HalfLifeActivationEnergy

HalfLifeActivationEnergy - What is Half-Life Reaction...

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Unformatted text preview: What is Half-Life? Reaction Half-Life The time it takes for the concentration of reactants to decrease by one-half [A] t = k(T)t + [A]-1-1 [A] th Order 1 st Order 2 nd Order Rate Law Integrated Rate Law Half Life Rate=k(T) Rate=k(T)[A] Rate=k(T)[A] 2 [A] t = -k(T)t + [A] ln[A] t = -k(T)t + ln[A] t ! = [A] 2k(T) t ! = k(T) t ! = k(T) 1 Reaction Laws Overview 0.693 ln 2 Example SO 2 Cl 2 (g) ! SO 2 (g) + Cl 2 (g) The disappearance of SO 2 Cl 2 is monitored experimentally 0.035 80 0.081 60 0.187 40 0.433 20 1.000 [SO 2 Cl 2 ] (M) Time (min) 100 0.015 What should you do with this data? What is the order of the reaction in SO 2 Cl 2 ? Look at the plots of concentration vs. time 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 20 40 60 80 100 Time (min) [SO 2 Cl 2 ] The reaction is first order in SO 2 Cl 2- Slope = 0.042 min-1 = k(T) [ S O C l 2 ] Time (min) What is the half life of the reaction? t 1/2 = ln 2 k(T) = 0.693 0.042 min-1 = 16.5 min After 16.5 min, half of the SOCl 2 is reacted 1.0M 16.5 0.5M 0.2M 33 49.5 0.125M 66 0.063M What is the order of the reaction in SO 2 Cl 2 ? Look at the plots of concentration vs. time 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 20 40 60 80 100 Time (min) [SO 2 Cl 2 ] The reaction is first order in SO 2 Cl 2- Slope = 0.042 min-1 = k(T) [ S O C l 2 ] Time (min) What is the half life of the reaction?...
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This note was uploaded on 01/09/2011 for the course SCIENCE 12084 taught by Professor Mrdavidbyrum during the Spring '10 term at Harrison College.

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HalfLifeActivationEnergy - What is Half-Life Reaction...

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