C_Unit_6_Electrons_2010-2011_K (1)

C_Unit_6_Electrons_2010-2011_K (1) - Unit 6: Electrons Unit...

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Unit 6: Electrons Unit 6: Electrons Chapter 5 Chemistry 1K Cypress Creek High School
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Electromagnetic Spectrum Electromagnetic radiation – a form of energy that exhibits wavelike behavior as it travels through space
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Visible Light R ed O range Y ellow G reen B lue I ndigo V iolet high energy low energy White light is the combination of all the visible colors of light
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Wave Nature of Light Light behaves like a wave Wavelength (λ ) - distance between equivalent points on wave; (m) Frequency (f) – number of waves per second; (Hz, also 1/s or s-1) All electromagnetic waves, including visible light, travel at the same speed of 3.00 x 10 8 m/s c = λν Where c = speed of light λ = wavelength
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Particle Nature of Light Light also behaves as a particle In 1900, the German physicist Max Planck (1858–1947) began searching for an explanation. That is, while light has wavelike characteristics, it also can be a stream of tiny particles, or bundles of energy, called photons
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Wave vs. Particle Video Wave vs. Particle Video
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Light (electromagnetic radiation) is a form of energy - it acts like a wave and a particle Caused by exciting electrons “jumping” energy levels and then returning to original energy level We see different colors of light (wavelengths) depending on how many energy levels electrons move and the amount of energy they possess
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As energy is absorbed, the electrons move from their ground state (original energy level) to an excited state (higher energy level) Is this change endothermic or exothermic? Endothermic )       )      )      )      )      )      )  1      2      3     4     5     6      7      energy levels ground state excited state Initial position Final position nucleus
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Electrons are unstable in their excited state, so they return to the ground state by releasing energy. During this return, light is emitted ! Is this change endothermic or exothermic? Exothermic )       )      )      )      )      )      )  1      2      3     4     5     6      7      nucleus energy levels Initial position Final position excited state ground state Electrons & Light
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Trapping Energy from Sunlight Trapping Energy from Sunlight The process that uses the sun’s energy to make simple sugars is called photosynthesis . Photosynthesis converts light energy into chemical energy: 6CO 2 + 6H 2 O→C 6 H 12 O 6 + 6O 2 As sunlight strikes the plant, the energy in the light is absorbed by the electrons exciting them .
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Spectra of Light Emission Spectra - Shows all the wavelengths of light that are emitted Spectroscope – instrument used to see the emission spectra
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Emission of Light In 1900, Max Planck described the emission spectrum of objects that were heated He discovered that matter can only
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C_Unit_6_Electrons_2010-2011_K (1) - Unit 6: Electrons Unit...

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