2011 midterm - Chemistry 2223b Midterm Test, March 2011...

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Chemistry 2223b Midterm Test, March 2011 Page 1 Before starting the test, please ensure that you have: Correctly bubbled in your student number Entered section code 000 and exam code 111 1. 3-D movie glasses have one red lens and one blue lens. Which colour of light would the eye shielded by the red lens be least likely to observe? A) Yellow B) Blue C) Red D) Green E) Violet 2. Which one of the following statements about UV-visible absorption spectroscopy is least likely to be correct? A) The absorption of light is measured by comparing the intensities of the transmitted and reference beams. B) The amount of light absorbed at a given wavelength is directly proportional to the concentration of the sample. C) The monochromator selects the wavelength for which the absorption is measured. D) The reference and transmitted beams are of the same wavelength. E) The intensity of the transmitted beam is higher than that of the incident beam. 3. Which statement best explains why absorption of UV-visible light by molecules is observed as bands rather than lines? A) The absorption of UV-visible light results in ionization. B) Internal conversion occurs during light absorption. C) Molecules move slower than atoms and require more energy to excite. D) Bonds are broken when molecules absorb light. E) Vibrational excitation occurs as well.
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Chemistry 2223b Midterm Test, March 2011 Page 2 4. Rank the compounds below in the order of increasing wavelength of maximum absorption ( λ max ), from shortest to longest. CHO 12 3 Shortest Longest A) 1 2 3 B) 1 3 2 C) 3 2 1 D) 2 3 1 E) 3 1 2 5. Which one of the following processes does not happen after a chromophore absorbs UV-visible light? A) Vibrational cooling B) Intersystem crossing C) Effervescence D) Internal conversion E) Phosphorescence 6. Which non-radiative decay process occurs from the ( T 1 , υ 0 ) state? A) Internal conversion B) Fluorescence C) Phosphorescence D) Vibrational cooling E) Absorption
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Chemistry 2223b Midterm Test, March 2011 Page 3 7. Shown below is a dye extracted from cochineal, an insect. The dye contains a functional group known as a C-glycoside , and the anomeric carbon of the sugar is indicated by the arrow. Which of the statements is/are correct about the dye? O O COOH OH HO O 1. The dye contains a benzoquinone chromophore. 2. The sugar present in the dye is D-glucose. 3. At pH 7, the dye would be a zwitterion. A) 2 only B) 1 and 2 only C) 2 and 3 only D) 1 only E) All statements are correct 8. Which of the following are common properties are shared by all cells? 1. Genetic information in the form of DNA 2. Lipid-based plasma membrane 3. Membrane-bound compartments (organelles) A) 1 and 2 only B) 1 and 3 only C) 1 only D) 2 and 3 only E) All of them
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Chemistry 2223b Midterm Test, March 2011 Page 4 9. Which one of the following statements is least likely to be correct?
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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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2011 midterm - Chemistry 2223b Midterm Test, March 2011...

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