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Approaching Equilibrium Lesson 1

Learn about approaching equilibrium in reversible chemical reactions, understanding rates of reactants and products, characteristics of a system at equilibrium, and conditions necessary for equilibrium.

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Approaching Equilibrium Lesson 1

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  1. Approaching Equilibrium Lesson 1

  2. Approaching Equilibrium Many chemical reactions are reversible if the activation energy is low and the system is closed. Reactants⇌Products

  3. Approaching Equilibrium Many chemical reactions are reversibleif the activation energy is low. Reactants⇌Products Forward Reaction is left to right Reverse Reaction is right to left

  4. Lets see what happens to some reactants if they are placed in a reaction vessel and allowed to react.

  5. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  6. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  7. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  8. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  9. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  10. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate

  11. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate Are Equal

  12. Approaching Equilibrium Products Reactants Forward Rate Reverse Rate Are Equal Are Constant

  13. Graphing the Approach to Equilibrium product  Concentration reactant Time

  14. Graphing the Approach to Equilibrium reactant  Concentration product Time

  15. Graphing the Approach to Equilibrium Forward rate  Concentration Reverse rate Overall rate Time

  16. Approaching Equilibrium Reactant concentrationsstart high and decreaseas the reaction proceeds. The forward rate, which depends on collisions of the reactants, also decreases. Product concentrationsstart at zero andincreaseas the reaction proceeds. The reverse rate, which depends on collisions of the products, also increases. Eventually the forward rateis equal to the reverse rateand the concentrationsare constant.This is equilibrium.

  17. Characteristics of a System at Equilibrium The Forward rate= The Reverse rate The Reactant and Product concentrations are constant The Macroscopic(observable) propertiesare constant The system is Dynamic as the forward and reverse reactions continue. The equilibrium can be approachedfrom starting with reactants or starting with products.

  18. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate

  19. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate

  20. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate

  21. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate

  22. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate

  23. Approaching Equilibrium from Products Products Reactants Forward Rate Reverse Rate Are Equal Are Constant Same as before

  24. If you startwith productsall aspects of the approach to equilibrium arereversed Productsand Reverse Ratedecrease Reactants and Forward Rateincreases

  25. Conditions Necessary for Equilibrium Closed system Constanttemperature Ea is low so the reaction is reversible

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