Name ____________________________________
Hour ______
Date ________________________
Reactants, Products, and Leftovers Simulation
Go to Mrs. Lee’s website > Honors Chemistry > Honors Chemistry Resources > PhET Simulations >
Chemistry > Reactants, Products, and Leftovers > Run Now!
Start in the “Sandwich Shop.”
1.
a. Predict (without using simulation) how many cheese sandwiches, as defined by the picture on the
right, you can make if you have 6 pieces of bread and 4 slices of cheese. ________
b. Use the simulation to check your prediction.
2.
a. Predict what would change about your number of sandwiches if you have the same 6 pieces of bread
and 4 slices of cheese, but the sandwich is made like the picture on the right. ________
b. Check your prediction.
3. The Chemistry Café owner ran out of bread. She went to the bakery next door and bought a loaf
containing 33 slices. After selling 12 sandwiches, how much bread did she have left over? ________
4. The Chemistry Café cook has a loaf of bread containing 33 slices and a package of cheese that has 15
slices. He is making sandwiches that have 2 pieces of both bread and cheese. How many sandwiches
can he make?________
Select the “Meat and Cheese Sandwich” option.
To make a meat & cheese sandwich, you need 2 pieces of bread, 1 piece of meat, and 1 piece of cheese.
Determine how many sandwiches you can make, how many leftovers you have, and circle the limiting
ingredient(s).
5. If you have 6 pieces of bread, 2 pieces of meat, and 2 pieces of cheese, how many sandwiches can you make?
_____ What will be leftover? _____ piece(s) of bread, _____ piece(s) of meat, and _____ piece(s) of cheese
6. If you have 6 pieces of bread, 10 pieces of meat, and 8 pieces of cheese, how many sandwiches can you make?
_____ What will be leftover? _____ piece(s) of bread, _____ piece(s) of meat, and _____ piece(s) of cheese
7. If you have 40 pieces of bread, 10 pieces of meat, and 20 pieces of cheese, how many sandwiches can you make?
_____ What will be leftover? _____ piece(s) of bread, _____ piece(s) of meat, and _____ piece(s) of cheese
8. Research the term “limiting reactant”. Write a description IN YOUR OWN WORDS and cite the
resources you accessed. (Ex: Grosse Pointe North High School http://gpschools.schoolwires.net/Domain/194)
Relating Sandwiches to Chemistry
Access the “Real Reaction” section of the simulation. Answer the questions and circle the limiting
reactant(s) for each.
9. Write the balanced equation for the synthesis of water below.
10. If we have 4 H2 molecules and 2 O2 molecule, how many molecules of water can we make? _____
What will be left over? _____ H2 molecule(s) and _____ O2 molecule(s)
If the moles of reactants are increased by a factor of 2, the moles of product
increase/decrease ________________________ by a factor of ________.
11. If we have 7 H2 molecules and 3 O2 molecules, how many molecules of water can we make? _____
What will be left over? _____ H2 molecule(s) and _____ O2 molecule(s)
12. If we have 20 H2 molecules and 40 O2 molecules, how many molecules of water can we make? _____
What will be left over? _____ H2 molecule(s) and _____ O2 molecule(s)
13. Predict which reactant amount would produce the most water with the least amount of leftovers.
a. ____ H2 molecules and ____ O2 molecules
b. Check your prediction using the simulation.
Select the “Make Ammonia” option. Answer the questions and circle the limiting reactant for each.
14. Write the balanced equation for making ammonia below.
15. If we have 3 N2 molecules and 9 H2 molecules, how many molecules of NH3 can we make? _____
What will be left over? _____ N2 molecule(s) and _____ H2 molecule(s)
If the moles of reactants are increased by a factor of 3, the moles of product
increase/decrease ________________________ by a factor of ________.
16. If we have 2 N2 molecules and 8 H2 molecules, how many molecules of NH3 can we make? _____
What will be left over? _____ N2 molecule(s) and _____ H2 molecule(s)
17. If we have 25 N2 molecule and 60 H2 molecules, how many molecules of NH3 can we make? ______
What will be left over? _____ N2 molecule(s) and _____ H2 molecule(s)
Select the “Combust Methane” option. Answer the questions and circle the limiting reactant(s) for each.
18. Write the balanced equation for combusting methane below.
19. If we have 4 CH4 molecules and 8 O2 molecules, how many molecules of CO2 can we make? _____
What will be left over? _____ CH4 molecule(s) and _____ O2 molecule(s)
20. If we have 3 CH4 molecules and 3 O2 molecules, how many molecules of CO2 can we make? _____
What will be left over? _____ CH4 molecule(s) and _____ O2 molecule(s)
21. If we have 5 CH4 molecules and 3 O2 molecules, how many molecules of H2O can we make? _____
What will be left over? _____ CH4 molecule(s) and _____ O2 molecule(s)
22. If we have 10 CH4 molecules and 30 O2 molecules, how many molecules of H2O can we make? _____
What will be left over? _____ CH4 molecule(s) and _____ O2 molecule(s)
Go to the Game!
Play the game with nothing hidden. When you get all 5 questions correct, call Mrs. Lee over.
The top three students with the best time and 100% correct will win extra credit!!
Submitting the Assignment
Save your “Reactants, Products, and Leftovers Simulation” and email it to Mrs. Lee as an attachment
(Kristen.lee@gpschools.org). In the subject line, type Stoich Simulation.