Last modified: Sun 01/17/2016 03:09:12 pm
BCE

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.

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In this BCE you will collect some experimental data for a chemical reaction. However before doing the BCE 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

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.

If you have any difficulty following these instructions please contact your instructor. Remember if you are unsuccessful in installing the JRE you can try a computer in a campus computer laboratory. You may need you ID to access the room to logon to the computer.

1. The reaction we are investigating in this simulation is

R + G ---> RG

According to the balanced chemical equation answer the following questions:

a) How many mol of G react with 1 mol of R?

mol

b) How many mol of RG are formed when 1.5 mol of R react?

mol

2. How many moles of R, G and RG are present initially (before starting the reaction)?

R: mol

G: mol

RG: mol

3. For the first experiment we will start with 0.5 mol of R, 0.5 mol of G and 0 mol of RG. By clicking on the slidebar for R, decrease its amount to 0.5 mol. Do the same for G (0.5 mol of G). Click the Resume button, then click the Enable Reactions button. Allow the reaction to proceed. When the reaction is 'finished' complete the Ending Amount row in table below;

 

R
G
---> RG

Initial amount

0.500

0.500

0

Change

Ending amount

Explain how you determined when the reaction was finished.

4. Return to the Table above and enter the Change row amounts.

5. Let's try another experiment. Click on the Reset button. This will reset the amounts to 1.0 mol of R, 1.0 mol G and 0 mol of RG.

Based on the first experiment make a prediction for the Ending Amounts in the table below.

 

R
G
---> RG

Initial amount

1.00

1.00

0

Change

Ending amount

6. Click the Resume button, then click the Enable Reactions button. Allow the reaction to proceed. When the reaction is 'finished' compare your prediction to the experimental Ending Amounts. How did you do?

7. Interesting...I am betting your prediction and the experimental Ending Amounts did not agree very well...? So what is going on?

Consider the two experiments...by what factor did the initial amounts change?

By what factor did the Ending amounts change?

8. Shall we try one more prediction? Based the initial conditions as shown in the table below, make your prediction.

 

R
G
---> RG

Initial amount

2.0

2.0

0

Change

Ending amount

9. Change the initial amounts for R and G in the simulation and Resume and Enable the reaction. How did you do?

10. Based on the two different reactions we have encountered so far (the one in class R + GB ---> RG + B) and this reaction...making predictions may appear to be a challenge. The question we might ask is...Is there some connection between these totally different reactions and the ending amounts? The answer is yes...an we'll discuss this in class on Tuesday!! I bet you can not wait!!

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

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