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DiazJ_Exp10 - 6.45 7.15 Violet Blue Green Yellow Orange Red...

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Experiment 10: Atomic Spectra 11-9-11 Joel Diaz 11-17-11 Amber Tra, Lauren Kaiser, Kathryn Davis Chemistry 1045L-25 Ryan Riskowski
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Purpose The purpose of this experiment is to demonstrate the concept of emission spectra. This concept is demonstrated by using a spectroscope to determine the spectra of unknown lights. After, the spectra are used to determine the identity of the light. Procedure A spectrometer is obtained and set up in front of an unknown light source. The colors and wavelengths were observed and recorded. All the observations were then shared with the class. The unknown wavelengths were compared to the known wavelengths of helium and their identities were found. Data Table 1. Helium Calibration Data Known He Wavelengths Experimental Wavelengths 388.9 nm 4.0 447.1 nm 4.6 471.3 nm 4.9 492.2 nm 5.1 501.5 nm 5.2 587.6 nm 6.0 667.8 nm 7.0 706.5 nm 7.5 Table 2. Unknown Data Unknown Light Source Observed Values Corresponding Colors Corrected Wavelengths Identity of Unknowns 1 6.05 Yellow 579.9 nm Sodium 2 4.50 5.15 5.77 6.20
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Unformatted text preview: 6.45 7.15 Violet Blue Green Yellow Orange Red 437.6 nm 497.3 nm 554.2 nm 593.7 nm 616.6 nm 680.9 nm 3 5.45 5.95 7.55 Blue Green Red 524.8 nm 570.7 nm 717.6 nm 4 4.40 4.50 5.50 5.80 6.10 6.40 Violet Blue Green Yellow Orange Red 428.4 nm 437.6 nm 529.4 nm 557.0 nm 584.5 nm 612.1 nm 5 4.00 4.40 5.55 5.90 Violet Blue Green Orange 391.7 nm 428.4 nm 534.0 nm 566.1 nm Calculations Conclusion In an emission spectrum, light is emitted from element when it releases energy. In an absorption spectrum, some light is absorbed by the element, but others are reflected back. The wavelength of an element is generated by the emission of energy, which is the transition between stationary states. The distance between these stationary states creates the differences. NASA uses spectroscopy to determine if a planet is moving away or towards us. We say the sun is a yellow star because the sun radiates as a yellow spectrum due to the fusion of hydrogen to helium....
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