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Unformatted text preview: of forward reaction New Equilibrium: Concentration of A decreases; concentrations of B, C and D increase. Example: Complete the table for the equilibrium shown belo w: ¾¾
N2 (g) + O2 (g) ¬¾ 2 NO (g)
Stress increase O2 decrease O2 increase NO decrease NO Shift [N2] 6 [O2] [NO] Chemistry 52 Chapter 16 CHANGES IN EQUILIBRIUM Effect of Temperature
· To predict the effect of temperature on equilibrium, heat can be treated as a reactant in endothermic reactions and a product in exothermic reactions. ¾Add ¾ t¾ ¾ h ea ®
N 2 (g) + O 2 (g) + heat ¬¾ 2 NO (g)
¾ Endothermic Re
¬¾move¾ ¾ ¾ heat¾ Ad
¬¾d hea¾ ¾ t¾ ¾¾
2 SO 2 (g) + O 2 (g) ¬¾ 2 SO 3 (g) + heat ¾ Exothermic ¾Rem¾ heat¾ ¾ ove ¾ ®
Effect of Volume & Pressure
· Changes in vo lume only affect reactions when one or more reactants or products are in the gas phase. In these cases, reducing the volume has the effect of increasing the pressure.
· Increasing the pressure shift s the equilibrium to the side wit h the least number of gas mo lecules (mo les). Decreasing the pressure shifts the equilibrium to the side with the largest number of gas mo lecules (mo les). Example: Consider the equilibrium shown below: ¾¾
2 S O 2 (g) + O 2 (g) ¬¾ 2 SO 3 (g)
Stress increase temperature decrease temperature increase pressure decrease pressure Shift [SO2] 7 [O2] [SO3] Chemistry 52 Chapter 16 CHANGES IN EQUILIBRIUM Effect of Catalyst...
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