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Class notes CHEM 121: Chapter 4

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Course
CHEM 121 (CHEM121)

Institution
University Of British Columbia (UBC )

Chapter 4 discusses about Quantum theory…Quantum numbers such as principles numbers, spin numbers, angular momentum numbers and etc…

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Uploaded on December 27, 2022
Number of pages 9
Written in 2022/2023
Type Class notes
Professor(s) Laura stirchak
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Chapter 4 : quantum mechanics

10/7/2022

CHEM 121 111

, Fundamentals of Quantum Mechanics

Wave nature of matter
Interference: when two waves collide (one raises in amplitude
while one is decreasing in amplitude)

✗ =h p=mv Kinetic energy = 1/2 mv
&

p
-34

h= Planks consant (6.626 x 10 ) Kg m/s
p= mass x velocity Kg m/s (Momentum)
m= mass in kilograms
v= 3.30 x 10 m/s (Velocity)
6

✗ = wavelength

Electrons both behave as particle and waves

When mass increase wavelength decreases:

Only small objects like (an electron) are defined by
quantum mechanics. Small objects like electrons can
oscillate. Big objects will not oscillate because their mass
exceeds that of the de broglie wavelength

•Mr
This is why we don’t see something
Barnum big (like a tennis ball) oscillate

⑧ 0 0. # @ = Crystal particles
O O O Wave of large wavelength will hit many crystal particles

D
•
Tr Smaller wavelengths will diffract

Smallest wavelength will pass though the
particles

Tip:
When any question mentions atomic crystals, USE De Broglie
wavelength

10

Conversion for angstrom A : 1.00x 10
-

"
conversion for Joules electron ) Joules )
,o↓
[ joules per
=
6- Od ✗ 10 cavogadro 'S constant
✗ ✗
e- e- ,

1

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