# 2014-02-18 Recitation (initial rates and initial-rate method)

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2014-02-18 Recitation Mechanism & Rate Law Definitions: Mechanism vs. overall reaction Elementary step vs. overall reaction Intermediate vs. catalyst Example For the following mechanism, (1) write the overall reaction, (2) identity the intermediate and the catalyst, and (3) write the rate law for each elementary step and the overall reaction !"#"+ %&→ !"# + %#&!"#"+ %#&→ !"# + #"+ %&
Rate law Rate of reaction Initial Rates and Initial Condition
Example When (!")*"and +,(-are mixed together, (!"(-"forms. The reaction is (!")*"+ 2(-&→ (!"(-"+ 2)*&I measured the concentration of (!")*", (-&, and (!"(-"at different time throughout the experiment… Time (sec) 0 10 20 0(!")*"1(M) 5.00 4.20 3.96 0(-&1(M) 4.00 2.40 1.92 0(!"(-"1(M) 0.00 0.80 1.04 What is the initial rate of the reaction? Using (!"30 3.81 1.63 1.19
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Example 1 I want to find the rate law for the reaction between methanol ((!2#!) and acetic acid ((!2(##!). The reaction is (!2#! + (!2(##! → (!2(##(!2+ !"#I ran the experiment using three different initial concentrations and measured the initial rates.