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Lecture 60

CHEM 107 Lecture 60: 5-3-17-Temperature
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4 Pages
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Department
Chemistry
Course Code
CHEM 107
Professor
Mallory Monique Mentele

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5-3-17-Temperature Wednesday, May 3, 2017 11:00 AM Changing the Temperature Exothermic reaction: A + B←→ C + D + heat Negative ∆H Endothermic reaction: A + B + heat ←→ C + D Positive ∆H Increase in temperature (add heat) Exothermic: equilibrium shifts towards the reactant side Endothermic: equilibrium shifts towards the product side Decrease in temperature (remove heat) Exothermic: equilibrium shifts towards the product side Endothermic: equilibrium shifts towards reactant side Volume and Pressure Changes *Volume and pressure are inversely related Effects only gas species in equilibrium Reducing the volume (increasing the pressure) will shift the reaction to the side with the fewest moles of gas Increasing the volume (decreasing the pressure) will shift the reaction to the side with most moles of gas -If gas coefficients sum up to be the same on both sides of reaction, there is no effect Practice Questions: 1. 2SO +2O ←→ 2SO 3 How will the following affect an equilibrium mixture of the three gases? O is added to the system 2 A. Shifts in the direction toward more reactants B. Shifts in the direction toward more products C. No effect 2. 2SO + 2 ←→ 22O 3 How will the following affect an equilibrium mixture of the three gases? The reaction mixture is heated A. Shifts in the direction toward more reactants B. Shifts in the direction toward more products C. No effect 3. 2SO + 2 ←→ 22O 3 How will the following affect an equilibrium mixture of the three gases? The volume
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