Chem 123- 2010 Final - Key

Chem 123 2010 - Page 1 of 18 THE UNIVERSITY OF BRITISH COLUMBIA CHEMISTRY 123 FINAL EXAMINATION This examination consists of 18 numbered pages

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Page 1 of 18 THE UNIVERSITY OF BRITISH COLUMBIA CHEMISTRY 123 FINAL EXAMINATION 27 April 2010 This examination consists of 18 numbered pages. TIME LIMIT: PLEASE CHECK THAT YOU HAVE A COMPLETE PAPER 2.5 HOURS GIVEN NAME(S): __________ ANSWER KEY __________ SURNAME: ________________________________ (IN INK) (CAPITALS) (IN INK) STUDENT NUMBER: ________________________ SIGNATURE: _______________________________ (IN INK) (IN INK) The only calculator allowed is the Sharp EL-510R. All other calculators will be confiscated. Cell phones or other electronic communication devices are not permitted. Molecular models are allowed. Lecture Section (check your section) ___ 201 (MWF 1:00) Bizzotto/Love ___ 202 (MWF 2:00) MacFarlane/Ruddick ___ 203 (MWF 3:00) MacFarlane/Ruddick ___ 210 (MWF 10:00) Patey/Sherman ___ 211 (MWF 11:00) Patey/Sherman ___ 299 (T,Th 9:30) Monga ___ 266 (T,Th 11:00) Lekhi/Stewart ___ 222 (T,Th 2:00) Lekhi/Stewart REGULATIONS FOR EXAMINATIONS 1. Each candidate must be prepared to produce upon request, a Library/AMS card for identification. 2. Candidates are not permitted to ask questions of the invigilators, except in cases of supposed errors or ambiguities in examination questions. 3. No candidates shall be permitted to enter the examination room after the expiration of one half hour from the scheduled starting time, or to leave during the first half hour of the examination. 4. Candidates guilty of any of the following, or similar, dishonest practices shall be immediately dismissed from the examination and shall be liable to disciplinary action: (a) Having at the place of writing any books, papers or memoranda, calculators, audio or visual cassette players or other memory aid devices, other than those authorized by the examiners. (b) Speaking or communicating with other candidates. (c) Purposely exposing written papers to the view of other candidates. The plea of accident or forgetfulness shall not be received. 5. Candidates must not destroy or mutilate any examination mate- rial; must hand in all examination papers; and must not take any examination material from the examination room without permission of the invigilator. *ANSWER ALL QUESTIONS* Question Maximum Obtained Initials 1 6 2 10 3 16 4 6 5 2 6 3 7 2 8 3 9 4 10 16 11 20 12 10 13 12 TOTAL 110 *****ADDITIONAL DATA***** Attached (last page) is an Equation Sheet and a Periodic Table. You may carefully remove the last page.
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Page 2 of 18 1. [6 marks] Explain the following events using the concept of phase equilibria. You may use point form and include sketches, if you wish. a. An excited Science student explained the “ice drop” demonstration done in his Chemistry 123 class to his biochemistry professor, but forgot to explain why it worked. The Science student explained that in the “ice drop” demonstration a 1 L block of ice was placed on an ice block holder. Two metal weights (~20 lbs each) connected by a fine metal wire were hung over the ice block (see figure 1). After approximately 30 minutes, the weights crashed to the floor having passed through the ice block. The ice
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This note was uploaded on 02/05/2012 for the course CHEM 123 taught by Professor Bates during the Spring '11 term at BC.

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Chem 123 2010 - Page 1 of 18 THE UNIVERSITY OF BRITISH COLUMBIA CHEMISTRY 123 FINAL EXAMINATION This examination consists of 18 numbered pages

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