Chem 161-2010 Lecture 14
1
CHEMISTRY 161-2010
LECTURE 14
ANNOUNCEMENTS
E-MAIL
ATTENDANCE
EXAMS

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Chem 161-2010 Lecture 14
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CHEM 161-2010 GRADES IN 2
nd
HOURLY EXAM
ALL SECTIONS
Douglass/Cook
Rutgers/Pharm
Avg of
Tavss’
sections
Avg of
D/C
sections
Avg of
Rutgers/Pharm
sections:
GRADES
SECTIONS
College Ave.

Chem 161-2010 Lecture 14
3
PLAN FOR TODAY
:
H&P Sections 7.8 – 7.9
WAVE MECHANICS: MATTER AS WAVES
• DE BROGLIE’S
EQUATION
• WAVE FUNCTIONS
QUANTUM NUMBERS AND ATOMIC ORBITALS
• QUANTUM NUMBERS
• ELECTRON PROBABILITIES AND THE
SHAPES
OF ORBITALS
• ELECTRON SPIN: A FOURTH QUANTUM NO.

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Chem 161-2010 Lecture 14
4
CHAPTER 7
LIGHT AND MATTER
ET: Describe light wave as electromagnetic radiation with a magnetic field, an electric field, and having a speed of 3 x 10
8
m/s.
Draw undulating light curve to
define
λ
,
υ
and amplitude.
Relate light to graph on next page.
ET: Discuss 3 equations from formula page and show that knowing one parameter gives the other two
Wavelength =
λ
= distance/cycle = distance
Frequency =
υ
= cycles/s = cycles s
-1
= s
-1
= Hz
Amplitude = intensity, brightness, related to no. of photons emitted
E
photon
= h
υ
ET: Use water waves to show relationship between high frequency and high energy; also use graph on next page.
υ
= c/
λ
E = hc/
λ
h = 6.626 x 10
-34
Js
= 6.626 x 10
-34
kgm
2
s
-2
s = 6.626 x 10
-34
kgm
2
s
-1
c = 3 x 10
8
m/s
DeBroglie theorem:
λ
= h/mv
ET: Wave-particle duality; tie into E = h
υ
m is the mass in kg
v = velocity in meters per second
Bohr atom:
Δ
E = -B((1/n
f
2
) - (1/n
i
2
))
B = 2.179 x 10
-18
J
Einstein’s photoelectric effect
Total Energy = Energy
threshold*
+ Energy
kinetic
Energy
total
=
h
υ
threshold
+
h
υ
kinetic energy