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Problem Statement: How can concentration changes affect a chemical reaction? I, Data Collection: EXPERIMENT # 1 : R BG RG B + + Initial Concentration-I 0.6 0.7 0.8 0.9 - 0.13 Concentration Change-C -0.17 - 0,17 0.17 Ending Concentration-E 0.43 0.53 0.97 1.07 Calculate the change in concentration of each of the substances in the reaction. In the space below, draw a plot of the concentration v. time and label the axes. Identify the chemical substance that corresponds to each of the lines. II. Data Analysis and Interpretation: +ime A. Mental Modeling: Draw pictures at the level of atoms and molecules that represent the initial and ending states of the reaction Initial Ending B. Explain what is happening to each of the reactant and product substances over time. How does the plot illustrate the changes you observe? It LYALW22uo2 2 C. How can you tell when the reaction is complete? What substances are present when the reaction appears to be complete? D. Considering the substances that are present when the reaction appears to be complete, why do the concentrations of the substances cease to change? III. Data Collection: EXPERIMENT #2: Increase reactant R to 2.0 M BG B RG + Initial Concentration-I 2.0 0.53 0.97 1.07 Concentration Change-C Ending Concentration- E 1.7 0.23 1.27 1.37 Calculate the change in concentration of each of the substances in the reaction. Draw a plot of the concentration v. time in a manner similar to the previous experiment. 1I1 EXPERIMENT #3: Increase reactant BG to 1.0 M BG RG B R + + 1.27 1.37 Initial Concentration-I 1.0 1.7 Concentration Change-C - 1.82 0.55 1.72 Ending Concentration - E 1.25 Calculate the change in concentration of each of the substances in the reaction. Draw a plot of the concentration v. time in a manner similar to the previous experiments EXPERIMENT #4 : Decrease reactant R to 0.75 M RG BG 4 1.72 1.82 Initial Concentration-I 0.75 0.55 Concentration Change-C Ending Concentration-E 0.87 0.68 1.60 1.70 Calculate the change in concentration of each of the substances in the reaction. Draw a plot of the concentration v. time in a manner similar to the previous experiments. it 4 Experiment #5: Increase product RG to 2.0 M RG B BG + Initial Concentration-I 2.00 1.70 0.68 0.87 Concentration Change-C 1.94 1.64 Ending Concentration-E 0.74 0.93 Calculate the change in concentration of each of the substances in the reaction. Draw a plot of the concentration v. time in a manner similar to the previous experiments. EXPERIMENT #6: Decrease product RG to 1.0M BG RG Initial Concentration -I 0.93 0.74 1.00 1,64 Concentration Change-C Ending Concentration-E 0.78 0.60 1.16 1.80 Calculate the change in concentration of each of the substances in the reaction. Draw a plot of the concentration v. time in a manner similar to the previous experiments. . 3 11 IV. Data Analysis and Interpretation: A. Summarize your observations of Experiments #3-#6 by completing the table below, As an example, the entries for Experiment #2 have been done for you. Reaction shift Change in [Products] Change in [Reactants] Experiment tress Add reactant [R] Concentrations decreased Concentrations increased Left to Right #2 #3 N4 #6 B. Consider the plot of concentration v. time for a hypothetical experiment [concentration] v, time 2 18 16 14 12 06 0.4 -R BG RG What was the stress placed on the reaction at time 2? Write an equation to describe this reaction, then set up and complete all the entries in an ICE table. 6 V. Conclusions: Review the summary of your experimental observations that you prepared in Section IVA, Write a statement(s) that generalizes how stressing a reaction by adding or removing a reactant or product shifts the chemical reaction. concentration v. time for a hypothetical experiment. Write an Modeling: Consider the Me equation to describe this reaction, then set up and complete all the entries in an ICE table. [concentration] v. time 16 14 12 10 6 0 -8 In the space below, draw pictures at the level of atoms and molecules that represents the progress of the hypothetical experiment from t-1 to t-2 to t-3. Indicate those particles that are added or subtracted from the sample as a result of the stress placed on the system. time 1 time 2 time 3 If you were to make a drawing for time 3? How would it be different? 4, how would it be similar to the drawing you made for time

Answer 1

Experiment #1:

The change in concentration of R = 0.43 - 0.6 = -0.17

The change in concentration of BG = 0.53 - 0.7 = -0.17

The change in concentration of RG = 0.97 - 0.8 = 0.17

The change in concentration of B = 1.07 - 0.9 = 0.17

Experiment #2:

The change in concentration of R = 1.7 - 2.0 = -0.3

The change in concentration of BG = 0.23 - 0.53 = -0.3

The change in concentration of RG = 1.27 - 0.97 = 0.3

The change in concentration of B = 1.37 - 1.07 = 0.3

Experiment #3:

The change in concentration of R = 1.25 - 1.70 = -0.45

The change in concentration of BG = 0.55 - 1.00 = -0.45

The change in concentration of RG = 1.72 - 1.27 = 0.45

The change in concentration of B = 1.82 - 1.37 = 0.45

Experiment #4:

The change in concentration of R = 0.87 - 0.75 = 0.12

The change in concentration of BG = 0.68 - 0.55 = 0.13

The change in concentration of RG = 1.60 - 1.72 = -0.12

The change in concentration of B = 1.70 - 1.82 = -0.12

Experiment #5:

The change in concentration of R = 0.93 - 0.87 = 0.06

The change in concentration of BG = 0.74 - 0.68 = 0.06

The change in concentration of RG = 1.94 - 2.00 = -0.06

The change in concentration of B = 1.64 - 1.70 = -0.06

Experiment #6:

The change in concentration of R = 0.78 - 0.93 = -0.15

The change in concentration of BG = 0.60 - 0.74 = -0.14

The change in concentration of RG = 1.16 - 1.00 = 0.16

The change in concentration of B = 1.80 - 1.64 = 0.16