Exam 1 Results
4 Perfect Scores!
Average = 67
27%
22%
12%
23%
14%
2%
Week 5
CHEM 1310 - Sections L and M
1
Exam 1 Score
Look up Score
– Via WebCT: One point already added to
ScanTron™ score!
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Papers returned in lab this Fri
Week 5
CHEM 1310 - Sections L and M
2
Content Recap
ATOMS
Bonding
Bonding
MOLECULES
IONS
States of Matter
Gases, Liquids, Solids
Week 5
CHEM 1310 - Sections L and M
3
1
Content Recap
ATOMS
Bonding
MOLECULES
Bonding
IONS
Quantum Mechanics
Week 5
How does bonding
occur on the
molecular level?
How do molecules
interact with each
other to form liquids
and solids?
CHEM 1310 - Sections L and M
4
Mon| Sep 17, 2007
 Chapter 12: Quantum Mechanics & Atomic
Theory
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12.1
12.2
12.3
12.4
12.5
12.6
Electromagnetic Radiation
The Nature of Matter
The Atomic Spectrum of Hydrogen
The Bohr Model
Quantum Mechanical Description of an Atom
SKIP THIS SECTION
What is quantum mechanics?
Why study electromagnetic radiation to understand it?
Week 5
CHEM 1310 - Sections L and M
5
What is Quantum Mechanics?
Classical Mechanics
F=mxa
Only applies to
“big” objects!
Scanning Tunneling Microscopy
1986 Nobel Prize in Physics
Quantum mechanics is a field of study that describes the
motion of “small” objects (i.e. subatomic particles).
Week 5
CHEM 1310 - Sections L and M
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2
What is Quantum Mechanics?
Bonding
– Occurs through movement in electrons
– Must understand how electrons move
Quantum Mechanics
– Small objects (such as light and electrons) move
according to rules of quantum physics
– “Quantum” = small packet of radiation that exhibits a
discrete amount of energy
How can we describe quanta, or radiation?
Week 5
CHEM 1310 - Sections L and M
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Electromagnetic Radiation
Forms of Energy
– Kinetic
– Potential
 Modes of Energy Transfer
– Light (or Radiation)
– Heat (Enthalpy - Chapter 9)
Week 5
CHEM 1310 - Sections L and M
8
2 Views of Light
Frequency vs. Wavelength
Amplitude
Time, s
Amplitude
λ, nm
Week 5
CHEM 1310 - Sections L and M
9
3
Electromagnetic Radiation
λν = c
Week 5
λ = “lambda”
ν = “nu” = frequency
CHEM 1310 - Sections L and M
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Frequency
λν = c
Units of Frequency
cycles/sec = hertz
Notice how λ
changes with ν
Week 5
CHEM 1310 - Sections L and M
11
Electromagnetic Spectrum
V-I-B-G-Y-O-R
Week 5
CHEM 1310 - Sections L and M
12
4
Dual Nature of Quantum Matter
Dual nature of light: wave and particulate nature of EM radiation
Ephoton = h ν =
Week 5
hc
λ
CHEM 1310 - Sections L and M
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5