Equilibrium and Concentration Gizmo ( all answers correct ) VERIFIED < DOWNLOAD TO SCORE A >

Student Exploration: Equilibrium and Concentration Vocabulary: chemical equilibrium, concentration, equilibrium, equilibrium constant, reaction quotient, reversible reaction Prior Knowledge Questio ns (Do these BEFORE using the Gizmo.) Gary has $5,000 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 decrease. 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 molecules move and collide. Occasionally there is a blue or red flash. 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. What do you notice now? There are more red flashes than blue. 3. When a reaction can proceed in either direction, it is a reversible reaction. Based on what you have observed, is the synthesis of NO2 into N2O4 a reversible reaction? Explain. I know the synthesis of NO2 into N2O4 is a reversible reaction because both the forward reaction (blue flashes) and the reverse reaction (red flashes) are observed