Chemistry GT 6/9/15.  No Drill – drill Quiz  Take out a sheet of notebook paper. On it, write the Questions AND Answers for these drills:  5/5, 5/28.

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Presentation transcript:

Chemistry GT 6/9/15

 No Drill – drill Quiz  Take out a sheet of notebook paper. On it, write the Questions AND Answers for these drills:  5/5, 5/28  When done, please empty your folder (in the back)  HW: pg. 7 Potential Energy Diagrams & pg. 8 Reaction Rate Review

 Objectives  IWBAT  explain chemical equilibrium as a dynamic system.  use Le Chatelier’s Principle to predict the effects of changes to a chemical system.  Describe the factors that affect reaction rate.  Explain reaction rate using Collision Theory

  Drill  Finish Rxn Rate Notes  Practice with Energy Diagrams  More about K eq  Closure Agenda

Rxn Rates PPT

  Back of pg. 7 Practice

 Label each diagram with the following:  Endothermic or exothermic  Activation Energy   H (change in heat)  Energy of reactants  Energy of Products

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  Explain the changes that happen when a catalyst is added.

Equilibrium Constant  Expresses the relative concentrations of reactants and products at equilibrium by using an “equilibrium constant” – K eq  a A + b B  c C + d D

 Equilibrium Constant Only include gases and aqueous solutions when writing equilibrium constants Solids and liquids are not included They can be represented with a [1] or left out entirely

 Types of Equilibrium Problems  Quantitative  K eq < 1, then the reaction is reactant-favored at equilibrium  COCl 2(g)  CO (g) + Cl 2(g)  K eq = 2.2 x  Reactant-favored

 Types of Equilibrium Problems  K eq > 1, then the reaction is product- favored at equilibrium  2 NO 2(g)  N 2 O 4(g)  K eq = 2.15 x 10 2  Product-favored

 K eq and Stresses on the system  K eq does not change with change in concentration  It will change based on change in temperature and change of pressure

  Quantitative (uses the K eq equation)  Write the equilibrium expression for the following reaction  2 SO 2(g) + O 2(g)  2 SO 3(g) Types of Equilibrium Problems [SO 3 ] 2 [SO 2 ] 2 [O 2 ] K eq = ____________

 Types of Equilibrium Problems  If.0172 M of O 2,.0250 M of SO 2 and M of SO 3 at equilibrium, calculate K eq [SO 3 ] 2 [SO 2 ] 2 [O 2 ] K eq = ___________ = [.00140] 2 [.0250] 2 [.0172] _______________ K eq =.18 (reactant favored)

 Exit Ticket  Given the following reaction:  Use Le Chatelier’s principle to determine what would happen if the following changes were made  Increase the concentration of N 2  Increase the concentration of NH 3  Remove NH 3 from the reaction after it is made