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The set covers isotopic mass estimates, natural abundance, atom counting via sample masses, empirical formulas from molar quantities, balancing chemical equations and extracting coefficients, limiting-reagent stoichiometry for maximum water mass, density from water displacement, molecular formula possibilities, and electron–proton identity. Scoring guidance for AP Chemistry test sections and timed multi-pass strategy is included.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/unit-1-multiple-choice-practice-ap-chemistry-test-tips/461471/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/unit-1-multiple-choice-practice-ap-chemistry-test-tips/461471.png","ImageObject",300,407,{"name":92,"@type":93},"Bintang","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-05","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What assumptions should be used for all questions in this practice set?","Question",{"text":112,"@type":113},"Assume temperature is 298 K, pressure is 1.00 atmosphere, and solutions are aqueous unless otherwise specified.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Are calculators allowed during the multiple-choice practice?",{"text":117,"@type":113},"No calculators are allowed.",{"name":119,"@type":110,"acceptedAnswer":120},"How should you approach the multiple-choice section timing for the AP Chem test?",{"text":121,"@type":113},"Do three passes: about 30 seconds per question for confident answers, 60 seconds for questions needing some math, then 90 seconds to revisit unanswered items and guess if needed.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},461471,1790761683,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":52,"preview_page_count":4},962085564381,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Unit 1 Multiple Choice Practice  \nMultiple Choice: Use may use a periodic table. No calculators.  \nNote: For all questions, assume that the temperature is 298 K, the pressure is 1.00 atmosphere, and solutions are aqueous unless otherwise specified.  \nDirections: Each of the questions or incomplete statements below is followed by four suggested answers or completions. Select the one that is best in each case and then fill in the corresponding circle on the answer sheet.  \n1. An element has 3 naturally occurring isotopes as shown in the mass spectrum above. Which of the following best represents the estimated atomic mass of this element based on the data provided? What is the identity of the element?  \n(A)20.00 amu  \n(B) 20.24 amu  \n(C) 21.00 amu  \n(D)21.54 amu  \n2. The atomic mass of copper is 63.55 amu. Given that there are two naturally occurring isotopes of copper, 6329􀜥􀝑 and 6529􀜥􀝑 , the natural abundance of the 6529􀜥􀝑 isotope must be approximately  \n(A)10%  \n(B) 25%  \n(C) 50%  \n(D)70%  \n107.9 g of silver; 70.0 g of zinc; 21.0 g of magnesium  \n3. The masses of three samples of three metals is listed above. Which of the following correctly places the samples in order of decreasing number of atoms.  \n(A) Silver, zinc, magnesium  \n(B) Silver, magnesium, zinc  \n(C) Zinc, silver, magnesium  \n(D)Magnesium, silver, zinc  \n4. A compound contains 1.10 mol of K, 0.55 mol of C, and 1.65 mol of O. What is the empirical formula of this compound?  \n(A) KCO  \n(B) KC2O  \n(C) K2CO3  \n(D)K2CO6  \n(E) K4CO6  \n2 N2 H4 (g) + N2O4 (g) 􀃆 3 N2 (g) + 4 H2O(g)  \n5. When 8.0 g of N2 H4 (molar mass 32 g) and 92 g of N2O4 (molar mass 92 g) are mixed together and react according to the equation above, what is the maximum mass of H 2O that can be produced?  \n(A) 9.0 g  \n(B) 18 g  \n(C) 36 g  \n(D)72 g  \n(E) 144 g  \n… K3 PO4 (aq) + … Fe(NO3)2 (aq) 􀃆 … Fe3 (PO4)2 (s) + … KNO3 (aq)  \n6. What is the coefficient for KNO3 (aq) when the equation above is balanced with lowest whole-number integers?  \n(A) 1  \n(B) 2  \n(C) 4  \n(D)6  \n7. A measured mass of an unreactive metal was dropped into a small graduated cylinder half filled with water. The following measurements were made.  \n\n| Mass of metal | 19.611 g |\n| --- | --- |\n| Volume of water before addition of metal | 12.4 mL |\n| Volume of water after addition of metal | 14.9 mL |\n\nWhat is the density of the metal?  \n(A) 7.8444 g/mL  \n(B) 7.844 g/mL  \n(C) 7.84 g/mL  \n(D)7.8 g/mL  \n(E) 8 g/mL  \n8. The empirical formula for a compound is N2O. Which of the following could be a molecular formula for the compound?  \n(A) N3O  \n(B) N2O3  \n(C) N4O3  \n(D)N8O4  \n9. Potassium sulfide has a molar mass of 103 g/mol. How many moles of potassium sulfide are in a 51.5 g sample of potassium sulfide?  \n(A) 0.25 mol  \n(B) 0.50 mol  \n(C) 1.0 mol  \n(D)2.0 mol  \n(E) 6.0 x 1023 mol  \n10.A species with 11 protons and 10 electrons is  \n(A) Ne  \n(B) Na+  \n(C) F-  \n(D)Mg2+  \nHow AP Chem Test Grades are Scored  \nThere are two sections on the test: multiple choice and free response. Each section contributes 50% to your test grade.  \nMultiple Choice Tips:  \n􀁸 Each question is worth the same amount of points. Meaning that easy questions are worth just as much as more difficult questions, thus do not spend too long on any given question, there could be easier questions waiting at the end of the multiple choice.  \n􀁸 Do 3 passes of the questions:  \n1. 30 seconds/question. Answer all questions for which you are confident and can answer quickly. If you know how to answer the question, but will need several minutes to do calculations, put a star (*) next to the problem number and come back to it in pass 2. If you have no clue, circle the problem and come back to it in pass 3.  \n2. 60 seconds/question. Take the time to solve the questions you know how to answer, but require a bit of math. Skip the questions you have no clue how to answer.  \n3. 90 seconds/question. Return to the problems that you couldn’t get. Think harder. If you still have no clue, elimi","cbCaiat82GhYFsNY","https://ap.wps.com/l/cbCaiat82GhYFsNY","pdf",375120,"English","# Multiple Choice Practice\n## Questions 1-10\n# AP Chem Test Grades Scored\n## Scoring structure and test strategy\n## Multiple choice tips\n## Free response tips","[{\"question\":\"What assumptions should be used for all questions in this practice set?\",\"answer\":\"Assume temperature is 298 K, pressure is 1.00 atmosphere, and solutions are aqueous unless otherwise specified.\"},{\"question\":\"Are calculators allowed during the multiple-choice practice?\",\"answer\":\"No calculators are allowed.\"},{\"question\":\"How should you approach the multiple-choice section timing for the AP Chem test?\",\"answer\":\"Do three passes: about 30 seconds per question for confident answers, 60 seconds for questions needing some math, then 90 seconds to revisit unanswered items and guess if needed.\"}]","Unit 1 Multiple Choice Practice - AP Chemistry Test Tips | PDF"]