Announcements
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Pre-lab due this week at the start
of lab!
Electronic HW #6 Type 1 due
Monday, Nov. 18th at 7:00pm
Electronic HW #6 Type 2 due
Wednesday, Nov. 20th at 7:00pm
Exam II Score
Comparison of Exam Scores
Exam I Score
Clicker #1
Which is lower in potential energy and
more stable?
unburned match
or
A) unburned match
B) burned match
burned match
Exothermic: more energy Endothermic: more energy
leaves the system overall
goes into the system overall
2H2 + O2  2H2O
2H2O  2H2 + O2
Example #1
Is the freezing of water an endothermic
or exothermic process? (The system is
underlined.)
Exothermic
Clicker #2
Is the boiling of water an endothermic or
exothermic process? (The system is
underlined.)
A)
B)
endothermic
exothermic
Example #2
Is an activated cold pack an endothermic
or exothermic process? (The system is
underlined.)
Endothermic
Clicker #3
Is an activated hot pack an endothermic
or exothermic process? (The system is
underlined.)
A)
B)
endothermic
exothermic
Clicker #4
Is a racquetball frozen by liquid nitrogen
an endothermic or exothermic process?
(The system is underlined.)
A)
B)
endothermic
exothermic
Example #3
Is the thermite reaction (the chemical
reaction) an endothermic or exothermic
process? (The system is underlined.)
Exothermic
Fe2O3 (s) + 2 Al
(s)
 2 Fe(l) + Al2O3(s)
Overall goal:
Atomic Structure
Chemical Bonding
3D Molecular Structure
Molecular Properties
Reading homework for Thursday
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Review the various atomic models in
your textbook (Sections 4.3, 4.5)
Read about electromagnetic radiation
(Sections 11.1-11.3)
J.J. Thompson’s discovery:
http://www.chem.illinois.edu/clcwebsite/cathode.html
Rutherford’s experiment:
http://www.youtube.com/watch?v=5pZj0u_XMbc