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Week 5 CHEM 1310 - Sections L and M 1
Exam 1 Results
4 Perfect Scores! Average = 67
12% 14%
22% 23%
27%
2%
Week 5 CHEM 1310 - Sections L and M 2
Exam 1 Score
Look up Score– Via WebCT: One point already added to
ScanTron™ score!– Via Lecture Notes Link: Correct Score Listed
Papers returned in lab this Fri
Week 5 CHEM 1310 - Sections L and M 3
Content Recap
ATOMS
MOLECULES IONS
BondingBonding
States of Matter
Gases, Liquids, Solids
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Week 5 CHEM 1310 - Sections L and M 4
Content Recap
ATOMS
MOLECULES IONS
BondingBonding
How do moleculesinteract with each
other to form liquidsand solids?
Quantum Mechanics
How does bondingoccur on the
molecular level?
Week 5 CHEM 1310 - Sections L and M 5
Mon| Sep 17, 2007
Chapter 12: Quantum Mechanics & AtomicTheory– 12.1 Electromagnetic Radiation– 12.2 The Nature of Matter– 12.3 The Atomic Spectrum of Hydrogen– 12.4 The Bohr Model– 12.5 Quantum Mechanical Description of an Atom– 12.6 SKIP THIS SECTION
What is quantum mechanics?Why study electromagnetic radiation to understand it?
Week 5 CHEM 1310 - Sections L and M 6
What is Quantum Mechanics?
Scanning Tunneling Microscopy1986 Nobel Prize in Physics
Classical Mechanics
F = m x a
Only applies to“big” objects!
Quantum mechanics is a field of study that describes the motion of “small” objects (i.e. subatomic particles).
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Week 5 CHEM 1310 - Sections L and M 7
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 8
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 9
2 Views of Light
Frequency vs. Wavelength
Amplitude
Amplitude
Time, s
λ, nm
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Week 5 CHEM 1310 - Sections L and M 10
Electromagnetic Radiation
λ ν = c λ = “lambda”ν = “nu” = frequency
Week 5 CHEM 1310 - Sections L and M 11
Frequency
λ ν = c
Units of Frequencycycles/sec = hertz
Notice how λ changes with ν
Week 5 CHEM 1310 - Sections L and M 12
Electromagnetic Spectrum
V - I - B - G - Y - O - R