Ch_13_III_Mechanisms

Ch_13_III_Mechanisms - Part IIMechanisms of Chemical Reactions First part we determined the rate of overall reactions NO g CO g NO g CO g 2 2 Rate

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Sheet1 Page 1 Part II&Mechanisms of Chemical Reactions First part: we determined the rate of overall reactions NO g + CO g . NO g + CO g 2 ()( ) ( ) 2 ( ) Rate Err:520 kNO . from experimental data [ 2 ]2 This part: we examine elementary steps of reaction hWhy this reaction is second-order with respect to [NO2]. h Why this reaction is zero-order with respect to [CO]. h What the reaction mechanism is, that is, the elementary steps of the reaction? t NO g +CO g .NO g +CO g
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sheet1 Page 2 2 ()( ) ( ) 2 ( ) Takes place in two elementary steps (or reactions): NO g +NO g .NO g +NO g (Step 1) 2 ( ) 2 ( ) 3 ( ) ( ) NO g +CO g . NO g +CO g (Step 2) 3 ( ) ( ) 2 ( ) 2 ( )
Background image of page 2
Sheet1 Page 3 Two necessary, but not sufficient, conditions for a correct reaction mechanism: h The sum of the elementary steps = overall reaction h Mechanism predicts correct experimental reaction order h NO g +CO g .NO g +CO g 2 ()( ) ( ) 2 ( ) CHECK: the sum of the elementary steps = overall reaction NO g +NO ( g ).NO g +NO g (Step 1) NO () g +CO g ().NO ( g )+CO ( g ) (Step 2)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sheet1 Page 4 2 ( ) 23 ( ) ( ) 3 22 2 ()+CO g ().NO g +CO 2 ( ) NO g ( ) g NO3 is called an intermediate species or an intermediate Intermediates are very reactive and have very small concentrations. c DigressionH Elementary Steps (Reactions) Rare R 1 NO g +NO g ...NO g +NO g (Step 1) 2 (
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/09/2010 for the course CHEM Chem taught by Professor Petrova during the Spring '09 term at NJIT.

Page1 / 15

Ch_13_III_Mechanisms - Part IIMechanisms of Chemical Reactions First part we determined the rate of overall reactions NO g CO g NO g CO g 2 2 Rate

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online