110_Fa11_LUZ-week8ST (1)

110_Fa11_LUZ-week8ST (1) - Week 8 Gas Molecules...

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Jensen Chem 110 Chap 10 Page: 1 Week 8: Lectures 22 – 24 Lecture 22: W 10/12 Lecture 23: F 10/14 (Special lecture by Dr. Ben Lear) Lecture 24: M 10/17 Reading: BLB Ch 10.1 – 10.9 Homework: BLB 10: 23, 30, 45, 5, 71, 75, 82, 83, 84; Supp 10: 1 – 15 Reminder: No Angel Quiz on Thur 10/13 ALEKS Objective 8 due on Tue 10/18 Angel Quiz 8 due on Thur 10/20 Jensen Office Hour: 501 Chemistry Building Thursday 10/13: cancelled Tuesday 10/18: 10:30 – 11:30 am Jensen Chem 110 Chap 10 Page: 2 Gas Molecules’ Characteristics ! Gas molecules are constantly moving expand in whatever volume is available mix completely with one another ! They are far apart (10 times as far as they are big) can be easily compressed ! They move in straight lines ! They collide with each other ! They collide with walls: pressure ! Higher temperature yields faster motion ! Lower temperature yields slower motion and eventually condensation Gases are described in terms of: pressure (P), temperature (T), volume (V), # moles (n) All gases behave similarly at low pressure Gases will mix in all proportions with other gases to form homogeneous mixtures

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Jensen Chem 110 Chap 10 Page: 3 Pressure Pressure: force per unit area Force: Kg•m•s –2 , or Newton (N); Unit area: m 2 • SI unit for pressure: 1 N•m –2 = 1 Pa (Pascal) Standard Atmospheric Pressure**: 1 atm = 1.013 x 10 5 Pa 1 atm = 760 torr (or mm Hg) [1 atm = 14.7 lb/in 2 ] Jensen Chem 110 Chap 10 Page: 4 Measuring Pressure Barometer used to measure P atm The key idea is balance force on area P atm " height (h) of column of liquid Measure P in terms of height of Hg 1 atm = 760 torr “=” 760 mm Hg [ know this conversion!] P atm P Hg P atm = P Hg d l = density of liquid (here: Hg) g = gravitational constant P atm = constant x h P atm = F atm /A P Hg = F l /A = gd l h so,
Jensen Chem 110 Chap 10 Page: 5 Mercury Manometer Used to measure the difference in pressure between open or closed end and that of a gas in a vessel. Closed Ended: P g = h (mm Hg) Open Ended: Which P is greater? P gas = P atm __ P h P gas = P atm __ P h Jensen Chem 110 Chap 10 Page: 6 Example: The height of the column of mercury in the open-ended manometer shown is found to be 65 mm. If the external pressure is 1.06 atm, what is the gas pressure inside the bulb?

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