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53 Days Until the Harvard Westlake Final Catalyst: 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 reaction coordinate. 3. How is a catalyst related to activation energy? En d
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Page 1: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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

Page 2: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.
Page 3: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

The Briggs-Rauscher Reaction

IO3− + 2H2O2 + CH2(COOH)2 + H+ ICH(COOH)⇌ 2 + 2O2 + 3H2O

Amber Color Navy Blue Color

Page 4: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

Justify – TPS

• Why did the reaction keep changing colors?

Page 5: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

LECTURE 8.4 – LE CHATELIER’S PRINCIPLE

Page 6: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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.

Page 7: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

What is Le Chatelier’s Principle?

Page 8: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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.

Page 9: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

How do concentration, pressure, and temperature impact equilibrium?

Page 10: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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.

Page 11: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 12: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 13: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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

Page 14: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 15: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 16: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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

Page 17: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 18: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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?

Page 19: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

Summarize

Use the following words:• Le Chatelier• Concentration• Pressure• Temperature • Stress

Page 20: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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

Page 21: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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

Page 22: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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)

Page 23: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

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.

Page 24: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.
Page 25: 53 Days Until the Harvard Westlake Final Catalyst: 1.Define what equilibrium is using the rate of the forward reaction and the rate of the reverse reaction.

• Wikispaces!• Screencast-o-matic!• ACS Chemistry Olympiad!• Unit 8 Exam!

Closing Time


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