ACEE219_Week3_new

ACEE219_Week3_new - ACEE 219 ACEE 219 Environmental...

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Unformatted text preview: ACEE 219 ACEE 219 Environmental Chemistry Environmental Chemistry Week 3 March 16, 2010 novation Hall 127 ACEE 219 Spring 2010 HDP 1 Innovation Hall 127 eview of the Last Class eview of the Last Class Review of the Last Class Review of the Last Class 1. Chemical kinetics. ate laws (O 1 t 2 d rder reactions) 2. Rate laws (O, 1 st , 2 nd order reactions). 3. Arrhenius equation (temperature dependence on inetic) kinetic). 4. Estimating reaction constant with different mperature temperature. 5. Biological kinetics (Michaelis-Menten and Monod quations) equations) ACEE 219 Spring 2010 HDP 2 inetics & Reactor Design inetics & Reactor Design Kinetics & Reactor Design Kinetics & Reactor Design Reactants Products Plug Flow Reactor Reactants roducts Products Completely Stirred Tank Reactor ACEE 219 Spring 2010 HDP 3 CHAPTER 3. CHAPTER 3. HEMICAL EQUIRIBRIUM CHEMICAL EQUIRIBRIUM ACEE 219 Spring 2010 HDP 4 ill this reaction go? ill this reaction go? Will this reaction go? Will this reaction go? CaCO 3 (s) + H + → Ca 2+ + HCO 3- hen when, [ CaCO 3 ]=[ H + ]=[ Ca 2+ ]=[ HCO 3- ]=1 mole/liter “ ill this reaction go?” Will this reaction go? “ ow far can it proceed?” How far can it proceed? ACEE 219 Spring 2010 HDP 5 hemical Equilibrium hemical Equilibrium Chemical Equilibrium Chemical Equilibrium A + bB ↔ cC dD aA + bB ↔ cC + dD on on oncentratio A B C oncentratio A C D Co Time D Co Time B • Chemical equilibrium : The state in which the chemical concentrations (or activities) of the reactants and products have no et change over time in a chemical reaction net change over time in a chemical reaction. K = d eq c eq [D] [C] ACEE 219 Spring 2010 HDP 6 b eq a eq [B] [A] K: Equilibrium constant hemical Equilibrium Cont’d hemical Equilibrium Cont’d Chemical Equilibrium, Cont d Chemical Equilibrium, Cont d A + bB ↔ cC dD aA + bB ↔ cC + dD d eq c eq [D] [C] mall K: K = b eq a eq q q [B] [A] • Small K: N 2 (g) + O 2 (g) ↔ 2NO(g) K=10-30- Forward reaction: reaction will be minimal.- Reverse reaction: reaction will almost reach completely. • Large K: HCl ↔ H + + Cl- K=10 3- Forward reaction: reaction will almost reach completely.- Reverse reaction: reaction will be minimal. ACEE 219 Spring 2010 HDP 7 hemical Equilibrium Cont’d hemical Equilibrium Cont’d Chemical Equilibrium, Cont d Chemical Equilibrium, Cont d A + bB ↔ cC dD aA + bB ↔ cC + dD d eq c eq [D] [C] actors affecting chemical equilibrium K = b eq a eq [B] [A] • Factors affecting chemical equilibrium- Addition (or removal) of reactants or products: we will discuss later.- Volume change in a system: not so significant in aqueous reactions.- Temperature: Van’t Hoff equation. ACEE 219 Spring 2010 HDP 8 hemical Equilibrium Cont’d hemical Equilibrium Cont’d Chemical Equilibrium, Cont d Chemical Equilibrium, Cont d • xample alculation of equilibrium concentrations) Example ( Calculation of equilibrium concentrations) In a specified condition, nitrogen gas reacts with oxygen gas and...
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This note was uploaded on 12/06/2011 for the course CHEM 219 taught by Professor Hee-deung during the Spring '10 term at Korea University.

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ACEE219_Week3_new - ACEE 219 ACEE 219 Environmental...

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