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1、Throwing Paper Wads in the Classroom Really Active Student Learning by Jessica and Jeffery Orvis,Georgia Southern University,Almost 2000 students per year in general chemistry Small classes (48 maximum) Table seating in the classroom,Equilibrium,Common misconceptions Equilibrium means equal amounts
2、of reactant and product. A reaction at equilibrium has stopped. Equilibrium can only be achieved by starting with reactants.,Paper Wad Demonstration,Rules Each student wads up two paper wads. You must start and stop as the timekeeper says. Throw only one paper wad at a time. If a paper wad lands nex
3、t to you, you must throw it back.,Pwad (left) Pwad (right),Equal Number of Students on Each Side of the Classroom,Pwad (left) Pwad (right),30 Students on the Left Side 2 Students on the Right Side,Pwad (left) Pwad (right),30 Students on the Left Side 2 Students on the Right Side,Pwad (left) Pwad (ri
4、ght),Six Possible Demonstrations,Addressing Misconceptions,Common misconceptions Equilibrium means equal amounts of reactant and product. No A reaction can be at equilibrium and have more paper wads on the product side of the room. A reaction at equilibrium has stopped. No- The paper wads keep flyin
5、g in both directions even after equilibrium is achieved. Equilibrium can only be achieved by starting with reactants. No Equilibrium can also be achieved when starting with all of the paper wads on the product side of the room.,Rate Limiting Step,Overall Reaction Pwad (table) Pwad (trash) Mechanism Pwad (table) Pwad (Alice) Pwad (Alice) Pwad (Bob) Pwad (Bob) Pwad (Chris) Pwad (Chris) Pwad (Donna) Pwad (Donna) Pwad (trash),Summary,We have a good time. Students are actively involved in the classroom. Misconceptions regarding equilibrium are addressed.,
