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Department
Chemistry
Course
CHEM 1001
Professor
All Professors
Semester
Winter

Description
Final Examination April 2010CHEM 1000 A and VR BurkPage 1 of 12Part A Answer all eight questions 5 marks each231 The valence electrons in a Dubnium Db atom are 7s6d What are the four quantum numbers for each of these five electronsOne of the 7s electrons n7 l0 m0mlsThe other 7s electron n7 l0 m0m lsOne of the 6d electronsn6 l2 m 1m lsThe second 6d electronn6 l2 m0m lsThe third 6d electronn6 l2 m1m ls2 A carboncarbon triple bond is stronger than a carboncarbon single bond Why then is acetylene HCCH more reactive towards oxygen than ethane HCCH33The four electrons in the pibonds in acetylene are delocalized meaning that they are further away from the carbon nuclei and thus are easier to remove An oxidant such as oxygen will easily pull these electrons away from acetylene3Why do isotopes along the lower edge of the island of stability tend to decay by alpha a beta plus b or electron capture EC but not by beta minus bAlong the lower edge of the island of stability the np ratio is low Alpha beta plus b or electron capture EC decays result in an increase of this ratio which places the product isotope further into this island of stability More stabilitymore energy released so the products are at a lower energy which is favourable The opposite is true for beta minus b decay4 Why can sodium metal not be produced by electrolyzing a solution of NaClaqThe water in this solution is preferentially reduced because its reduction potential is higher than that of the sodium ions 5 Would the freezing point of 10 m CaCl be greater or less than that of 3 m aqueous 2aqglucose WhyBoth solution have a total molality of 3 m since the CaCl dissociates in water but ion pairing 2in the CaCl solution reduces this molaltiy slightly reducing the freezing point depression and 2so the CaCl solution will have a higher freezing point than the glucose solution26 Why is sulfuric acid HSO a stronger acid than sulfurous acid HSO24aq23aqFinal Examination April 2010CHEM 1000 A and VR BurkPage 2 of 12This is because the extra oxygen in HSO draws electrons away from the OH bond 24weakening this bond and causing the acid to be stronger7 In a reaction mechanism what is the difference between an intermediate and a catalystAn intermediate is produced in an early step and consumed in a later step A catalyst is consumed in an early step and reproduced in a later step8 Name five functional groups containing the carbonyl CO group Aldehyde ketone ester amide carboxylic acidPart B Answer all four questions B1 B2 B3 and B4 20 marks eachB1a 8 Balance the following nuclear reactions by filling in the blanks12351031152i nUMo2nSn092420502342340ii b or ThPae90911 163163iii nNipCo0281279999iv gTcTc434330 B1b P which has a halflife of 150 seconds decays by positron emission Given a sample 30containing 0100 g P1i 6 Calculate the decay rate sratekN0693Nt120100g069323160210mol150s30gmol181 9310s
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