2009 midterm - Chemistry 2223b Midterm Test March 2009 Page 1 EXAM CODE 111 1 3D movie glasses have one red lens and one blue lens Which colour of

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Chemistry 2223b Midterm Test, March 2009 Page 1 EXAM CODE 111 1. 3D movie glasses have one red lens and one blue lens. Which colour of light would NOT be observed by the eye covered with the red lens? A) Green B) Yellow C) Red D) Orange E) Violet 2. Rank the compounds below in the order of increasing HOMO-to-LUMO gap, from smallest to largest. CH 3 NO 2 12 3 4 Smallest Largest A) 3 4 2 1 B) 1 2 4 3 C) 1 2 3 4 D) 4 1 2 3 E) 4 3 2 1
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Chemistry 2223b Midterm Test, March 2009 Page 2 3. Which one of the following statements regarding UV-visible absorption spectroscopy is incorrect? A) None of the other statements are incorrect ( i.e. all are correct) B) The spectrum is a plot of absorbance as a function of wavelength C) The emission is monitored perpendicular to the excitation beam D) The incident beam passes through the sample E) Electrons are excited when the sample absorbs UV-visible light 4. Which one of the following statements best explains why the absorption of UV-visible light by molecules is observed as bands instead of lines? A) Vibrational excitation also occurs B) Internal conversion also occurs C) Fluorescence also occurs D) The temperature of the sample also rises E) Bond-breaking also occurs 5. Both chlorophyll and heme are coordination compounds . As well, in many phosphate-transfer reactions, the phosphate oxygens are coordinated to magnesium. With respect to these examples, which one of the following statements is least likely to be correct? A) Heme carries oxygen via coordination B) Magnesium can have up to four coordinate bonds C) In phosphate-transfer reactions, coordination makes the phosphorous atom a better electrophile D) The atoms of the ligands are positively charged E) Iron can have up to six coordinate bonds
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Chemistry 2223b Midterm Test, March 2009 Page 3 6. Which one of the following absorbs the longest wavelength of light? A) O O SO 3 H HO 3 S H 2 N NH 2 B) O O C) O O CH 3 H 3 C 3 3 D) O O 3 H 3 S H 2 N 2 E) OH 3 H 3 S H 2 N 2 7. The outer membrane of Gram-negative bacteria is composed of which of the following components? A) Carbohydrate only B) Protein and carbohydrate C) Protein and lipid D) Lipid and carbohydrate E) Lipid and nucleic acid
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Chemistry 2223b Midterm Test, March 2009 Page 4 8. The antibiotic rifampicin is often used to treat MRSA (methicillin-resistant Staphylococcus aureus ) bacterial infections. The antibiotic works by inhibiting bacterial DNA synthesis. In order for rifampicin to reach the location of DNA synthesis, which cellular part(s) listed below must it cross or enter? 1. Cell wall 2. Mitochondria 3. Nucleus A) 1 only B) 3 only C) 1 and 2 only D) All of 1, 2, and 3 E) 1 and 3 only 9. An aqueous solution of histidine is at pH 8.0. If the side chain of histidine has a pKa of 6.0, approximately what percentage of the histidine in the solution has a positively charged side chain?
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This note was uploaded on 04/30/2011 for the course CHEMISTRY Chemistry taught by Professor Dr.felixlee during the Winter '11 term at UWO.

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2009 midterm - Chemistry 2223b Midterm Test March 2009 Page 1 EXAM CODE 111 1 3D movie glasses have one red lens and one blue lens Which colour of

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