3b.Lec04E2W10 - 1 Experiment 2 Session 2 Solution Color...

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Unformatted text preview: 1 Experiment 2 Session 2 Solution Color Three hour lab Complete E2 (Parts 1 - 5) Prepare abstract and work on discussion presentation Complete preparation of E2 team report. Give team report to GSI at the end of lab or turn in by grace deadline to GSIs atrium level mailbox. 400 V iolet- B lue- G reen- Y ellow- O range- R ed 800 Background Information: Light and Energy The shorter the wavelength ( ), the greater is its energy The shorter the wavelength ( ), the higher is its frequency Light is a form of energy Electrons will move from a lower to an available higher energy level if the provided energy = exactly that needed for a possible energy level transition DEMO Background Information: Energy and electrons If electrons move from a higher to a lower energy level, the difference in energy will be released . Part 3. Solution Color and Light Interaction Understand if the presence or absence of solution color is related to or is NOT related to: Plot an absorption spectrum for each team assigned salt solution- the absorption and/or transmission of visible light?- the cations outer electron configuration?- the cations ionic radius?- placement of the cations element in the periodic table? Spectrophotometer Reminders Calibrate (0 absorbance and 100% transmission) the spectrophotomer with the blank every time you change the before reading sample absorbance Light Absorbance Reminders Abs = 0 100% light transmitted Abs = 1 10% light transmitted ABSORBANCE = -LOG TRANSMITTANCE Absorbance = 0 to 1.0 for minimal error 2 Absorbance vs. Transmission Spectrum The identity of a sample can be determined from its absorption or transmission spectrum Solution Color and Light Interaction DEMO Q. What is the visible color of a solution of NiSO 4 ? NiSO 4 is green and transmits primarily blue, yellow, and green s What colors does a solution of NiSO 4 transmit? Absorption max Transmission max 1A VIIIA 1 H 1s 1 IIA IIIA IVA VA VIA VIIA 2 He 1s 2 3 Li 2s 1 4 Be 2s 2 5 B 2s 2 2p 1 6 C 2s 2 2p 2 7 N 2s 2 2p 3 8 O 2s 2 2p 4 9 F 2s 2 2p 5 1 0 Ne 2s 2 2p 6 1 1 Na 3s 1 1 2 Mg 3s 2 IIIB IVB VB VIB VIIB VIIIB ! VIIIB IB IIB 1 3 Al 3s 2 3p 1 1 4 Si 3s 2 3p 2 1 5 P 3s 2 3p 3 1 6 S 3s 2 3p 4 1 7 Cl 3s 2 3p 5 1 8 Ar 3s 2 3p 6 1 9 K 4s 1 2 0 Ca 4s 2 2 1 Sc 3d 1 4s 2 2 2 Ti 3d 2 4s 2 2 3 V 3d 3 4s 2 2 4 Cr 3d 5 4s 1 2 5 Mn 3d 5 4s 2 2 6 Fe 3d 6 4s 2 2 7 Co 3d 7 4s 2 2 8 Ni 3d 8 4s 2 2 9 Cu 3d 1 0 4s 1 3 0 Zn 3d 1 0 4s 2 3 1 Ga 4s 2 4p 1 3 2 Ge 4s 2 4p 2 3 3 As 4s 2 4p 3 3 4 Se 4s 2 4p 4 3 5 Br 4s 2 4p 5 3 6 Kr 4s 2 4p 6 3 7 Rb 5s 1 3 8 Sr 5s 2 3 9 Y 4d 1 5s 2 4 0 Zr 4d 2 5s 2 4 1 Nb 4d 3 5s 2 4 2 Mo 4d 5 5s 1 4 3 Tc 4d 5 5s 2 4 4 Ru 4d 7 5s 1 4 5 Rh 4d 8 5s 1 4 6 Pd 4d 10 4 7 Ag 4d 1 0 5s 1 4 8 Cd 4d 1 0 5s 2 4 9 In 5s 2 5p 1 5 0 Sn 5s 2 5p 2 5 1 Sb 5s 2 5p 3 5 2 Te 5s 2 5p 4 5 3 I 5s 2 5p 5 5 4 Xe 5s 2 5p 6 5 5 Cs 6s 1 5 6 Ba 6s 2 5 7 La* 5d 1 6s 2 7 2 Hf 5d 2 6s 2 7 3 Ta 5d 3 6s 2 7 4 W 5d 4...
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This note was uploaded on 04/07/2010 for the course PSYCH 123 taught by Professor 123 during the Spring '10 term at University of Michigan.

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3b.Lec04E2W10 - 1 Experiment 2 Session 2 Solution Color...

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