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Chemistry Chapter 5

Chemistry Chapter 5. Ch5 Notes #1. Light and Quantized Energy. An element’s chemical behavior is connected to electron arrangement Electron arrangement and chemical properties are connected to light energy Form of energy that exhibits wave- like behavior….

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Chemistry Chapter 5

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  1. ChemistryChapter 5 Ch5 Notes #1

  2. Light and Quantized Energy • An element’s chemical behavior is connected to electron arrangement • Electron arrangement and chemical properties are connected to light energy • Form of energy that exhibits wave- like behavior…. • Ex. Visible light, x-rays, microwaves, etc…. • EM Spectrum – all electromagnetic radiation

  3. Waves • Described by: • Wavelength: Shortest distance between 2 equivalent points on a continuous wave • Amplitude: height from origin to crest • Frequency: how many complete waves pass a point in a given amount of time • Hertz; waves per second • Speed of light (c)- wavelength x speed • 3.00 x 108 m/s

  4. Waves - review

  5. Light – Wave or particle? • Max Planck • Quantum – minimum amount of energy that can be gained or lost by an atom… • Albert Einstein (1905) • Completion of the particle model • EM radiation = stream of tiny particles (bundles of energy) that move like a wave – called photons • Photon = a particle of EM radiation with no mass that carries a quantum of energy

  6. Light – Wave or particle? • EM radiation – wave and particle like!! Increasing Energy

  7. Atomic Emission Spectra • Set of frequencies of the electromagnetic waves emitted by atoms of an element • Each element gives off a unique set of frequencies • Quantum Mechanics • Electrons emit certain energy (related to wavelength) • Each spectra consists of several “lines” of color…not a continuous range like a visible spectra (rainbow) – there are “black” spaces in between the colors.

  8. Example

  9. Real Life Uses • Fireworks • Neon Signs • Bon-Fire (Old Christmas lights) • Rainbows • Scientists can learn what stars are made of by observing the spectrum they emit • Photoelectric panels (solar houses, calculators)

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