Lecture 3 - 1/11/10 Setting/testing iClicker 1. Press and...

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1/11/10 1 11 1. Press and hold the power button until a blue light flashes 2. Enter the frequency code: CA 3. When the frequency has been correctly set, a green light will flash and the blue light becomes constant 4. When you have voted successfully (vote has been received and confirmed), the "Vote Status" light on your remote will flash green. 5. You can change responses as long as the polling remains active. Setting/testing iClicker 12 What is the general (average) rate of reaction during the time interval 50 s to 100 s? 100 to 150 s? 150 to 200 s? 200 to 250 s? 250 to 300 s? Is the average rate of reaction the same or different during these time intervals? Does it depend on the concentration of NO 2 ? 13 What is the general (average) rate of reaction during the time interval 50 s to 100 s? A) -2.8 ! 10 -5 B) 1.4 ! 10 -5 C) +2.8 ! 10 -5 D) -1.4 ! 10 -5 E) 7.0 ! 10 -6 Rate = ! 1 2 " [NO 2 ] " t = ! 1 2 [NO 2 ] f -[NO 2 ] i t f - t i = ! 1 2 (0.0065 ! 0.0079) M (100 ! 50) s = 1.4 # 10 ! 5 M/s Important points -Reactants (-) vs. products (+) - Stoichiometry - Time interval 14 Time Interval/s [NO 2 ] i /M [NO 2 ] f /M Rate/M s -1 0-50 0.0100 0.0079 2.1 ! 10 -5 50-100 0.0079 0.0065 1.4 ! 10 -5 100-150 0.0065 0.0055
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This note was uploaded on 04/22/2010 for the course CHEM 102 taught by Professor Brown during the Winter '10 term at University of Alabama at Birmingham.

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Lecture 3 - 1/11/10 Setting/testing iClicker 1. Press and...

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