L12 - Which Reactions are Reversible? Lecture 12 A....

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1 Lecture 12 Back It Up: Reversibility Key Idea: Any bond or intermolecular interaction that forms can be broken. Which Reactions are Reversible? A. Dissolving glucose in water: C 6 H 12 O 6 (s) C 6 H 12 O 6 (aq) B. Melting glucose: C 6 H 12 O 6 (s) C 6 H 12 O 6 (l) C. Condensing sugar molecules to make starch: n C 6 H 12 O 6 (s) [C 6 H 10 O 5 ] n (s) + n H 2 O (l) D. Decomposing sugar: C 6 H 12 O 6 (s) 6 C (s) + 6 H 2 O (l) E. Burning sugar: C 6 H 12 O 6 (s) + 6 O 2 (g) 6 CO 2 (g) + 6 H 2 O (l) Which ‘Demo’ Reactions are Easily Reversible? * Oxidation of Methylene Blue Dye * Balloon demo: H 2 (g) + O 2 (g) 2 H 2 O (g) * Limiting reagent balloon demo: NaHCO 3 (s) + CH 3 COOH (aq) NaCH 3 COO (aq) + H 2 O ( l ) + CO 2 (g) How do we know how much product is formed if the reverse reaction is also occurring? Not at equilibrium On the way to equilibrium 10 orange fish 14 green fish PHYSICAL EQUILIBRIUM: A goldfish analogy Equilibrium is reached 5 orange, 7 green 5 orange, 7 green # Fish 0 2 4 6 8 10 12 14 Left Tank time 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 time Right Tank
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L12 - Which Reactions are Reversible? Lecture 12 A....

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