Lecture 2 - 1/8/10 UNIT 1 : Chemical Kinetics (Chapter 16)...

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1/8/10 1 UNIT 1 : Chemical Kinetics (Chapter 16) - elucidate reaction mechanisms 1 The study of reaction rates : how fast a reaction occurs - experimental measurement (the series of steps that make up overall reaction) - how they can be predicted Macroscopic Atomic 1. Reaction rates (Sections 16-1 and 16-2) Rate = the change in concentration of a specific reactant or product per unit time. 2 NO 2 (g) ! 2 NO (g) + O 2 (g) at 300 ºC 2 Consider the reaction of nitrogen dioxide (a reddish- brown gas) to form nitric oxide and oxygen (colorless gases). How could you measure the rate? 3 How many ways did you think of to measure the rate? A) 1 B) 2 C) 3 D) 4 E) 0 Change of pressure in fixed volume Change of volume for fixed pressure Change of color as NO 2 reacts Appearance of IR spectrum for NO NOTE: Two other suggestions were: (i) to measure a temperature change or (ii) to decrease temperature until there was a phase change. While these are good ideas, we would like to measure the rate at the temperature of 300 °C. As we will discuss later on, the rate depends on temperature
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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 2 - 1/8/10 UNIT 1 : Chemical Kinetics (Chapter 16)...

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