Chapter 6 - Chapter 6 Electronic Structure of Atoms General...

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Unformatted text preview: Chapter 6 Electronic Structure of Atoms General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Atoms can absorb (and then emit) light. Only certain frequencies of light can be absorbed by atoms. What is light? Electromagnetic Radiation = c - wavelength A - amplitude - frequency c speed of light (in vacuum) c = 2.998 10 8 m/s Electronic Structure of Atoms A A General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Eletromagnetic Radiation General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska = c - wavelength [m] - frequency [s 1 ] c speed of light [m/s] frequency: 1 Hz = (1 cycle)/s Electromagnetic Radiation: Frequency General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska = c - wavelength [m], - frequency [s 1 ], c speed of light [m/s] Electromagnetic Spectrum General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Electromagnetic Spectrum Electromagnetic Spectrum General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska / nm Visible Light Spectrum General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Light emitted by a substance. continuous spectrum (solid substances) when we heat an object: Spectrum of a Substance General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska red (hot) orange yellow white (hottest) Temperature of the object increases If we pass light from a continuous source (e.g., from a hot object) through a substance, then the continuous spectrum has some of the wavelengths removed! -- absorption spectrum Compare the absorption spectrum to the emission spectrum of H The Spectrum of Atomic Hydrogen General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska absorption spectrum of H emission spectrum of H Blackbody Radiation Read this Section in your Textbook General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Intensity of Radiation Emitted by Blackbody General Chemistry I, General Chemistry I, 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Quantization of Energy Energy can be emitted (or absorbed) by atoms only in discrete portions of some minimum size, called quantum (fixed amount) Plancks postulate....
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Chapter 6 - Chapter 6 Electronic Structure of Atoms General...

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