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Bohr model

AP Chemistry Zumdahl 7E Chapter 7 Notes

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Bohr model

AP Chemistry A. Allan Chapter 7 Notes - Atomic Structure and Periodicity 7.1 Electromagnetic Radiation A. Types of EM Radiation (wavelengths in meters) 10-12 10-10 10-8 4 to 7x10-7 10-4 10-2 1 102 104 Wavelength increases Frequency decreases Energy decreases Speed is constant = 2.9979 x 108 m/sec B. Properties of EM Waves 1. Wavelength (l) a. Distance between two consecutive peaks or troughs in a wave b. Measured in meters (SI system) 2. Frequency (n) a. Number of waves that pass a given point per second b. Measured in hertz (sec-1) 3. Speed ( c ) a. Measured in meters/sec 4. Relationship of properties a. c=nl gamma xrays UV visible IR micro Radio waves FM short AM 7.2 The Nature of Matter

Principles of Chemistry Chapter 6

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Bohr model

Chapter 6: The Periodic Table & Atomic Structure Section 6.2: The Electromagnetic Spectrum Monday, September 15, 2014 3:06 PM Visible Light - portion of electromagnetic spectrum that we can see, typically with wavelengths between 400 / 700 nanometers ? Electromagnetic Spectrum - various forms of light, consisting of oscillating electric and magnetic fields ? ? ? The Wave Nature of Light ? Wavelength - distance between corresponding points on a wave Amplitude - height of the wave from equilibrium position Frequency - number of cycles of a wave passing a certain point per second (measured in Hz) **note: amplitude corresponds with brightness, wavelength and frequency correspond with color ? Speed of light ( c ) : c = lamda x v = wavelength x frequency ? The Particulate Nature of Light

Atomic Structure

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The Wave Nature of Light All forms of NRG/Light have characteristic wavelengths (?) and frequency (?). Inversely related ? ? = c (the speed of light) Light visible to the naked eye exists as a tiny portion of the electromagnetic spectrum Max Planck Transfer of energy was not continuous Only came in certain values (quantized) ?E = h? h = Planck?s constant = 6.626 x 10-34 Js Packets of energy (quantum Albert Einstein Proposed that electromagnetic radiation was quantized and made up of a stream of particles Photons The dual nature of light ? = h/mv (deBroglie equation) Electrons as Waves Louis de Broglie (1924) Applied wave-particle theory to electrons electrons exhibit wave properties QUANTIZED WAVELENGTHS

Bob Jones PPT Notes -- Chapter 4a

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The Development of Atomic Models: A Historical Perspective 1 Model of an Atom An IDEA of what it looks like (a working representation) 2 Atomic Models Democritus? Idea An object CANNOT be divided indefinitely. There is a smallest particle. atom: (Gk. atomos?indivisible) 3 Democritus ? Chemistry textbook p. 73 (BJU Press) Atomic Models There is a basic unit of matter?the atom. Chemists found this out by looking at the mass ratio of substances. But the atom is NOT indivisible. Democritus? Idea was CORRECT! 4 Democritus ? Chemistry textbook p. 73 (BJU Press) Continuous: Matter can be subdivided forever. Particulate: A smallest particle exists. 2 Theories Atomic Models 9 grams of H2O: 8 grams of oxygen 1 gram of hydrogen Ratio is 8:1 Mass Ratio 90 grams of H2O:

Chemistry The central science Summary Chapter 6

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Hot Objects and the Quantization of Energy Heated solids emit radiation (blackbody radiation) The wavelength distribution depends on the temperature (i.e., ?red hot? objects are cooler than ?white hot? objects). In 1900 Max Planck solved the problem He investigated black body radiation. He proposed that energy can only be absorbed or released from atoms in ?chucks? of some minimum size . These amounts are called quanta. A quantum (meaning ?fixed amount?) is the smallest amount of energy that can be emitted or absorbed as electromagnetic radiation. The relationship between energy and frequency is: . The Photoelectric Effect and Photons The photoelectric effect provides evidence for the particle nature of light and for quantization.

chemistry midterm review

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 MIDTERM REVIEW Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Inorganic chemistry is the study of a. non-carbon related compounds. b. the chemistry of living things. c. mathematical modeling. d. the identification of the composition of materials. ____ 2. A student recorded the following while completing an experiment. Color of substance: yellow, shiny powder Effect of magnet: yellow, shiny powder was attracted The student should classify the substance as a(n) a. element. c. mixture. b. compound. d. plasma. ____ 3. Which of the following is not a physical change? a. grinding c. boiling b. cutting d. burning
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