Last modified: Mon 03/07/2011 05:08:44 pm
BCE for Introduction to Shifting Reactions B Exploration

Shifting Reactions B Exploration.

Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

First Name:

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Laboratory Section:

In this exploration you will collect some experimental data for a chemical reaction. However before doing the exploration we need to be sure your computer can view the simulation. Click here to bring up a new window with the simulation. If everything is working properly your window should look like Figure I.

Figure I.

In Figure I the Sample Region is the rectangular portion of the window showing the green and yellow/red particles.

If you have an empty window (or nearly empty) then the simulation can not run on your computer and you will need to follow some short instructions to accessorize your computer to view the animation(s).

If the IE browser window shows a boxed section with a small 'X' icon in the upper left corner, this means the simulation can not load due to the missing Java Runtime Environment (JRE) for IE. If there is any problem with the simulation window, you will need the more current version of the Java Runtime Environment for Windows. To get the latest version for your hardware, go to java.sun.com/ link to download the Java Runtime Environment (JRE) 6. On the next page loaded, you will have to accept the licensing agreement before you can begin the download. Select SE Runtime Environment 6 for Windows Platform. This will download to your computer and automatically accessorize IE so it will open the simulations. Depending on security policies you may need to contact your network administrator to assist in updating the JRE software for your computer.

If you have any difficulty following these instructions please contact Dr. John Gelder (john.gelder@okstate.edu).

Click on the Resume button. Start the reaction by clicking on the 'Enable Reactions' button. Watch the reaction as it occurs in the Sample region.

1. Write a balanced chemical equation that best represents reaction

2. Is the reaction reversible or non-reversible?

Site evidence to support your conclusion about the reaction's reversibility.

 

Continuing our study of the same reaction, click here to bring up a new window depicting the reaction in a graphical representation. If everything is working properly your window should look like Figure II.

Figure II

 

Click on the Resume button and allow the chart recorder to move so you can see the amounts of each substance as shown below in Figure III.

Figure III.

3. Provide the formula for the substance represented by each of the lines shown in the chart recording region beginning with the top green line down to the bottom yellow line.

Top line:

Next highest line:

Next line:

Bottom line:

4a. In the Table I below enter the amounts of RY, G, GR and Y into the cells in the Initial Concentration (the second) row.

Experiment #1 RY + G --> GR + Y
Initial Concentration - I  
Concentration Change - C  
Ending Concentration - E  

Table I.

b) In the reaction simulation window click on the Resume button and the Enable Reaction button to begin the reaction. When the reaction appears to be complete, click the Pause button to stop the action. Record the values of the ending concentrations (the fourth row) in Table I. (NOTE: Be careful to transfer the ending concentration of each substance into the correct cell in the table.)

c) Calculate the change in concentration of each substance in the reaction and record the value in the Concentration Change row in the Table 1.

5. In Figure IV below the chart recording from Question 4 has been labeled to identify three important regions. The regions are A, B and C.

Figure IV.

a) Which concentration (the initial concentration, the ending concentration or the change in concentration) does region A represent?

b) Which concentration (the initial concentration, the ending concentration or the change in concentration) does region B represent?

c) Which concentration (the initial concentration, the ending concentration or the change in concentration) does region C represent?

6. In Question 4 above you had paused the simulation. Without changing any other parameters in simulation change the amount of G to 0.75. Click the Resume button. Observe how the concentrations change. When the reaction appears to be complete, click the Pause button. Record the concentrations for this new experiment in the table below.

Experiment #2 RY + G --> GR + Y
Ending Concentration - E  

Following the addition of G, how do each of the reactants and products respond. Describe the change in the concentrations of RY, G, GR and Y.

How does the concentration of RY change?

How does the concentration of G change?

How does the concentration of GR change?

How does the concentration of Y change?

7. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

8. If there is one question you would like to have answered in lecture, what would that question be?