To Do…
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http://chem.illinois.edu
Slides on the website (after each
lecture)
Lab tomorrow – review for the exam
(due Friday, February 14 by 7 pm)
Lon-Capa (HW3 Type 2 due
Wednesday, February 12 by 7 pm).
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Exam 1
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Tuesday, February 18; 7:00 pm – 8:30
pm; 114 David Kinley Hall (DKH)
Conflict: 2/18; 5:00 pm – 6:30 pm;
140 Burrill
All free response.
See me right away if you have a
conflict with the exam and conflict
times.
2
V vs. T(°C) (constant P, n)
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V vs. T(K) (constant P, n)
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Clicker Question
Determine the size of a balloon filled
with 4.00 moles of helium gas. Room
conditions are 1.00 atm and 22C.
a) 1.81 L
b) 7.22 L
c) 24.2 L
d) 96.8 L
5
Clicker Question
Determine the size of a balloon filled
with 4.00 moles of helium gas. Room
conditions are 1.00 atm and 22C.
a) 1.81 L
b) 7.22 L
c) 24.2 L
d) 96.8 L
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Take a Molecular Level View
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Kinetic Molecular Theory
Gases consist of particles in
constant random motion.
 Temperature is a measure of
random kinetic energy.
 Pressure is due to collisions of
gas particles with the
container.
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KMT (assumptions)
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Assume that gas particles exert
no attractive forces.
Assume the volume of the gas
particles is negligible (zero).
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PV/nT for Different Gases
(all at 1 atm and 273K)
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O2: 0.08204 Latm/molK
N2: 0.08206 Latm/molK
NH3: 0.08083 Latm/molK
Oxygen and nitrogen behave more ideally
than ammonia.
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V and n (KMT)
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V and T (KMT)
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P and V (KMT)
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Egg in a Bottle
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Using liquid nitrogen to cool the bottle.
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What factors are changing?
What factors are staying constant?
Placing a flame in the bottle.
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What factors are changing?
What factors are staying constant?
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