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Chem 2 - Chemical Equilibrium VIII: Le Chatelier's Principle- Concepts and Reaction Quotient Q

Chem 2 - Chemical Equilibrium VIII: Le Chatelier's Principle- Concepts and Reaction Quotient Q

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Chem 2 - Chemical Equilibrium VIII: Le Chatelier's Principle- Concepts and Reaction Quotient Q

  1. 1. Chemical Equilibrium (Pt. 8) Le Chatelier’s Principle- Concepts and Reaction Quotient Q By Shawn P. Shields, Ph.D. This work is licensed by Dr. Shawn P. Shields-Maxwell under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
  2. 2. “Stressing” a Chemical System Chemical reactions at equilibrium like to stay at equilibrium. Any factor that disrupts the equilibrium state is considered a “stress.”
  3. 3. Le Chatelier’s Principle Le Chatelier’s principle is a qualitative rule for predicting the direction a chemical reaction (at equilibrium) will shift in response to a stress. So what is considered a stress?
  4. 4. Stresses and Le Chatelier’s Principle A stress is some change to the system, which can include • Adding/removing product or reactant • Changing the pressure on a system • Changing the volume of a system • Changing the temperature
  5. 5. Le Chatelier’s Principle When a chemical reaction at equilibrium is stressed, it will shift the equilibrium point in the direction that counteracts the stress applied.
  6. 6. Effects on Equilibrium: Adding/Removing Reactants and Products For example, if more reactant is added, Q will be less than K (Q<K) The reaction will shift toward products (which “uses up” reactants to make product). 𝐊 ∝ 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐫𝐞𝐚𝐜𝐭𝐚𝐧𝐭𝐬
  7. 7. Add N2O4 (g) to the reaction flask. Which direction will the equilibrium shift? 2 NO2 N2O4 Example Problem: Adding N2O4(g)
  8. 8. Add N2O4 (g) to the reaction flask. Which direction will the equilibrium shift? Q is now greater than K (“too many products”) Product gas was added to the flask, so the reaction shifts toward reactants. 2 NO2 N2O4 Example Problem Solution: Adding N2O4(g) 𝐐 ∝ 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐫𝐞𝐚𝐜𝐭𝐚𝐧𝐭𝐬
  9. 9. Next up, Le Chatelier’s Principle and Pressure-Volume Changes (Pt 9)

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  • JamesDanielBaduria2

    Sep. 24, 2017
  • Mikhiz

    Jan. 28, 2018
  • BhawnaGahlot1

    Apr. 14, 2020

Chem 2 - Chemical Equilibrium VIII: Le Chatelier's Principle- Concepts and Reaction Quotient Q

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