chem102-3bc - C102-lecture 3b-W11 Chem 102- 02 PE 120 page...

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C102-lecture 3b-W’11 page 1 of 8 1/19/11 Chem 102- 02 PE 120 lecture 2c-Winter, 2011 Lec 3b Test #1 Friday Jan 28 A guide will be posted/or emailed Chapters: 8 -10. Last week: 0) Went over the pop quiz 1) Review intermolecular interactions 2) interpret figure 9.20 3) polar vs non polar 4) introduced Gases (chapter 10) Today: Gases 1) Gas pressure 2) Gas properties 3) Kinetic-molecular model 4) Boltzmann distribution 5) Gas Law equations 6) LECTURE 3b Chapter10: GASES: (1) Gas pressure. Pressure (P) = Force (F) / area (A) SI units: N/m 2 (Pascal, Pa) More convenient: atmosphere, atm 101,000 Pa = 1 atm in Thermo: 1 bar = 100,000 Pa so, 1 Bar 1 atm Lab: we use a barometer to measure pressure (draw it) convenient unit: mm Hg (“millimeters of mercury”); or Torr 760 mmHg = 760 Torr = 1 atm (look at other units like psi) 14.7 psi = 1 atm (2) properties of gases:
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C102-lecture 3b-W’11 page 2 of 8 1/19/11 a) compressible b) exert pressure, equal in all directions c) mix completely with one another d) can be described by: Pressure, Temperature, volume and #moles (P,T, V, and n) 3) Kinetic Molecular Theory : gives a microscopic view of an ideal gas : solids liquids and gases all have molecules in constant motion but solids: molecules are in same vicinity even if they vibrate liquids: molecs glide past each other but are in vicinity gases: molecules fly past one another, more particularly: 1. gases composed of tiny particles << distance between them (ie vol of gas mostly empty space) 2. gas particles in random motion –random velocities boink! 3. intermolecular forces are negligible (except when colliding) 4. all collisions are elastic (ie KE is conserved) + 5. Average KE of gas α T – at const T, average KE const. Remember KE = 1/2 mv 2 kinetic energy (joules) mass (kg) velocity (m/s) Boltzmann Distribution The higher the KE , the higher the v Since KE α T the higher the T, the higher the v 4) Boltzmann Distribution Figure 10.5 discuss this -shows the effect of T on average velocity
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This note was uploaded on 03/05/2011 for the course CHEM 102 taught by Professor Gregsantillan during the Spring '11 term at California State University Los Angeles .

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chem102-3bc - C102-lecture 3b-W11 Chem 102- 02 PE 120 page...

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