6 Pre-Lab Answer Key

6 Pre-Lab Answer Key - CHEMISTRY 6BL EXPERIMENT#6 ATOMIC SPECTRA Fall Quarter 2007 PRE-LAB QUESTIONS(20 points(from Lab Manual page 76 1(3 points

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CHEMISTRY 6BL: EXPERIMENT #6: ATOMIC SPECTRA Fall Quarter, 2007 PRE-LAB QUESTIONS (20 points) : (from Lab Manual, page 76) 1. (3 points) Finish the Table (take to 3 sig. fig's): Color: Red Green Wavelength ( λ ) 700. nm 520. nm Energy (E) 2.84 × 10 -19 J 3.82 × 10 -19 J Frequency ( ν ) 4.28 × 10 14 Hz 5.76 × 10 14 Hz The color of light with the higher: Energy (E) is (circle one): RED GREEN Frequency ( ν ) is (circle one): RED GREEN 2. (1 point) The color of light at 518 nm that boron emits is ___ GREEN __. 3. (4 points) So, E = 350. kJ/mol. Then, λ = ____ 342 nm ____. Workings: From: λ = [h × c]/[E ÷ N A ] = [(6.626 × 10 -34 J·s)(2.998 × 10 8 m/s)]/[(350 x 10 3 J/mol)/(6.022 × 10 23 molec/mol)] = 342 × 10 -9 m = 342 nm (UV) Could UV lamps be used to break these bonds? YES NO (circle one) WHY? ___ 342 nm is in the UV (ultraviolet), so any UV lamp emitting ______ __ ___ at <342 nm wavelength (including lamps at 248 nm) could break ___ ___ these C-C single bonds. ______________________________________
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4. (3 points)
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This note was uploaded on 10/16/2010 for the course CHEM 6B taught by Professor Crowell during the Spring '08 term at UCSD.

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6 Pre-Lab Answer Key - CHEMISTRY 6BL EXPERIMENT#6 ATOMIC SPECTRA Fall Quarter 2007 PRE-LAB QUESTIONS(20 points(from Lab Manual page 76 1(3 points

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