Student Exploration: Gizmos Equilibrium and Concentration

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Vocabulary: chemical equilibrium, concentration, equilibrium, equilibrium constant, reaction quotient, reversible reaction Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Gary has $5,0... 00 in his bank account and earns a modest salary. Every month he pays for rent, food, utilities, and entertainment. A. How will Gary’s account change if he saves more than he spends? It will increase. B. How will Gary’s account change if he spends more than he saves? It will increase. C. What happens if Gary spends exactly as much as he saves? It will stay the same. Gizmo Warm-up If Gary spends exactly as much as he earns, his savings will be in equilibrium. Equilibrium occurs when two opposing processes occur at the same rate, leading to no net change. In the Equilibrium and Concentration Gizmo, you will investigate how equilibrium can occur in chemical reactions. To begin, check that Reaction 1 is selected. Set Moles NO2 to 8 and Moles N2O4 to 0. 1. Click Play ( ) and observe the colliding molecules. What do you notice? The NO2 molecules are free floating closer to the surface of the fluid in the beaker. The NO2 molecules start to bond forming N2O4 molecules. After a while, the N2O4 molecules start to break apart again into NO2 molecules. The fluid they reaction is occurring in is also decreasing and rising intermediately but leaning more to decreasing than increasing. In the Gizmo, a blue flash appears every time two reactants combine to form a product. A red flash appears every time a product dissociates into reactants. 2. Click Reset ( ), and set Moles NO2 to 0 and Moles N2O4 to 8. Click Play. [Show More]

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