u11ohnotes18f2005(1)

u11ohnotes18f2005(1) - Unit 11: Equilibrium / Acids and...

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Unit 11: Equilibrium / Acids and Bases reversible reaction : R Æ P and P Æ R Acid dissociation is a reversible reaction. H 2 SO 4 2 H 1+ + SO 4 1– equilibrium: = -- looks like nothing is happening, however… -- system is dynamic, NOT static Le Chatelier’s principle : When a system at equilibrium is disturbed, it shifts to a new equilibrium that counteracts the disturbance. N 2 (g) + 3 H 2 (g) 2 NH 3 (g) Disturbance Equilibrium Shift Add more N 2 …………………. . H 2 …………………. . NH 3 ………………… Remove NH 3 …………………. . Add a catalyst………………… no shift Increase pressure……………. Rate at which R Æ P Rate at which P Æ R
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Light-Darkening Eyeglasses AgCl + energy Ag o + Cl o ( c l e a r ) ( d a r k ) Go outside… Sunlight more intense than inside light; “energy” shift to a new equilibrium: GLASSES DARKEN Then go inside… “energy” shift to a new equilibrium: GLASSES LIGHTEN In a chicken… CaO + CO 2
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u11ohnotes18f2005(1) - Unit 11: Equilibrium / Acids and...

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