[EASY] Limiting reactants

Go to https://phet.colorado.edu/en/simulation/reactants-products-and-leftovers and download the simulation.

The purpose of this investigation is to understand the concept of limiting reactants and excess reagents.

Part I:

1. Click on “Sandwiches”.

2. You can play around with the “Cheese” and “Meat and Cheese” options to get a feel for the simulation but for your assignment, you will be choosing “Custom”.

3. Choose “Custom”. Decide, on the top of the screen, what type of sandwich you would like to make. For an example, 2 slices of bread was chosen + 1 slice meat + 1 slice cheese. It looks like this:

YOU CANNOT CHOOSE THIS SAME EXAMPLE. CHOOSE ANOTHER CUSTOM SANDWICH AND PUT IT IN THE DATA SECTION BELOW.

4. Now that your custom sandwich is chosen, you will move to the bottom of the screen and choose how many reactants you will have. Note that if you have zero reactants, you will have zero products. What reactants must you have to make one of your custom sandwiches with NO leftovers? Paste this scenario in the Data Section below. For the example custom sandwich, this would be the screenshot/snip.

5. Repeat Step 4 to make one sandwich with some leftovers.

Part II:

6. Go to the bottom of the screen and click on “Molecules”.

7. Choose (on the upper right side of the page) to make water, ammonia or methane.

8. For the reactants, put in the same number as the coefficients in the balanced equation at the top of the page. Paste your snip below in the Data Section.

9. Now, make both the reactants equal to 1. Paste your snip below in the Data Section.

10. Double the coefficients for both reactants and paste your snip below.

11. Choose any number for the coefficients of the reactants that has not been used above and paste your snip below.

Part III:

12. Click on “Game” at the bottom of the page.

13. Choose Level 1, 2 or 3. (HONORS Students must choose Level 3.)

14. Play the game and when satisfied with your score, screenshot/snip the score below in the Data Section.

Sample Score:

SAMPLE

The above example score would give you 18 out of 20 possible points. Try again if you don’t get the score you want!

Part I: (15 points)

Step 3: Custom Sandwich “screenshot” or “snip”.

Step 4: Screenshot/snip for 1 sandwich with zero leftovers.

Step 5: Screenshot/snip for at least one sandwich with leftovers.

Part II: (20 points)

Step 8: Screenshot/snip for number of reactants equal to the coefficients.

Step 9: Screenshot/snip for number of reactants equal to one.

Step 10: Screenshot/snip for double both the reactant coefficients.

Step 11: Screenshot/snip of your choice of number of reactants.

Part III: (20 points)

Step 14: Score for the game – must show level and score.

Complete the following statements: (15 points)

In order for there to be some product with no leftovers, then …

The leftovers in this simulation actually refer to the _______ in a chemical reaction.

The ______________ is the reactant that determines how much product can be produced.

(6 points each=30 points)

1. For Procedure Step 8, when the coefficients are equal to the number of reactants, what is true about the leftovers? Explain.

2. For Procedure Step 9, when the number of reactants are both one, is any product made? Are there leftovers? Explain.

3. For Procedure Step 10, what happened to the amount of product as compared to Step 8? Are there any leftovers? Why or why not?

4. For Procedure Step 11, did your choices yield any product? Why or why not?

5. For Procedure Step 11, did your choices yield any leftovers? Why or why not?

Save and Submit to 4.07 Limiting Reactants Investigation