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Chemistry Chapter 5 Ch5 Notes #1.

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1 Chemistry Chapter 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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