L29S07_Equi_mass_action 04-02-07

L29S07_Equi_mass_action 04-02-07 - Chem1A, L 29:...

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Unformatted text preview: Chem1A, L 29: "Equilibrium, Mass Action" Thermodynamic Parameters Previously kJ/mol J/K mol kJ/mol Hf S Gf Hf S C(s) Mg(s) kJ/mol J/K mol Gf kJ/mol H2(g) O2(g) 0 0 131 205 0 0 0 0 6 33 0 0 569 CO2(g) 394 214 394 H2O(g) 242 189 229 H2O(l) 286 70 257 A.Pines,M.Kubinec,UCB MgO(s) 602 27 MgO(s) C2H2(g) 227 CH3CH2OH(l) 278 201 209 161 175 L24-5 G = H -TS H > 0 Endothermic H > 0 Endothermic H S Free Energy and Reactions H S G <0 <0 Exothermic More order No T Low T High T All T H S K (s) + H20 (l) K+ (aq) + OH- (aq) + H2 (g) aq) aq) C2H5OH (l) + 3 O2 (g) - + - 2 CO2 (g) + 3 H20 (l) AlBr3 (s) + - + + + + - - + L29-1 L24-8 S > 0 Less order S > 0 Less order Al (s) + 3/2 Br2 (l) 2 MgO (s) + C (s) 2 Mg (s) + CO2 (s) L24-7 A.Pines,M.Kubinec,UCB A.Pines,M.Kubinec,UCB 2001 A.Pines,M.Kubinec,UC Equilibrium Phase Change H2O (l) H2O (g) Gas Phase 2 NO2 (g) Law of Mass Action Summary Pi N2O4 (g) (g AgCl (s) aA+bB cC+dD aA+bB c cC+dD d [C] [D] Products Reaction Q= = K(T) at Equ. Quotient Reactants [A]a [B]b Q<K [Xi] L17-4 Aqueous HAc (aq) + H2O (l) aq) Heterogeneous Ag+ (aq) + Cl- (aq) A.Pines,M.Kubinec H3O+ (aq) + Ac (aq) Products A.Pines,M.Kubinec Q=K EQUILIBRIUM Q>K Reactants L17-5 Vapor Pressure of Water P Equilibrium Approach and Maintenance H2,O2 Unstable H2O (l) equ. equ. H2O (g) Pvap P V L G T Monotonic A.Pines,M.Kubinec Q = PH2O = Pvap(T) = K H2O (g) equ. equ. Stable Pi, [Xi] Stable H 2O H2O (l) Pvap S Q = 1/PH2O = 1/ Pvap(T) = K' 1/P UC Regents Clock Oscillatory Chaotic L17-10 L24-6 Equilibrium aA+bB Phase Change H2O (g) H2O (l) Gas Phase 2 NO2 (g) N2O4 (g) (g H3O+ (aq) + Ac (aq) AgCl (s) [Xi] L29-3 cC+dD Pi Aqueous HAc (aq) + H2O (l) aq) Heterogeneous Ag+ (aq) + Cl- (aq) 2001 A.Pines,M.Kubinec,UC A.Pines,M.Kubinec,UCB 1 Chem1A, L 29: "Equilibrium, Mass Action" Law of Mass Action aA+bB c cC+dD d [C] [D] Products Reaction Q= = K(T) at Equ. a b Quotient Reactants [A] [B] Q<K Products 2001 A.Pines,M.Kubinec,UC Q=K EQUILIBRIUM Q>K Reactants L29-4 Vapor Pressure of Water P H2O (l) equ. equ. H2O (g) Pvap P V L G T L29-5 Q = PH2O = Pvap(T) = K K = 0.03 @ 25 C equ. equ. H2O (g) H2O (l) Pvap S Q = 1/PH2O = 1/ Pvap(T) = K' 1/P 2001 A.Pines,M.Kubinec,UC ChemQuiz 29.1 H2O (l) H2O (g) P S L G T Which is true under standard conditions ? 1) Q < K 2001 A.Pines,M.Kubinec,UC 2) Q = K 3) Q > K L29-6 A.Pines,M.Kubinec,UCB 2 Chem1A, L 29: "Equilibrium, Mass Action" ChemQuiz 29.2 H2O (l) H2O (g) P S L G T K How does K vary with Temperature ? K K 1) T 2001 A.Pines,M.Kubinec,UC 2) T 3) TL29-8 Approach and Maintenance H2,O2 Equilibrium Unstable Stable Pi, [Xi] Stable H2O Monotonic 2001 A.Pines,M.Kubinec,UC Clock Oscillatory Chaotic L29-10 ChemQuiz 29.3 For the reaction: I2(s) I2 (g) what happens to the vapor color intensity when I2 (s) is added ? 1) Increases 2001 A.Pines,M.Kubinec,UC 2) Same 3) Decreases L29-11 A.Pines,M.Kubinec,UCB 3 Chem1A, L 29: "Equilibrium, Mass Action" ChemQuiz 29.4 For the reaction: I2(s) I2 (g) what happens to the vapor color intensity when T is raised ? 1) Increases 2001 A.Pines,M.Kubinec,UC 2) Same 3) Decreases L29-13 Lecture Complete 2001 A.Pines,M.Kubinec,UC L29-15 A.Pines,M.Kubinec,UCB 4 ...
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