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Final exam - CHM1311 - Surname(last name Given name(First...

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Surname (last name): ___________________________________ Given name (First name): _________________________________ Student Number: __________________________________ Chemistry 1311 C Final Exam December 15, 2006 There are 18 pages in this exam. A periodic table and formula sheet are provided at the end. You may tear these pages off of the exam and use them to cover your work during the exam. Any scratch work should be on the back of the exam pages and should be handed in with your exam. Please show all work neatly to receive credit. You have 3 hours to complete the exam .
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Page Points Possible Points Earned 3 11 4 7 5 12 6 10 7 6 8 5 9 6 10 4 11 8 12 8 13 10 14 5 15 8 Total 100 2
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1. a)Write the noble gas core electron configuration of the following atoms and ions. Identify each a either paramagnetic or diamagnetic. I) (2 points) 42 Mo II) (2 points) 53 I - III) (2 points) 26 Fe 2+ b) How many upaired electrons are there in I) (1 point) B II) (1 point) Mn III) (1 point) F - c) (2 points) What are the quantum numbers for the highest energy electrons in Sn ? n = l = m l = m s= 3
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2. (7 points) A toxic cloud covered Bhopal, India in December 1984 when water leaked into a tank of methyl isocyanate (used in the production of pesticides), and the product escaped into the atmosphere. Draw Lewis structures for methyl isocyanate, CH 3 NCO, including all resonance forms. Calculate and show the formal charges for each atom in the molecules and, based on formal charg identify the “good” resonance structures. The skeletal arrangement of atoms is shown below: H H C H – N – C – O 4
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3. Draw the Lewis structure, and based upon Valence Shell Electron Pair Repulsion Theory determine the electron configuration and the shape of the following molecules. Identify them as po or non polar: a) (4 points) IF 3 (I is central) electron configuration:___________ molecular shaper:______________ polar?:_______________________ b) (4 points) KrF 4 (Kr is central) electron configuration:___________________ molecular shaper:_______________________ polar?:_______________________ c) (4 points) SCO (C is central) electron configuration:___________________ molecular shaper:_______________________ polar?:_______________________ 5
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4. The decomposition of ethanol, C 2 H 5 OH on alumina (Al 2 O 3 ) surface O(g) H (g)
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