Last modified: Wed 03/09/2016 12:04:02 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

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 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/OS X. To get the latest version for your hardware, go to java.sun.com/ link to download the Java Runtime Environment (JRE) 8. Look for the initials JRE associated with JDK 8 Update ?? (current version). On the next page loaded, you will have to select a platform from the dropdown menu list and accept the licensing agreement before you can begin the download. Select the Windows Platform then click the Continue button. In the new window select the first option for offline installation of the JRE file(s). This will download to your computer and automatically accessorize IE so it ready open the simulations. Now follow these instructions to adapt your computer to Java applets.

If the Java dowload does not work (or all this accessorizing scares you) try the video (NOTE: Depending on your service provider the download may take a few minutes) of the experiment that I did today.


NOTE: If you want to learn a little more about this simulation and how to interact with it check out page 117 - 121 in you DCI manual. In the BCE we are doing a variation on the activity titled Shifting Reactions A on page 179. If you want to get a little ahead you are welcome to look at the Shifting Reactions A activity.

1. The reaction we are investigating in this simulation is

R + GB ---> RG + B

(Before the reaction begins/clicking Resume and Enable Reaction) 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 (or rewind the video) 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.

If the Java version is not working checkout the video of this experiment.

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?