Chapter 7.ppt - The highest recorded temperature was 136F...

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The highest recorded temperature was 136°F in Libya. The lowest was -128°F in Antarctica.
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AP Chemistry Abigail Giordano 2 Chapter 7 Atomic Structure and Periodicity
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AP Chemistry Abigail Giordano 3 Electromagnetic Radiation Radiant energy that exhibits wavelength-like behavior and travels through space at the speed of light in a vacuum.
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AP Chemistry Abigail Giordano 4 Waves Waves have 3 primary characteristics: 1. Wavelength : distance between two peaks in a wave. 2. Frequency : number of waves per second that pass a given point in space. 3. Speed : speed of light is 2.998 10 8 m/s.
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AP Chemistry Abigail Giordano 5 Wavelength and Frequency Wavelength and frequency can be interconverted. = c / = frequency (s 1 ) = wavelength (m) c = speed of light (m/s)
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AP Chemistry Abigail Giordano 6 Planck’s Constant E = change in energy, in J h = Planck’s constant, 6.626 10 34 J s = frequency, in s 1 = wavelength, in m Max Planck found that energy can only be gained or lost Max Planck found that energy can only be gained or lost in whole-number multiples of in whole-number multiples of hv hv Energy can only occur in discrete units called Energy can only occur in discrete units called quanta quanta . .
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AP Chemistry Abigail Giordano 7 Energy and Mass Energy has mass E = m c 2 E = energy m = mass c = speed of light Electromagnetic radiation is quantized in particles called photons
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AP Chemistry Abigail Giordano 8 Wave-Particle Duality Theory What about the other way, is matter a wave? Yes Is energy a wave like light, or a particle? BOTH
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AP Chemistry Abigail Giordano 9 Wave-Particle Practice 1. The laser light of a CD player has a wavelength of 7.80 x 10 2 m. What is the frequency of this light? 2. What is the energy of a photon of this light? 3. What is the energy of a mole of these photons?
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AP Chemistry Abigail Giordano 10 Atomic Spectrum of Hydrogen Continuous spectrum : Contains all the wavelengths of light. Line spectrum : Contains only some of the wavelengths of light. proved that only certain energies are allowed for the electron in the hydrogen atom
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AP Chemistry Abigail Giordano 11 Continuous vs. Line Spectra
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AP Chemistry Abigail Giordano 12 The Bohr Quantum Model The electron in a hydrogen atom The electron in a hydrogen atom moves around the nucleus only moves around the nucleus only in certain allowed circular orbits. in certain allowed circular orbits. Ground State : The lowest possible energy state for an atom ( n = 1).
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