Final-2006(2) - Please print your name CHM3125 FINAL EXAM...

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Please print your name CHM3125 Family name: FINAL EXAM (50%) First name: 25-April-2006 Student #: Time allowed: 180 minutes NO BOOKS OR NOTES ALLOWED NO MOLECULAR MODELS ALLOWED CALCULATORS ALLOWED Question 1 2 3 4 5 6 7 8 Total Value 30 15 15 10 10 10 10 10 100 Mark Notes IMPORTANT : You must answer questions # 1, 2 and 3 You must answer 4 questions onl y from questions 4 to 8. Please indicate below which question you do NOT want marked. If you make no selection, question 8 will not be marked. Please do NOT mark question:
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CHM3125 Final Exam April 2006 page 2 of 15 1. (30 MARKS – stars show marks) Short Answer: no part marks. a) *The following monomers are polymerized using an appropriate method. Only one polymer will be soluble in water - circle the corresponding monomer. F F F F H 2 C CH 3 O OCH 3 Cl Si Me Cl Cl COOH b) **A transition metal is said to be in “coordinative saturation” when it has _________________________________ ligands and “electronically un saturated” when it has less than __________________ valence electrons. c) *Three samples of polypropylene with different tacticities have exactly the same molecular weight distribution but they have different Tg’s. Which has the highest Tg? ______________________________________________ d) *NaCl is added at a very high concentration to an aqueous solution of SDS. The surfactant molecules will aggregate to form SPHERICAL MICELLES MONOLAYER ROD-LIKE MICELLES e) *2.0 moles of isobutene, (CH 3 ) 2 C=CH 2 , are polymerized to completion using 0.001 mol of BF 3 , a Lewis acid, as the initiator. What would be the degree of polymerization? DP = _______________________ f) *Novolac polymers used in photolithography have the following structure. What is the purpose of the indicated methyl group? OH OH OH CH 3 CH 3 CH 3 ______________________________________________________________________________
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CHM3125 Final Exam April 2006 page 3 of 15 g) *CFC’s (chlorofluorocarbons) are banned world-wide because they (are) FLAMMABLE NEUROTOXIC DEPLETE OZONE h) **Kevlar has the following structure: HN O NH HN O O NH O What are the two interchain interactions that are responsible for Kevlar’s high degree of crystallinity? i. ____________________________________________ ii. ____________________________________________ i) *Polydimethylsiloxane (PDMS) is synthesized from a bifunctional silane, (CH 3 )SiCl 2 . What would be the effect on the polymer weight by adding small amounts of (CH 3 ) 3 SiCl to the polymerization reaction? ______________________________________________ j) *When you are looking outside through your window, you are exposed to: UVA UVB UVC X-RAYS k) *Synthetic rubber, used for tires and many other applications, is widely produced, yet it is not featured on the list of 6 recyclable polymers. Why is it not recyclable?
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Final-2006(2) - Please print your name CHM3125 FINAL EXAM...

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