Lecture 7 part I Chem 102 IR

Lecture 7 part I Chem 102 IR - Chapter 7 part I Atomic...

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Chapter 7 part I Atomic structure
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What we know about an atom? Made up of protons, neutrons and electrons Proton Electron Nucleus Neutron Protons and neutrons sit in the nucleus Electrons are dispersed around the nucleus in “orbitals” We model these orbital as discreet energy levels/shells. The electrons then sit inside these shells.
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New theory of atomic structure What is the nature of matter? Matter is made up of atoms What is the nature of an atom? Description of the behavior of Matter and Energy at the atomic and subatomic level. Behavior of light and an atom
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Atomic Structure and Periodicity In the 19 th century it was believed that matter and energy are 2 separate and distinct entities Matter is made up of particles Particles have both mass and position (take up space) Energy as a form of light is made up of waves QUANTUM MECHANICS challenged this idea The position of a wave could not be specified
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What types of EM Radiation do we know? ELECTROMAGNETIC RADIATION Ultraviolet (UV) Electromagnetic Radiation Infrared (IR) Micro waves X rays One of the ways that energy travels through space. ALL exhibit the same type of wavelike behavior and travel at speed of light
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Characterization of Light Waves 1. Wavelength (λ): Length of 1 full wave. Distance between 2 consecutive troughs or peaks in a wave λ λ Time
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Characterization of Light Waves 2. Frequency (ν): Number of waves that pass a given point per second If the wavelength changes, so does the frequency Time ν = 2 cycles/sec 1 second ν = 3 cycles/sec
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Characterization of Light Waves 3. Amplitude (ν): Height of the wave as defined by a trough or a peak Time Intensity = (amplitude) 2
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c = λν 4. Speed of a wave (c): The speed of all light waves is 3 x 10 8 m/s (186,000 mi/hr) This is CONSTANT Characterization of Light Waves
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The nature of waves Wavelength (λ) Frequency (ν) Amplitude (A) 1 Hertz (Hz) = 1 cycle/sec 1/s or s -1 c = λν Λ is inversely proportional to V Speed of a wave (c):
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Wavelength and frequency can be interconverted The speed of light is constant Wavelength (nm) Frequency (Hz) Gamma rays Type of radiation X rays Ultra Violet Infrared Microwaves Radiowaves VISIBLE 10 -3 10 -1 10 10 3 10 5 10 7 10 9 10 11 10 13 10 30 10 18 10 16 10 14 10 12 10 10 10 8 10 6 10 4 c = λν
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Electromagnetic Spectrum Classification of all EM Radiation Wavelength defines the color of light.
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Lecture 7 part I Chem 102 IR - Chapter 7 part I Atomic...

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