This preview shows pages 1–4. Sign up to view the full content.
1
Welcome to CHM 1220/1225
Please turn off
cell phones
pages
iPods
Thank you!
Chapter 7 Homework
Due: By 5:30 p.m.
Wednesday, September 12, 2007
Recommended
Exercises: all
Odd numbers Practice Problems 7.297.63
Required
Conceptual Problems: odd numbers 7.197.27
Practice Problems: odd numbers 7.657.83
Cumulative Skills Problems: 7.85, 7.89, 7.91
• Prelecture Assignment 02 will be available at
7:00 p.m. today and is due by 5:00 p.m.,
Wednesday, September 12, 2007
• Chapter 7 Quiz will be available at 2:00 p.m.
today and is due by noon, Wednesday,
September 12, 2007
• Chapter 7 Homework is due by 12:50 p.m.
Wednesday, September 12, 2007
• Chapter 14 Quizzes are available and are due
by noon, Monday, September 24, 2007
Chapter 7
Quantum Theory of the Atom
Light Waves, Photons, and the Bohr Theory
1.
The Wave Nature of Light
2.
Quantum Effects and Photons
3.
The Bohr Theory of the Hydrogen Atom
Quantum Mechanics and Quantum Numbers
4.
Quantum Mechanics
5.
Quantum Numbers and Atomic Orbitals
Because light behaves as a wave, we need to better
understand waves.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document 2
A
wave
is a continuously repeating change or
oscillation in matter or in a physical field. Light
is also a wave.
– It consists of oscillations in electric and
magnetic fields that travel through space.
– Visible light, X rays, and radio waves are
all forms of
electromagnetic radiation
.
A wave can be characterized by its
wavelength
and
frequency.
–The
wavelength,
λ
(lambda),
is the
distance between any two adjacent
identical points of a wave.
frequency,
ν
(nu)
, of a wave is the
number of wavelengths that pass a fixed
point in one second.
Figure 7.3
Water wave (ripple).
The product of the frequency,
ν
(waves/sec)
and the wavelength,
λ
(m/wave) will give the
speed of the wave in m/s.
– In a vacuum, the speed of light, c, (to three
significant figures) is 3.00 x 10
8
m/s
Therefore
– So, given the frequency of light, its
wavelength can be calculated, or vice
versa.
ν
λ
=
c
Figure 7.5
The electromagnetic spectrum.
What is the wavelength of yellow light with
a frequency of 5.09 x 10
14
s
1
? (Note: s
1
,
commonly referred to as Hertz (Hz) is
defined as “cycles or waves per second”.)
?
3
A Word on Significant Figures
Always use one more digit than is required for
intermediate calculations.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/27/2008 for the course CHEM 1220 taught by Professor Barber during the Fall '08 term at Wayne State University.
 Fall '08
 barber
 pH

Click to edit the document details