CHEM123_Package - Agenda Equilibrium Acid/Bases...

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Agenda Equilibrium Acid/Bases Electrochemical Cells Packing Rate Laws Provide general understanding, your job is to then to understand the underlying concepts apply to your many problem sets and practice midterms
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Equilibrium
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What is Keq The equilibrium constant is merely a value that describes the ratio of products to reactants The actual concentrations of reactants and products of the system at equilibrium varies; however, the ratio will always be the same
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Le Chatelier’s principal What is equilibrium? Why do reactions reach equilibrium? Imagine a vessel with limited space. Molecules are flying around, colliding with each other. Some are products and some are reactants. A ↔ B + C When B and C collide in the right orientation, they become A. A is spontaneously decomposing into B and C. The vessel can only hold a certain amount of molecules. If there is too many products, it will be crowded , more collisions will happen and they will transform into reactants. If there is not enough products, A will be allowed to continuously decompose into B & C.
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Le Chatelier’s Principle Le chatelier’s principle: when you change a system, the system will act to reverse that change to some degree A < -- > B + C Adding reactants drives the reaction towards the product (i.e. adding A will increase the amounts of B & C as more A decomposes) Adding products drives the reaction towards the reactants (adding B & C makes more collisions possible and creates A) Change in the pressure and volume in the reaction vessel: Increase volume/Decrease pressure Note: *pressure volume relationship visit site: http://www.grc.nasa.gov/WWW/K-12/airplane/boyle.html
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Le Chatelier’s Principle Adding reactants drives the reaction towards the product (i.e. adding A will increase the amounts of B & C as more A decomposes) Adding products drives the reaction towards the reactants (adding Change in the pressure and volume in the reaction vessel: Increase volume/Decrease pressure reaction proceeds towards side with more molecules (to fill up the empty space or to increase pressure to reverse the effect of the decrease in pressure) Decrease volume/Increase pressure reaction proceeds towards side with less molecules All of these changes do not affect the equilibrium constant
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Le Chatelier’s Principle changing temperature Changing temperature will change the equilibrium constant How will increasing the temperature affect exothermic reaction? -Reaction goes forwards -Reaction goes reverse
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Answer Reaction will go in reverse - In an exothermic reaction, heat is product A + B ↔ C + heat - Increasing heat = increasing product, and will drive the reaction towards reactants - You can also think of it as that endothermic reactions uses energy/heat; - increasing the temperature provides extra energy into the system; - the system will act to use up this extra energy and will drive it towards whichever direction is an endothermic reaction
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CHEM123_Package - Agenda Equilibrium Acid/Bases...

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