkAnswer(7)\">Submit<\/button><br>\r\n    <div id=\"feedback7\" class=\"hesi-feedback-text\"><\/div>\r\n    <div id=\"explanation7\" class=\"hesi-explanation-text\">\r\nIn chemistry, diffusion is defined as the movement of matter from areas of high to low concentration by the random motion of molecules. Particle freedom positively correlates to speed of diffusion.\r\n<br>\r\n<br>\r\nDiffusion is fastest through gases because the particles move rapidly and have comparatively large amounts of space between them, allowing them to spread out. The next fastest medium for diffusion is liquid, followed by gel (semi-solid), and then solids. There is even some minuscule degree of diffusion in solids, which rises in proportion to the temperature of the substance.\r\n\r\n<\/div>\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=HESI%20Chemistry&prefill_Question+Number=1&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20HESI%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=\"hesi-question-container\">\r\n    <p class=\"hesi-question-text\">2. Which of the following could be an empirical formula?<\/p>\r\n    \r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice8\" value=\"A\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;C<sub style=\"margin-top: 1.5em\">4<\/sub>H<sub style=\"margin-top: 1.5em\">6<\/sub><\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice8\" value=\"B\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;C<sub style=\"margin-top: 1.5em\">2<\/sub>H<sub style=\"margin-top: 1.5em\">6<\/sub><\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice8\" value=\"C\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;C<sub style=\"margin-top: 1.5em\">5<\/sub>H<sub style=\"margin-top: 1.5em\">6<\/sub><\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice8\" value=\"D\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;C<sub style=\"margin-top: 1.5em\">3<\/sub>H<sub style=\"margin-top: 1.5em\">6<\/sub><\/label>\r\n    <button class=\"hesi-submit-btn\" onclick=\"checkAnswer(8)\">Submit<\/button><br>\r\n    <div id=\"feedback8\" class=\"hesi-feedback-text\"><\/div>\r\n    <div id=\"explanation8\" class=\"hesi-explanation-text\">\r\nAn empirical formula is the smallest expression of a chemical formula. To be empirical, a formula must be incapable of being reduced. For this reason, C<sub>4<\/sub>H<sub>6<\/sub>, C<sub>2<\/sub>H<sub>6<\/sub>, and C<sub>3<\/sub>H<sub>6<\/sub> are incorrect, as they could all be reduced to a simpler form (C<sub>2<\/sub>H<sub>3<\/sub>, CH<sub>3<\/sub>, and CH<sub>2<\/sub>, respectively).\r\n<br>\r\n<br>\r\nNote that empirical formulas are not the same as molecular formulas, which do not have to be irreducible. Two compounds can have the same empirical formula but different molecular formulas. The molecular formula is a description of the actual number of each atom in the molecule, not just their relative amounts.\r\n\r\n<\/div>\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=HESI%20Chemistry&prefill_Question+Number=2&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20HESI%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=\"hesi-question-container\">\r\n    <p class=\"hesi-question-text\">3. How is energy generated in a nuclear reaction?<\/p>\r\n    \r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice9\" value=\"A\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">A.<\/span>&nbsp;Conversion of matter into energy<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice9\" value=\"B\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">B. <\/span>&nbsp;Photon excitation and emission<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice9\" value=\"C\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">C. <\/span>&nbsp;Kinetic collision of highly energetic hydrogen atoms<\/label>\r\n    <label class=\"hesi-choice-label\" style=\"margin-bottom: 1em;\"><input type=\"radio\" name=\"choice9\" value=\"D\" class=\"hesi-choice-input\"> <span style=\"font-weight: 600;\">D. <\/span>&nbsp;Conversion od gravitational energy into electromagnetic radiation<\/label>\r\n    <button class=\"hesi-submit-btn\" onclick=\"checkAnswer(9)\">Submit<\/button><br>\r\n    <div id=\"feedback9\" class=\"hesi-feedback-text\"><\/div>\r\n    <div id=\"explanation9\" class=\"hesi-explanation-text\">\r\nIn a nuclear reaction, be it fission or fusion, matter is converted into energy. Einstein first postulated the law of energy-mass conservation using the equation \\(E=mc^2\\), where \\(m\\) is mass, \\(E\\) is energy and \\(c\\) is the speed of light. Looking closely at this equation shows that a tiny amount of matter can produce a large amount of energy, which is why nuclear reactions are so energetic.\r\n\r\n<\/div>\r\n <div class=\"bugreport\">Found a bug? <a class=\"ylist\" href=\"https:\/\/airtable.com\/appgcc1PP0BbzPCbI\/shr5gZ1gnO15kxPFw?prefill_Test=HESI%20Chemistry&prefill_Question+Number=3&prefill_Which+Form=General-IQ-Feedback&prefill_UP-ID=General-IQ-Feedback%20-%20HESI%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 class=\"pt-page\"><span id=\"HESI_A2_Online_Prep_Course\" class=\"m-toc-anchor\"><\/span>HESI A2 Online Prep Course<\/h2>\n<p>If you want to be fully prepared, Mometrix offers an online HESI prep course designed to give you everything you need to succeed!