Last modified: Mon 03/07/2011 01:19:38 pm
BCE for Introduction to Shifting Reactions A Exploration

Shifting Reactions A 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:

Last Name:

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 red and green/blue particles. At the top right of the Figure I shows a set of horizontal slidebars with the mol of each substance.

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).

1. The reaction we are investigating in this simulation is

R + GB ---> RG + B

Looking at the Sample Region describe the shape and color of each reactant.

R:

GB:

2. How many moles of R and GB are depicted in the reaction window initially (before starting the reaction)?

R: mol

GB: mol

3. Let's make a predicition before starting the reaction. If we assume the reaction goes to completion how many mole of RG and B are formed? (Remember the chemical equation in Q1 that describes this reaction.)

RG: mol

B: mol

Also predict how many moles of R and BG will remain after the reaction reaches completion?

R: mol

GB: mol

What is your reasoning for your prediction?

4. If you have played with the simulation in any way (that is fine) click on the 'Reset' button in the Button region so all of the variables are set to their default values. Be sure the simulation is dynamic (moving particles) and set the dropdown button in the Button Region so it reads 'Concentrations'. Now start the reaction by clicking on the 'Enable Reactions' button. Watch the reaction as it occurs in the Sample region. Watch the number of moles of reactants and products. Also watch the concentration chart.

When you feel the reaction is complete enter the moles of the reactants and the products. (NOTE: be sure to make the correct assignment when you read the values of the moles in the Control Bar region and enter their respective values below.)

R: mol

GB: mol

RG: mol

B: mol

5. Let's try one more experiment. Click on the Reset button. By clicking on the slidebar for R, decrease its amount to 0 (zero). Do the same for GB (0 mol of GB). Click on the slidebar for RG and increase its amount to 8 mol and increase the amount of B to 10 mol. (NOTE: if you have any problems with adjusting the amounts you can also click on the number for R, GB, RG or B and enter the amount from the keyboard. Click on the Enable Reactions button.

When you feel the reaction is complete enter the moles of the reactants and the products. (NOTE: be sure to make the correct assignment when you read the values of the moles in the Control Bar region and enter their respective values below.)

R: mol

GB: mol

RG: mol

B: mol

6. Now compare the mol of all species that you ended up with in Q5 with the mol of all species from Q4. Comment on the what you observe about these numbers.

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?