[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-398046-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-398046-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","chemistry-sample-answers-placement-exam","Chemistry Sample Answers - Placement Exam","","Sample questions and answer explanations for a Chemistry Placement Exam, covering core concepts in chemistry and quantitative reasoning. The set includes topics such as chemical formula interpretation and ion charges, balancing chemical equations and determining coefficients, mole-to-stoichiometry calculations, periodic table classification of elements, acid–base behavior of common aqueous species, and significant-figure handling in multi-step calculations involving scientific notation.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/exam/","Exam",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/chemistry-sample-answers-placement-exam/398046/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/chemistry-sample-answers-placement-exam/398046.png","ImageObject",300,407,{"name":42,"@type":43},"\tJames","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-08","2026-09-27",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",10,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"How do you determine which element X makes Al2X3 electrically neutral?","Question",{"text":63,"@type":64},"Al forms a +3 ion, so the compound requires X to form a -2 ion. The only diatomic nonmetal that fits is oxygen, so X is oxygen.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What coefficient of O2 is needed to balance C2H4O + O2 → CO2 + H2O?",{"text":68,"@type":64},"When balanced, the equation is 2 C2H4O + 5 O2 → 4 CO2 + 4 H2O, so the coefficient of O2 is 5.",{"name":70,"@type":61,"acceptedAnswer":71},"How many moles of GeH4 are needed to form 8.00 moles of GeF3H?",{"text":72,"@type":64},"From GeH4 + 3GeF4 → 4 GeF3H, the mole ratio is 1 mol GeH4 per 4 mol GeF3H. Thus, 8.00 mol GeF3H requires 2.00 mol GeH4.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},398046,1790765934,{"code":4,"msg":82,"data":83},"success",[84,88,92,95,100,105,110,115,120,123,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":93,"slug":94},70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},6,"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":112,"show_sort_weight":113,"slug":114},8,"Research & Report",30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":55,"slug":125},"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":96,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":33,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":26,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":96,"preview_page_count":4},2336474466412,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Sample Questions for the Chemistry Placement Exam  \nNote: These questions are intended to represent the general level of difficulty and areas of coverage of the Chemistry Placement Exam.  \nThey are NOT intended to be a complete representation of the specific types of questions to be found on the exam.  \n1. Aluminum reacts with element X to form a compound with the formula Al2X3. Element X exists as diatomic molecules, X2 , in the gaseous state at normal temperature and pressure. Element X must be:  \na) Nitrogen b) Oxygen c) Sulfur d) Chlorine  \nExplanation: Aluminum forms a +3 ion. In order for the formula unit Al2X3 to be electrically neutral, the element X must form a-2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas.  \n2. What is the coefficient of O2 when the following equation is balanced? C2H4O + O2 → CO2 + H2O  \na) 2  \nb) 3  \nc) 4  \nd) 5  \nExplanation: The balanced equation is 2 C2H4O + 5 O2 → 4 CO2 + 4 H2O  \n3. How many moles of GeH4 are needed to form 8.00 moles of GeF3 H according to the following reaction?  \nGeH4 + 3GeF4 → 4 GeF3H  \na) 2.00 b) 4.00 c) 8.00 d) 16.00  \nExplanation: 8.00 mol GeF3H ( 1 mol GeH4/ 4 mol GeF3H) = 2.00 mol GeH4  \n4. According to its location in the periodic table, the element bromine (element \\# 35) is best described as:  \na) A metal  \nb) A nonmetal c) A transition metal d) A metalloid  \nExplanation: Nonmetals are toward the upper right of the periodic table. All the elements in the fluorine column are nonmetals.  \n5. Which of the following species is neither acidic nor basic when dissolved in water?  \na) HClb) NH3 c) NaCl d) NaHCO3  \nExplanation: HCl, hydrochloric acid, is a strong acid. NH3, ammonia, is a weak base. In a solution of NaHCO3, sodium hydrogen carbonate (baking soda), the hydrogen carbonate ion, HCO3- , acts as a base. Neither the sodium ion Na+ , nor the chloride ion, Cl - , which form when NaCl is dissolved in water, has significant acidic or basic properties.  \n6. To the correct number of significant figures, the result of the following calculation [(11 .13-2.6) x 104]/[103 .15 x 10-6] should be reported as:  \na) 8.27 x 108 b) 8.3 x 10-4 c) 8.3 x 108 d) 8.27 x 10-8  \nExplanation: The \"calculator answer\" is 8.2695   x 108 . When the numbers in the numerator are subtracted the result, 8.53, must be rounded to one decimal place, or 8.5. Since this number has two significant figures, the result when it is divided by a number with 5 significant figures is limited to two significant figures.","cbCais3pCa6Oaxdw","https://ap.wps.com/l/cbCais3pCa6Oaxdw","pdf",209824,"English","# Sample Questions for the Chemistry Placement Exam\n## Question 1 - Element and compound ions\n## Question 2 - Balanced equation coefficient\n## Question 3 - Moles and reaction stoichiometry\n## Question 4 - Periodic table classification\n## Question 5 - Acidic vs basic in water\n## Question 6 - Significant figures in calculations","[{\"question\":\"How do you determine which element X makes Al2X3 electrically neutral?\",\"answer\":\"Al forms a +3 ion, so the compound requires X to form a -2 ion. The only diatomic nonmetal that fits is oxygen, so X is oxygen.\"},{\"question\":\"What coefficient of O2 is needed to balance C2H4O + O2 → CO2 + H2O?\",\"answer\":\"When balanced, the equation is 2 C2H4O + 5 O2 → 4 CO2 + 4 H2O, so the coefficient of O2 is 5.\"},{\"question\":\"How many moles of GeH4 are needed to form 8.00 moles of GeF3H?\",\"answer\":\"From GeH4 + 3GeF4 → 4 GeF3H, the mole ratio is 1 mol GeH4 per 4 mol GeF3H. Thus, 8.00 mol GeF3H requires 2.00 mol GeH4.\"}]","Chemistry Sample Answers - Placement Exam | PDF",1790470082]