Chemistry > STUDY GUIDE > Denver Senior High School - HIST 1111Student Exploration- Equilibrium and Concentration (ANSWER KEY) (All)

Denver Senior High School - HIST 1111Student Exploration- Equilibrium and Concentration (ANSWER KEY)

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Student Exploration: Equilibrium and Concentration (ANSWER KEY) Download Student Exploration: Equilibrium and Concentration Vocabulary: chemical equilibrium, concentration, equilibrium, equilibrium constant, reaction quotient, reversible reaction, Le Châtelier’s principle 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. Click Play () and observe the colliding molecules. 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. Click Reset (), and set Moles NO2 to 0 and Moles N2O4 to 8. Click Play. What do you notice now? 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. Activity A: Reversible reactions Get the Gizmo ready:  Click Reset. Reaction 1 should be selected.  Set Moles NO2 to 8 and Moles N2O4 to 0.  Move the Sim. speed slider all the way to the right. Question: What are the characteristics of reversible reactions? Predict: Suppose you began with 8 moles of NO2 in the chamber. What do you think will happen if you let the reaction go for a long time? Test: Click Play. Select the BAR CHARTtab 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 NO2 and moles N2O4? 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? https://www.coursehero.com/file/42224639/Student-Exploration-Equilibrium-and-Concentration-ANSWER-KEYdocx/ This study resource was shared via CourseHero.com This situation, in which the overall amounts of reactants and products does not change significantly over time, is called a chemical equilibrium. Record: On the BAR CHARTtab, turn on Show data values. How many moles of NO2 and N2O4 are there right now? Moles NO2 __________ Moles N2O4__________ Calculate: Suppose all the NO2 molecules were synthesized into N2O4. Given the equation 2NO2 ⇄ N2O4, how many moles of N2O4 would be produced? ____ ___________ Experiment: Click Reset. On the INITIAL SETTINGStab, set Moles NO2 to 0 and Moles N2O4 to 4. Click Play. Click Pause when the bars of the bar chartstop moving very much. List the current amounts of each substance: Moles NO2 __Moles N2O4 ___ How do these results compare to starting with 8 moles of NO2?

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