Chapter-12-Handouts

Chapter-12-Handouts - 1 Chapter 12: Quantum Mechanics and...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Chapter 12: Quantum Mechanics and Atomic Theory o Electromagnetic Radiation o Quantum Theory o Particle in a Box o The Hydrogen Atom o Quantum Numbers o Orbitals o Many Electron Atoms o Periodic Trends 1 Big Idea: The structure of atoms must be explained using quantum mechanics, a theory in which the properties of particles and waves merge together. Chapter 12: Quantum Mechanics and Atomic Theory Electromagnetic Radiation Electromagnetic Radiation: Consists of oscillating (time-varying)electric and magnetic fields that travel through space at 2.998 10 8 ? ? (c = speed of light) or just over 660 million mph. 2 Note: All forms of radiation transfer energy from one region of space into another. Examples of Electromagnetic Radiation: Visible light Radio Waves X-Rays Chapter 12: Quantum Mechanics and Atomic Theory Electromagnetic Radiation Wavelength (): Is the peak-to-peak distance. Amplitude: Determines brightness of the radiation. Frequency (): The number of cycles per second ( 1 ? = 1 ? ). 3 Note: Changing the wavelength changes the region of the spectrum (i.e. x-ray to visible). Chapter 12: Quantum Mechanics and Atomic Theory Electromagnetic Radiation 4 Chapter 12: Quantum Mechanics and Atomic Theory Quantum Theory If white light is passed through a prism, a continuous spectrum of light is found. However, when the light emitted by excited hydrogen atoms is passed through a prism the radiation is found to consist of a number of components or spectra lines. 5 Chapter 12: Quantum Mechanics and Atomic Theory Quantum Theory Black Body: An object that absorbs and emits all frequencies of radiation without favor. Heated Black Bodies = . ? ? = . ? 6 Note: max is the most prevalent wavelength not the longest wavelength. 2 Chapter 12: Quantum Mechanics and Atomic Theory Quantum Theory Theory Scientists used classical physics arguments to derive an expression for the energy density (Rayleigh Jens Law). ???? ?? 4 The Problem With Explaining Black Body Radiation Using Classical Mechanics Classical mechanics put no limits on minimum wavelength therefore at very small , ? would be a huge value even for low temperatures. 7 Chapter 12: Quantum Mechanics and Atomic Theory Quantum Theory Max Plank: Proposed that the exchange of energy between matter and radiation occurs in quanta, or packets of energy. His central idea was that a charged particle oscillating at a frequency , can exchange energy with its surroundings by generating or absorbing electromagnetic radiation only in discrete packets of energy....
View Full Document

This note was uploaded on 01/18/2012 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

Page1 / 10

Chapter-12-Handouts - 1 Chapter 12: Quantum Mechanics and...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online