CH116lecture3P

CH116lecture3P - UMass Boston, Chem 116 CHEM 116 The Ideal...

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UMass Boston, Chem 116 ©H.±Sev ian 1 CHEM 116 The Ideal Gas Model: Its Usefulness and Conditions Where it Breaks Down Lecture 3 Prof. Sevian Today’s agenda z Some uses of the ideal gas equation z Typical gas law problems z Density (“mass density”) of gases z Molar mass determination z Stoichiometry z How gas behavior is measured in the lab z Temperature distributions z Kinetic molecular theory, and how it leads to the combined gas law z Graham’s law of effusion z Partial pressures z Vapor pressure experiments z When the assumptions fail: non-ideal behavior Note: Hopefully we will get through the rest of Chapter 10 (Gases) today. I have included some of Chapter 11 (Intermolecular Interactions) at the end. Last Thursday Today
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UMass Boston, Chem 116 ©H.±Sev ian 2 Announcements FSG’s z FSG’s will start the week of Sept 15 z Shainaz Landge (FSG facilitator) will visit our class today at the end of class to give out a survey and find out what are the best two times for you z I’ll let you know the results of her survey on Thurs Sept 11, and will also post the info on the course website Pre-test z You will take the pre-test during the first hour of lab on either Mon Sept 15 or Weds Sept 17 in M-1-417 from 1:00-2:00. Since this is at the very beginning of lab, you can go directly to the classroom in McCormack first. z If you are not enrolled in Chem 118, please attend lab for the first hour (1:00-2:00) either one of these days to take the pre-test z If you can’t take the pre-test at lab, please make arrangements with me to take the pre-test sometime during the week of Sept 15. After that week is up, it will not be possible to take the pre-test and you will get 0 out of 10 points for the pre-test grade. i>Clickers z On Thursday we will begin using i>clickers. If you own a clicker, bring it to class with you every day, starting this Thursday. z If you do not own a clicker, I will loan you one. You must come by my office (W-4-181) to get it tomorrow or after tomorrow. If you do not return it to me at the end of the semester, you will receive an INC for the course. If you lose it, you can buy another one on amazon.com for around $30. Example of what a clicker question can look like in this course Which of the following statements about distributions of speeds of particles in a gas is true? I. In a gas at a particular temperature, all of the particles move at the same speeds. II. If two different gases are at the same temperature, they have the same distributions of particle speeds. III. For the same gas, the distribution of particle speeds at a higher temperature is more spread out and has a higher average than the distribution at a lower temperature. (A) All of them are true (B) Only II is true (C) II and II are true (D) Only III is true (E) I and III are true
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UMass Boston, Chem 116 ©H.±Sev ian 3 Conclusions about behavior of gas particles 1.
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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CH116lecture3P - UMass Boston, Chem 116 CHEM 116 The Ideal...

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