151F09Lab06 Emission D2L

151F09Lab06 Emission D2L - GenChem 6th Class Emission...

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GenChem Emission Spectroscopy Today’s Agenda: Review understanding of light emission. Review the Bohr model of the atom. Perform the challenge: measure the light emitted by various sources. Analyze results: determine the relative efficiencies. Discuss writing the report. 6 th Class
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GenChem The analysis of the light emitted by different substances is a powerful identification technique. It allows us to identify a substance or detect its presence in a sample and also to test our models of matter. How does matter emit light? Light is emitted when electrons move from high energy states to lower energy states in atoms and molecules.
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GenChem The Electrons in atoms can have only specific amounts of energy. The light that can be emitted is limited to the difference between these allowed energy levels. Why do atoms emit only certain wavelengths of light and not all wavelengths?
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GenChem Do all atoms emit the same wavelengths of light? Is light emission an extensive or intensive property? No. The light emitted is a PROPERTY of atoms Being an intensive property it can be used to identify atoms.
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GenChem There is another value to emission spectroscopy. Because light is emitted by atoms, it provides us with a window into the world of atoms. By studying the light emitted by atoms we can better understand their structure and behavior.
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Our current model of atomic structure is based on the work of Niels Bohr and is named in his honor. Bohr’s comments about Physics apply to Chemistry as well. "It is wrong to think that
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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151F09Lab06 Emission D2L - GenChem 6th Class Emission...

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