Week 10-1 Lecture Notes.docx - Chem 125 Lecture Notes Week 10-1 Learning Objectives Integrated rate law as the 2nd method to find the rate of reactions

Week 10-1 Lecture Notes.docx - Chem 125 Lecture Notes Week...

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Chem 125 Lecture Notes Week 10-1 Learning Objectives: Integrated rate law as the 2 nd method to find the rate of reactions, Effect of temperature on rate Predict rate laws for chemical reactions from reaction mechanisms in the rate-limiting step approximation. PQ2 Hydrogen iodide, HI, decomposes in the gas phase to produce hydrogen, H 2 , and iodine, I 2 . The value of the rate constant, k , for the reaction was measured at several different temperatures and the following graph was plotted. What is the value of the activation energy (in kJ/mol) for this reaction? a) -2.13 x 10 4 J b) 1.177 J c) 1.77 x 10 5 J d) -1.77 x 10 5 J The half - life of a reaction is the time required for the reactant concentration to decrease to one- half its initial value. 1
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Chem 125 Lecture Notes Week 10-1 Example: What is the half-life (in hours) for the decomposition of O 3 when the initial concentration of O 3 is 2.35 x 10 –6 M ? The rate constant for this second-order reaction is 50.4 L/mol/h. PQ1: The half–life of a reaction of compound A to give compounds D and E is 8.50 min when the initial concentration of A is 0.150 mol/L. How long (in min) will it take for the concentration to drop to 0.0300 mol/L if the reaction is first order with respect to A? a) 0.0815 min b) 19.7 min c) 2.31 min d) 12 min The effect of Temperature on rate (Arrhenius Equation): -
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