20-equilibrium - Exam #2 Results Class Average = 77 (Great...

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1 Week 9 CHEM 1310 - Sections L and M 1 Exam #2 Results Class Average = 77 (Great Job!) Week 9 CHEM 1310 - Sections L and M 2 Exam #2 Results 4 Perfect Scores!
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2 Week 9 CHEM 1310 - Sections L and M 3 Ch 6: Chemical Equilibrium What is Equilibrium? Equilibrium Constant, K Equilibrium Expressions Involving Pressures Activity Heterogeneous Equilibria Applications of Equilibrium Constant Solving Equilibrium Problems Le Chatelier’s Principle - very important Equilibria Involving Real Gases Week 9 CHEM 1310 - Sections L and M 4 What is Equilibrium? Equilibrium is the phenomenon that occurs when the rate of the forward reaction equals the rate of the reverse reaction.
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3 Week 9 CHEM 1310 - Sections L and M 5 What is Equilibrium? Example H 2(g) + I 2(g) 2 HI (g) Forward Rxn Reverse Rxn Forward Rxn: Product = HI Reverse Rxn: Products = H 2 and I 2 At equilibrium, the concentrations of all reactants and products remain constant with time. [HI] = constant; [H 2 ] = constant; [I 2 ] = constant Week 9 CHEM 1310 - Sections L and M 6 What is Equilibrium? Notice how the concentrations of products for the forward and reverse reactions are not necessarily equal at equilibrium!
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Week 9 CHEM 1310 - Sections L and M 7 What does equilibrium look like in a chemical system? N 2 O 4 2 NO 2 colorless brown Equilibrium Closed system reaches the same equilibrium concentrations whether the reaction starts with the N 2 O 4 or the NO 2 ! Equilibrium Characteristics Week 9 CHEM 1310 - Sections L and M 8 The Equilibrium Constant a A + b B c C + d D Equilibrium Constant K = [C] c x [D] d [A] a x [B] b Characteristics Exponents are coefficients from balanced chemical equation. Units for K will vary depending upon coefficients.
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20-equilibrium - Exam #2 Results Class Average = 77 (Great...

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