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CHEM 412, Fall 2016 Homework #6 Due at the start of class Friday, October 21 Answer keys will be posted to the website. Late homework will be accepted after the due date, but before the answer key has been posted. Points will be deducted for homework submitted after the due date. Late homework cannot be accepted once the answer key has been posted. It is ok to do the homework in small groups of 2-3. If you do so, please indicate your study partners. Each person needs to submit her/his own version. Please do not submit homework electronically. Homework to be graded and counting toward your final grade starts on the next page:
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1. NMR spectroscopy The octahedral mer -[Ir(III)(terpy)F 3 ] complex is diamagnetic and can therefore be probed by NMR spectroscopy. terpy ( A ) Draw the structure of the complex. ( B ) Describe the 19 F-NMR spectrum of the complex. How many different signals do you expect? How are these split by the other fluorine ligands? What is the relative intensity of the peaks? (Note: for simplicity you should neglect couplings to other magnetic nuclei, e.g. 191 Ir, 193 Ir, 14 N).
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Chemical Control of Microbial Growth Assignment InstrucTons: You may either write or type in your responses to the following quesTons. Please do not answer on a separate sheet of paper. Much of this informaTon can be found in your textbook. Please do not limit yourself to consulTng ONLY your textbook, please use the internet to clarify any doubts that you have. If you are not sure, LOOK I± UP!!! ±his assignment is worth a total of 15 points. 1. Joseph Lister used what chemical agent to decrease the incidence of surgical wound infecTons (.25 pt)? Is this chemical sTll used today for this purpose? _______ Why or why not (.5 pt)? 2. What kinds of chemical agents are cresols (.25 pt)? What is an example of a commonly used cresol and its primary usage (.5 pt)? What is its mechanism of acTon (.25 pt)? 3. What are bisphenols (.25 pt)? Describe the usages of two common bisphenols (.5 pt). 4. Iodine and chlorine belong to the chemical agent category called _____________ (.25 pt) 5. Iodine is most commonly used as an iodophor. Explain what an iodophor is and what the advantage is for using this form of iodine (.5 pt). 6. ±he most eFecTve form of chlorine is__________________________________ (.25 pt) 7. If you wanted to disinfect living Tssue surfaces which of these two chemicals (iodine or chlorine) would you choose? Why (.5 pt)? If you wanted to disinfect kitchen utensils or water which would you choose, iodine or chlorine? Why (.5 pt)?
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8. Is it always necessary to kill or inhibit microbes in order to control their growth? Explain your answer (.5 pt). Explain the mechanism of control exhibited by soaps and detergents (.5 pt). 9. Describe the mechanism of acTon of alcohols such as ethanol and isopropanol (.25 pt). When alcohol cloths are used to swab the skin before injecTons, what is the major anTmicrobial eFect (.25 pt)? 10. List two commonly used aldehydes (.25 pt). Which of the two is more commonly used and why (.5 pt)? Can either be considered chemical sterilants (.25 pt)? 11. What chemicals are safe to use as food or beverage preservaTves? How do they work (.5 pt)? 12. Hand saniTzer has become a very popular anTsepTc. Let’s examine its relaTve uTlity. a. What is the acTve ingredient in this anTsepTc (.25 pt)? b. What are two of the most common causes of the common cold (.25 pt)? c. What is the eFect of alcohol on each (.5 pt)? d. What is the cause of the ±u (.25 pt)? e. Would hand saniTzer be eFecTve at controlling this microbe? Why or why not (.5 pt)?
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#1 1 decigram = _____ micrograms #2 The density of gold is 19.3 g/cm 3 . What volume (cm 3 ) would be occupied by a piece of gold with a mass of 103.5 g? #3 The number 0.00250 has __________ significant figures. #4 Explain the Rutherford nuclear-atom model, _______. #5 An atom of the most common isotope of lead, 204 Pb, has _____ protons, _____ neutrons, and _____ electrons. #6 List all diatomic molecules? #7 The correct name for S 2 F 5 is _______. #8 Balance the following equations: C 2 H 4 O + O 2 → CO 2 + H 2 O H 2 SO 4 (aq) + KOH(aq) → H 2 O(l) + K 2 SO 4 (s) Al(OH) 3 (s) + H + (aq) → H 2 O(l) + Al 3+ (aq)
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Form A BIS 104 Midterm Exam I – 4/23/2013 1 Instructions: READ CAREFULLY DO NOT OPEN UNTIL INSTRUCTED . Use #2 pencil and mark the version of your test on the Scantron. This is FORM A . Use #2 pencil and fill out carefully your NAME and ID number on the scantron The exam will end promptly at 10.20 AM . For each question choose ONE best answer by filling the corresponding bubble in the scantran clearly and completely. If you decide to change an answer, make sure you completely erase the previous answer. If you think there are two correct answers, only pick the best one. For each question there is ONE best answer. If you think there is an error in the exam, notify the instructor after the exam . Since this is a large room, the instructor cannot help you define terms or clarify wording or any other issues related with the exam. There are 25 questions. 16 of them are worth 5 points, 2 are worth 3 points, and 7 are worth 2 points each for a total of 100 possible points. https://www.coursehero.com/file/10188595/ExamIFormA/ This study resource was shared via CourseHero.com
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Form A BIS 104 Midterm Exam I – 4/23/2013 2 1. The diagrams show the paths of light rays passing through a specimen (white circle) with a dry lens and with an oil-immersion lens. Why resolution achieved from a dry lens is not as good as an oil immersion lens? (5 points) A. Numerical aperture of dry lens is more compared to an oil immersion lens B. Longer wavelength of light is used to illuminate the object using a dry lens C. Shorter wavelength of light is used to illuminate the object using an oil immersion lens D. Numerical aperture of dry lens is less than an oil immersion lens E. Longer wavelength of light is used to illuminate the object using an oil immersion lens 2. Membrane fluidity is affected by the presence of many transmembrane proteins in the membrane. A.TRUE; B.FALSE (2 points) 3-5. You treat some mammalian cells with trypsin proteolytic enzyme that is too large to penetrate the membrane (Set 1). Another group of cells are made permeable before treatment with the trypsin enzyme so that it can get inside the cell (Set 2). A third set of cells was not treated with the trypsin at all (controls). Proteins are then extracted from the three different sets of cells and separated by an SDS-PAGE gel followed by immunoblotting. Protein Y is only present in the gel of the extracts from control cells; but not present in the extracts from the Set 1 and Set 2 cells. Protein Z migrates to a longer distance when extracted from Set 1 cells than does protein Z in the controls; Protein Z is not present in the gel of the extracts from Set 2. Protein X migrates the same distance on gels of proteins from the controls and the proteins extracted from Set 1, but it is not present in the extracts from Set 2 cells. 3. Which protein is exposed only on the cytoplasmic surface of the membrane? (5 points) A. Protein X B. Protein Y C. Protein X & Y D. Protein Z E. Protein X & Z 4. Which protein is a transmembrane protein? (5 points) A. Protein X B. Protein Z C. Protein Y D. A & B E. B & C 5. What type of protein is Y? (5 points) A. A transmembrane protein B. An intracellular peripheral membrane protein C. An extracellular peripheral membrane protein D. A membrane associated protein attached to inner leaflet of the lipid bilayer E. None of the above https://www.coursehero.com/file/10188595/ExamIFormA/ This study resource was shared via CourseHero.com
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