Student Exploration: Le Chatelier's Principle

Name: Toe wells Date: 5-5-25 Student Exploration: Le Chatelier's Principle: Due 5/5 Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: chemical equilibrium, concentration, equilibrium, equilibrium constant, reaction quotient, reversible reaction Prior Knowledge Questions (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? Increase B. How will Gary's account change if he spends more than he saves? decrease C. What happens if Gary spends exactly as much as he saves? Stays 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 N*O_{2} 8 and Moles N_{2}*O_{4} 0. 1. Click Play () and observe the colliding molecules. What do you notice? The molecules are merging 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 (2) and set Moles N*O_{2} to 0 and Moles N_{2}*O_{4} 8. Click Play. What do you notice now? The molecules are disintegrating 3. When a reaction can proceed in either direction, it is a reversible reaction. Based on what you have observed, is the synthesis of N*O_{2} into N_{2}*O_{4} a reversible reaction? Explain. I know the Synthesis of NO2 into N204 is a reversible reaction because both the Foward traction blue flashes and the reverse reaction Activity A: Reversible reactions Get the Gizmo ready: Click Reset. Reaction 1 should be selected. Set Moles N*O_{2} 8 and Moles N_{2}*O_{4} 0. Move the Sim. speed slider all the way to the right. Question: What are the characteristics of reversible reactions? 1. Predict: Suppose you began with 8 moles of N*O_{2} in the chamber. What do you think will happen if you let the reaction go for a long time? N2oy would start to disappear caused by all the 2. Test Click Play. Select the BAR CHART tab and check that Moles is selected. Observe the bar chart for about 30 seconds. As time goes by, what do you notice about the bars representing moles N*O_{2} and moles N_{2}*O_{4} After a while, the bars do not move as much as at first 3. Observe: Click Pause(). Select the GRAPH tab. Click the (-) zoom control on the horizontal axis until you can see the whole graph. What do you notice? At first, the amount of Nazand N204 charge papidly, beter a white the amounts do not Charge as This situation, in which the overall amounts of reactants and products does not change significantly over Much time, is called a chemical equilibrium. 4. Record: On the BAR CHART tab, turn on Show data values. How many moles of N*O_{2} and N_{2}*O_{4} are there right now? Moles NO, 4.0 Moles N₂O, 20 5. Calculate: Suppose all the N*O_{2} molecules were synthesized into N_{2}*O_{4} Given the equation 2N O 2 right left harpoons N 2 O 41 how many moles of N_{2}*O_{4} would be produced? 4mares OPNZO 6. Experiment: Click Reset. On the INITIAL SETTINGS tab, set Moles N*O_{2} 0 and Moles N_{2}*O_{4} to 4. Click Play. Click Pause when the bars of the bar chart stop moving very much. A. List the current amounts of each substance: Moles 4.0 Moles N_{2}*O_{4} 2.0 N*O_{2} B. How do these results compare to starting with 8 moles of N*O_{2} ) The resulting amounts of Noz and 2044 in this experiment are very Simul ar to the results obtained when starting with Reproductive for any or Poth grana 2020 Europe All 8 moves Noz and O Moles N204