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It includes significant digits and rounding, measurement conversions, subatomic counts using atomic notation, isotope neutron comparisons, electron energy transitions, and electron configuration for neutral atoms and ions. The exam also tests periodic trends, valence electrons, formula writing for ionic compounds, bonding types, gas laws and phase-diagram interpretation, stoichiometric mole calculations, and identifying electrolytes versus nonelectrolytes.",{"@graph":69,"@context":123},[70,84,106],{"@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/chemistry-challenge-practice-exam-1-multiple-choice-questions/331839/",{"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/chemistry-challenge-practice-exam-1-multiple-choice-questions/331839.png","ImageObject",300,407,{"name":92,"@type":93},"Jake","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-09-21",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",15,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What types of chemistry skills are evaluated in this practice exam?","Question",{"text":113,"@type":114},"It evaluates significant-digit measurement work, atomic structure and isotopes, electron configurations, periodic trends, chemical bonding and formulas, stoichiometry, gas law relationships, and phase-diagram interpretation.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How do the questions assess stoichiometry?",{"text":118,"@type":114},"They ask for mole conversions using Avogadro’s number, molar mass calculations, percent composition, and determining reaction coefficients and correct interpretations of balanced equations.",{"name":120,"@type":111,"acceptedAnswer":121},"Which topics are included beyond calculations?",{"text":122,"@type":114},"The exam includes electron energy transitions, whether elements form diatomic molecules, identifying ionic compounds, classifying electrolytes vs nonelectrolytes, and reading pressure/temperature behavior and phase coexistence on diagrams.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},331839,1790032296,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},962084928904,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Chemistry Challenge Practice Exam \\#1  \nMultiple Choice  \nIdentify the letter of the choice that best completes the statement or answers the question.  \n  1. Express the sum of 7.68 m and 5.0 m using the correct number of significant digits.  \na. 12.68 m c. 13 m  \nb. 12.7 m d. 10 m  \n  2. What is the measurement 111.009 mm rounded off to four significant digits?  \na. 111 mm c. 111.01 mm  \nb. 111.0 mm d. 110 mm  \n  3. Using the periodic table, determine the number of neutrons in 16 O.  \na. 4 c. 16  \nb. 8 d. 24  \n  4. Which of the following isotopes has the same number of neutrons as phosphorus-31?  \na. 32 P c 29 Si 15 . 14  \nb. 3216 S d. 2814 Si  \n  5. When an electron moves from a lower to a higher energy level, the electron   .  \na. always doubles its energy  \nb. absorbs a continuously variable amount of energy  \nc. absorbs a quantum of energy  \nd. moves closer to the nucleus  \n  6. What is the electron configuration of potassium?  \na. 1s2 2s22p 2 3s2 3p 24s 1 c. 1s2 2s2 3s2 3p 6 3d1  \nb. 1s2 2s22p 10 3s2 3p 3 d. 1s2 2s22p 6 3s2 3p 64s 1  \n  7. Which of the following elements is a transition metal?  \na. cesium c. tellurium  \nb. copper d. tin  \n  8. Atomic size generally   .  \na. increases as you move from left to right across a period  \nb. decreases as you move from top to bottom within a group  \nc. remains constant within a period  \nd. decreases as you move from left to right across a period  \n  9. Which of the following elements has the smallest first ionization energy?  \na. sodium c. potassium  \nb. calcium d. magnesium  \nChemistry Challenge Practice Exam \\#1  \n  10. Which of the following statements correctly compares the relative size of an ion to its neutral atom?  \na. The radius of an anion is greater than the radius of its neutral atom.  \nb. The radius of an anion is identical to the radius of its neutral atom.  \nc. The radius of a cation is greater than the radius of its neutral atom.  \nd. The radius of a cation is identical to the radius of its neutral atom.  \n  11. As you move from left to right across the second period of the periodic table   .  \na. ionization energy increases c. electronegativity decreases  \nb. atomic radii increase d. atomic mass decreases  \n  12. What is the electron configuration of the calcium ion?  \na. 1s2 2s22p 6 3s2 3p 6 c. 1s2 2s22p 6 3s2 3p 54s 1  \nb. 1s2 2s22p 6 3s2 3p 44s2 d. 1s2 2s22p 6 3s2  \n  13. How many valence electrons are in an atom of phosphorus?  \na. 2 c. 4  \nb. 3 d. 5  \n  14. How many valence electrons are in an atom of magnesium?  \na. 2 c. 4  \nb. 3 d. 5  \n  15. What is the formula unit of sodium nitride?  \na. NaN c. Na 3 N  \nb. Na 2 N d. NaN 3  \n  16. Which of the following compounds has the formula KNO 3 ?  \na. potassium nitrate c. potassium nitrite  \nb. potassium nitride d. potassium nitrogen oxide  \n  17. Which of these elements does not exist as a diatomic molecule?  \na. Ne c. H  \nb. F d. I  \n  18. A molecule with a single covalent bond is   .  \na. CO 2 c. CO  \nb. Cl 2 d. N 2  \n  19. Which of the following formulas represents an ionic compound?  \na. CS 2 c. N 2 O 4  \nb. BaI 2 d. PCl 3  \nChemistry Challenge Practice Exam \\#1  \n  20. Sulfur hexafluoride is an example of a   .  \na. monatomic ion c. binary compound  \nb. polyatomic ion d. polyatomic compound  \n  21. Which of the following compounds contains the lead(II) ion?  \na. PbO c. Pb2O  \nb. PbCl4 d. Pb2S  \n  22. Which of the following elements exists as a diatomic molecule?  \na. neon c. nitrogen  \nb. lithium d. sulfur  \n  23. How many moles of tungsten atoms are in 4.8 × 1025 atoms of tungsten?  \na. 8.0 × 102 moles c. 1.3 × 10 −1 moles  \nb. 8.0 × 10 1 moles d. 1.3 × 10 −2 moles  \n  24. How many moles of silver atoms are in 1.8 × 1020 atoms of silver?  \na. 3.0 × 10 −4 c. 3.0 × 102  \nb. 3.3 × 10 −3 d. 1.1 × 1044  \n  25. What is the molar mass of (NH 4 ) 2 CO 3 ?  \na. 144 g c. 96 g  \nb. 138 g d. 78 g  \n  26. What is the percent composition of carbon, in heptane, C 7 H 16 ?  \na. 12% c. 68%  \nb. 19% d. 84%  \n  27. Which of t","cbCaipyKybc1QEmM","https://ap.wps.com/l/cbCaipyKybc1QEmM","pdf",70023,"English","# Multiple Choice Section\n## Atomic Structure and Periodic Trends\n## Bonding, Formula Writing, and Ionic Compounds\n## Stoichiometry and Gas Laws\n## Phase Diagrams and Electrolytes","[{\"question\":\"What types of chemistry skills are evaluated in this practice exam?\",\"answer\":\"It evaluates significant-digit measurement work, atomic structure and isotopes, electron configurations, periodic trends, chemical bonding and formulas, stoichiometry, gas law relationships, and phase-diagram interpretation.\"},{\"question\":\"How do the questions assess stoichiometry?\",\"answer\":\"They ask for mole conversions using Avogadro’s number, molar mass calculations, percent composition, and determining reaction coefficients and correct interpretations of balanced equations.\"},{\"question\":\"Which topics are included beyond calculations?\",\"answer\":\"The exam includes electron energy transitions, whether elements form diatomic molecules, identifying ionic compounds, classifying electrolytes vs nonelectrolytes, and reading pressure/temperature behavior and phase coexistence on diagrams.\"}]","Chemistry Challenge Practice Exam - 1 - Multiple Choice Questions | PDF",1789995419,23]