<\/p>\n<p>Here&#8217;s what you&#8217;ll find in the HESI A2 course:<\/p>\n<div class=\"mocblurb\"><ul>\n  <li class=\"moclessons\"><span class=\"moc-feature-text\">80+ Review Lessons Covering Every Topic<\/span><\/li>\n  <li class=\"mocpqs\"><span class=\"moc-feature-text\">Over 3,200 HESI A2 Practice Questions<\/span><\/li>\n  <li class=\"mocflash\"><span class=\"moc-feature-text\">550+ Digital Flashcards<\/span><\/li>\n  <li class=\"mocvideos\"><span class=\"moc-feature-text\">180+ 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 HESI online prep course to ensure every learner has what they need to prepare for the HESI exam.<\/p>\n<p>Click below to check it out!<\/p>\n<div class=\"buttonlinks\">\n<a href=\"https:\/\/www.mometrix.com\/university\/hesi?utm_source=academy&amp;utm_medium=copy&amp;utm_campaign=academy-mu-ads&amp;utm_content=hesia2-test\" class=\"class_names\" style=\"color:black;\" onclick=\"_paq.push(['trackEvent', 'Course Button', 'Course Click', 'HESIA2 Course Click']);\">Start your HESI A2 Online Course<\/a><\/div>\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 Chemistry section of the HESI A2?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>There are 30 questions on the Chemistry section of the HESI A2 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 Chemistry section of the HESI A2?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>Each school sets their own time limit for each section of 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;\">What is a passing score for the Chemistry section of the HESI A2?<\/p>\n<\/p><\/div>\n<div class=\"a_item\">\n<h4 class=\"letter text_bold\">A<\/h4>\n<p>There are no official passing scores or failing scores on the HESI exam.<\/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=\"Headshot of Kate Nockunas.\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2022\/06\/tinywow_tinywow_Kate-Nockunas-Cropped-min_24640345_24640389.webp\"><div class=\"author-text\"><p class=\"author-name\">By <span itemprop=\"name\">Kate Nockunas<\/span><\/p><div class=\"author-desc\"><p>Kate has been Mometrix\u2019s Nursing and Medical Editor for over four years. She has a bachelor\u2019s degree in Communications from Vanderbilt University, a bachelor\u2019s degree in Nursing from Marymount University, and a master\u2019s degree in Education from Johns Hopkins. Kate is a critical care registered nurse who still works occasionally in the ICU and PACU.<\/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\/hesi-a2-practice-test\/\">HESI A2 Practice Test Home<\/a><\/p>\n<\/div>\n<p class=\"disclaimer\">HESI is a registered trademark of Elsevier, Inc., which was not involved in the production of, and does not endorse, this page.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The HESI&reg; A2 Chemistry test covers various chemistry concepts, including atomic structure, equilibrium, stoichiometry, biochemistry, scientific notation, and chemical reactions. Click &#8220;Start Test&#8221; above to take a free HESI A2 Chemistry practice test! What&#8217;s on the HESI Chemistry Test? HESI A2 Chemistry Practice Questions One of the best ways to test your knowledge is by &#8230; <a title=\"HESI&reg; A2 Chemistry Practice Test\" class=\"read-more\" href=\"https:\/\/www.mometrix.com\/academy\/hesi-a2-chemistry-practice-test\/\" aria-label=\"Read more about HESI&reg; A2 Chemistry Practice Test\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":272020,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":{"0":"post-18341","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"page_category-course-pages","7":"page_category-hesi-advertising-group","8":"page_category-hesi-pages","9":"page_type-exam-overview","10":"page_domain-hesi-a2"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Test your knowledge of a wide variety of chemistry concepts using this free HESI A2 Chemistry practice test!\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.mometrix.com\/academy\/hesi-a2-chemistry-practice-test\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO Pro (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"|\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Free HESI A2 Chemistry Practice Test (updated 2026)\" \/>\n\t\t<meta property=\"og:description\" content=\"Test your knowledge of a wide variety of chemistry concepts using this free HESI A2 Chemistry practice test!\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.mometrix.com\/academy\/hesi-a2-chemistry-practice-test\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2025\/09\/HESI-A2-Chemistry-Practice-Test-scaled.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2025\/09\/HESI-A2-Chemistry-Practice-Test-scaled.png\" \/>\n\t\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t\t<meta property=\"og:image:height\" content=\"1344\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2015-08-14T16:22:59+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-07-21T16:24:57+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Free HESI A2 Chemistry Practice Test (updated 2026)\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Test your knowledge of a wide variety of chemistry concepts using this free HESI A2 Chemistry practice test!\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2025\/09\/HESI-A2-Chemistry-Practice-Test-scaled.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.mometrix.com\\\/academy\\\/hesi-a2-chemistry-practice-test\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.mometrix.com\\\/academy#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.mometrix.com\\\/academy\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.mometrix.com\\\/academy\\\/hesi-a2-chemistry-practice-test\\\/#listItem\",\"name\":\"HESI&reg; 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