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53 Days Until the Harvard Westlake FinalCatalyst:1. Define what equilibrium is using the rate of the
forward reaction and the rate of the reverse reaction.
2. What is activation energy? Label it on a reactioncoordinate.
3. How is a catalyst related toactivation energy?
End
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The Briggs-Rauscher Reaction
IO3− + 2H2O2 + CH2(COOH)2 + H+ ICH(COOH)⇌ 2 + 2O2 + 3H2O
Amber Color Navy Blue Color
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Justify – TPS
• Why did the reaction keep changing colors?
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LECTURE 8.4 – LE CHATELIER’S PRINCIPLE
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Today’s Learning Target
• LT 8.7 – I can define Le Chatelier’s principle and use this principle to predict how concentration, temperature, and pressure will impact a given equilibrium.
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What is Le Chatelier’s Principle?
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Le Chatelier’s Principle • “If a system at equilibrium
is disturbed by a change in temperature, pressure, or concentration, the system will shift its equilibrium position so as to counteract the effect of the stress.”
• If equilibriums are disturbed, it will shift to restore that equilibrium.
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How do concentration, pressure, and temperature impact equilibrium?
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Le Chatelier’s Principle and Concentration
• If we add more of a product/reactant, then our reaction will shift to the other side in order to compensate for this new amount.
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Class Example
• I have the following equilibrium:H2O H⇌ 3O+ + OH-
• If I add H3O+, then will my reaction shift to the right or to the left?
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Table Talk• I have the following equilibrium:
CaCO3 CaO + CO⇌ 2
• If I add CaCO3, then will my reaction shift to the right or to the left?
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Le Chatelier’s Principle and Volume/Pressure
• If we increase pressure, the reaction shifts to the side with less molecules
• If we decrease pressure, the reaction shifts to the side with more molecules
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Class Example
• I have the following equilibrium:N2 (g) + 3H2 (g) 2NH⇌ 3 (g)
• If I increase the pressure, then will my reaction shift to the right or to the left?
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Table Talk• I have the following equilibrium:
CaCO3 CaO + CO⇌ 2
• If I decrease pressure, then will my reaction shift to the right or to the left?
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Le Chatelier’s Principle and Temperature• When a reaction is endothermic, heat is listed as a
reactant.Heat + Reactants Products
• When a reaction is exothermic, heat is listed as a product.
Reactants Products + Heat• Therefore, treat heat like a reactant or a product
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Class Example
• I have the following equilibrium:N2 (g) + 3H2 (g) 2NH⇌ 3 (g) + 92 kJ
• If I increase the temperature, then will my reaction shift to the right or to the left?
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Table Talk• I have the following equilibrium:
556 kJ + CaCO3 (s) CaO (s) + CO⇌ 2 (g)
• If I decrease the temperature, then will my reaction shift to the right or to the left?
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Summarize
Use the following words:• Le Chatelier• Concentration• Pressure• Temperature • Stress
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White Board Questions• State whether it will shift to the left, right, or stay the
same based on the given conditionsNaOH (aq) + HCl (aq) NaCl (s) + H2O (l)
(1)Add HCl(2)Remove NaOH(3)Add NaCl(4)React NaOH with HNO3
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White Board Questions• State whether it will shift to the left, right, or stay the
same based on the given conditions4HCl (g) + O2 (g) 2H2O (g) + 2Cl2 (g) + 113 kJ • Increase pressure • Decrease temperature• Add H2O
• Remove O2
• Add HCl
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White Board Questions• State whether it will shift to the left, right, or stay the
same based on the given conditionsNaCl (aq) Na+ (aq) + Cl- (aq) + 426 kJ
(1)Decrease the temperature (2)Add Na+
(3)Remove Cl-
(4)Add HCl (think about what the compound contains)
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Screencast-o-matic• Today, students get to the be the teacher!• You will have an opportunity to teach the world
how Le Chatelier’s Principle works by using screencast-o-matic to solve problems involving Le Chatelier’s Principle and record them.
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• Wikispaces!• Screencast-o-matic!• ACS Chemistry Olympiad!• Unit 8 Exam!
Closing Time