Prelim_1_05 - Name_ (Last) (First) Cornell Student ID...

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1 Name________________________________ ( Last ) ( First ) Cornell Student ID Number________________________________ Lab Instructor’s Name________________________________ Lab Section (Day and Time)________________________________ Chemistry 207 Preliminary Examination 1 October 6, 2005 Time: 7:30 PM – 9:00 PM Please do not open the exam until told to do so. You have 1.5 hours to complete the exam. There are 7 questions in this exam plus a cover sheet and a periodic table, which also lists a number of constants and equations you may or may not require. Check to make sure you have a complete exam before beginning. Write directly on these pages. Answers alone are not enough – you should show all your work and indicate units where necessary . You may turn in the exam at the front of the room when finished. There are no aliens on this exam. Good luck! 1. (25) ______ 2. (25) ______ 3. (25) ______ 4. (25) ______ 5. (25) ______ 6. (25) ______ 7. (25) ______ TOTAL (175) ______
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3 1. (25 points) As promised, an elemental analysis problem! After 6 weeks of Chem 207 you have an upset stomach and decide to take Pepto-Bismol. You know from reading the bottle that the active ingredient contains at least three (there could be another) elements: C, H, Bi. Combustion of 0.22105 g of the active ingredient produced 0.1422 g of Bi 2 O 3 , 0.1880 g of CO 2 and 0.02750 g of water. What is the empirical formula of the compound?
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Prelim_1_05 - Name_ (Last) (First) Cornell Student ID...

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