Ap Chemistry Michalek - Unit 7: Atomic Structure And Periodicity Worksheet Page 5
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29AP Chemistry--Michalek
5
Unit 7 Atomic Structure and Periodicity
7.2 Notes
Energy is in fact quantized and can occur only in discrete units of h .
-34
E = h
h = 6.6262 x 10
J*s
Example
The blue color in fireworks is often achieved by heating copper (I) chloride to about 1200 C. Then the compound emits a
blue light having a wavelength of 450 nm. What is the increment of energy that is emitted?
Example
What is the energy of the red light that has a wavelength of 675 nm?
de Broglie’s equation
λ = h
mv
Light can have wave like properties, and have certain characteristics of particulate matter.
Example
-31
7
Compare the wavelength for an electron (mass = 9.31 x 10
kg) traveling at a speed of 1.0 x 10
m/s with that for a ball
(mass = 0.10 kg) traveling at 35 m/s.
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