Chapter 7 - Chapter 7: Quantum Theory & Atomic...

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Chapter 7: Quantum Theory & Atomic Structure Lecture Outline ± Overview ² The reason we study quantum theory and atomic structure is so that we can understand how atoms and molecules are put together (bonding) and how matter interacts with light (spectroscopy). ± Light ² Wave and Particle Nature ± Atomic Spectra ² Absorption and Emission Spectra ohr Model of the Hydrogen Atom ² Bohr Model of the Hydrogen Atom ± Quantum Mechanical Model of the Hydrogen Atom ² Schrödinger Equation ² Quantum numbers and Atomic Orbitals ± Reading: 7.1, 7.2, 7.4 ± Homework Problems: 7(8), 9(10), 13(15), 23(24), 27(28), 29(30), Slide No. 1 CHEM 1035 Fall 2007 Silberberg Chapter 7 ( )() () () () () 49(50), 55(56), 57(58), 59(60) ± ChemSkill Builder : 9.2 Review of the Atom ucleus ± Nucleus ² contains positively charged _____________ ² contains _________ that affect weight and stability ² tiny size but contains nearly all of the atomic ______ lectrons ± Electrons ² Orbit the nucleus in a diffuse "cloud" of particles ² The location and movement of electrons largely determines the of atoms within molecules ______________ of atoms within molecules. ± Early atomic theory ² Focused primarily on interactions of atoms with ________ ² The physics of ______ developed significantly around the same time Slide No. 2 CHEM 1035 Fall 2007 Silberberg Chapter 7 The Wave Nature of Light ± Light λ g ² Broader definition includes all electromagnetic radiation from radio- through gamma- rays. gg y ± Wave Characteristics ² speed, c = 3.0 x 10 8 m/s ² λ is the ____________ • crest-to-crest distance • mm, cm, m ² ν is the ____________ • "per second", s -1 , hz requency and Wavelength ± Frequency and Wavelength ² c = λν ² c = 3 x 10 8 m/s in a ________ emorize Slide No. 3 CHEM 1035 Fall 2007 Silberberg Chapter 7 (slightly slower in other media) ² As λ increases, ν decreases Memorize 7.1 Light Amplitude mplitude determines light not light ± Amplitude determines light __________ , not light _______ ± Amplitude determines sound _______ , not sound _______ ² Lower amplitude ² Higher amplitude Slide No. 4 CHEM 1035 Fall 2007 Silberberg Chapter 7
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The Electromagnetic Spectrum ight spectrum ± Light spectrum 400 nm 700 nm Low Energy High Energy Slide No. 5 CHEM 1035 Fall 2007 Silberberg Chapter 7 Low Frequency High Frequency The Particle Nature of Light ± Unsolved problems that led to the Quantum Theory pQ y ² Blackbody radiation ² The photoelectric effect ine spectra of gases ² Line spectra of gases ± 1900 – Planck – light is also particle-like. ² Photon = “particle” of electromagnetic energy ² When an atom absorbs energy, it absorbs one photon ² Photon energy is given by E = h ν = hc/ λ = Planck’s Constant = 6 626x10 –34 •s)/(photon) emorize ² h = Planck s Constant = 6.626x10 (J•s)/(photon) – the “per photon” is usually omitted from the units Memorize E = h ν = hc/ λ ± Light Concepts – True or False a) As the wavelength of light increases, its energy decreases.
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This note was uploaded on 04/22/2008 for the course CHEM 1035 taught by Professor Jgdillard during the Fall '07 term at Virginia Tech.

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Chapter 7 - Chapter 7: Quantum Theory & Atomic...

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