Kc and Kp Conversions Hess

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Kc and Kp ConversionsHesss Law in Equilibrium
Constants
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• Today I will be able to
• Convert between Kp and Kc
• Apply Hesss Law to calculating equilibrium
  constants
• Informal assessment monitoring student
  interactions as they complete the practice
  problems
• Formal assessment analyzing responses to the
  practice prblems

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Lesson Sequence

• Evaluate Warm Up
• Explain Notes
• Explore Webquest
• Elaborate Practice Problems
• Evaluate Closure

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Warm Up
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Objectives

• Today I will be able to
• Convert between Kp and Kc
• Apply Hesss Law to calculating equilibrium
  constants

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Homework

• Continue working practice problems and reading
  chapter 5

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Agenda

• Warm Up
• Notes
• Webquest
• Practice Problems
• Closure

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Equilibrium Constants and Hesss Law Notes
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Manipulating Equilibrium Constants

• The equilibrium constant of a reaction in the
  reverse reaction is the reciprocal of the
  equilibrium constant of the forward reaction.

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Manipulating Equilibrium Constants

• The equilibrium constant of a reaction that has
  been multiplied by a number is the equilibrium
  constant raised to a power that is equal to that
  number.

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Manipulating Equilibrium Constants

• The equilibrium constant for a net reaction made
  up of two or more steps can be found from the
  equilibrium constants for the individual steps.
• At 1565 K we have these equilibrium constants

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Example Problem 1
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Answer Problem 1
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Example Problem 2
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Answer Problem 2
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Relationship between Kp and Kc

• Visit the website below to find notes and
  examples
• http//www.chem.purdue.edu/gchelp/howtosolveit/

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Relationship between Kc and Kp

• Substituting PART into the expression for Kp
  for each substance, the relationship between Kc
  and Kp becomes

Kp Kc (RT)?n
Where
?n (moles of gaseous product) (moles of
gaseous reactant)
Hint productsreactants and products over
reactants is a common theme in chemistry.
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Practice Problems
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Closure Practice Problems

• Using the 10th edition of the textbook
• Equilibrium the Equilibrium Constant 14, 15,
  19, 21, 22, 24
• Calculating Equilibrium Constants 28-30, 31-33
• Applications of Equilibrium Constants 37-38,
  41-44, 49

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Closure Practice Problems

• Using the 15th edition of the textbook
• Equilibrium the Equilibrium Constant
• 15,17,21,23,25,27,28
• Calculating Equilibrium Constants 31-33, 35-37
• Applications of Equilibrium Constants 43-45,
  41-44, 47, 49, 51