What should be done to balance this equation?
Which are the products of this chemical equation?
OF2 + 2 HF → 2 F2 + H2O
In this first simulation, you will be modeling chemical reactions by making cheese sandwiches.
If we make a cheese sandwich according to the following equation - 2 Bb + Ch → Bd2Ch - what would we expect the sandwich to look like?
If we make a cheese sandwich according to the following equation - Bb2 + 2 Ch → 2BdCh - what would we expect the sandwich to look like?
Making a cheese sandwich can be represented by the chemical equation: 2 Bd + Ch → Bd2Ch
What does the “2” on the left side of the chemical equation represent?
Making a cheese sandwich can be represented by the chemical equation: Bd2 + 2Ch → 2BdCh
What does the “2” on the left side of the chemical equation represent?
A menu at a cafe shows a sandwich with the following formula: BdM2Ch
What would you expect the sandwich to have?
A menu at a Café describes a sandwich as: 3 pieces of bread, one meat and 2 cheeses.
What would you expect the sandwich formula to be?
The Café owner was out of bread. She went to the bakery next door and bought a loaf which had 33 slices.
If she then sells 12 sandwiches, which need 2 pieces of bread each; how much bread did she have left?
A limiting reagent is the reactant that is used up first in a chemical reaction. Limiting reagents are so named because they limit the reaction from continuing once they are gone, as there is nothing left for the other reactant to react with.
Think back to which was used up first, in the last two questions. Which was the limiting reagent in that scenario?
A tricycle factory gets a shipment with 400 seats and 600 wheels. Use your ideas about Limiting Reactants to explain how you would figure out how many tricycles can be made.
Don't just provide a quantity, also explain why that quantity would be made, what would be used up first, and what would be left over; apply the principle of limiting reagent to your answer.
Testing the Prediction:
In this simulation below, click the "molecules" button in the middle of the screen.
Set the number of reactants to match each image in #14.
Record the number of H2O molecules produced and the amount of H2 and O2 molecules left over.
Image A (5 H2 and 3 O2)
H2O Produced
H2 Remaining
O2 Remaining
Image B (5 H2 and 5 O2)
H2O Produced
H2 Remaining
O2 Remaining
Image B (3 H2 and 5 O2)
H2O Produced
H2 Remaining
O2 Remaining
Which amount of reactants produced the most about of water with the least amount of reactants left over?
The balanced equation for the production of water is: 2 H2 + O2 → 2 H2O
Look up a definition for "The Law of Definite Proportions" and explain why the area above the "Before Reaction" and "After Reaction" does not provide the choice to change the ratios of hydrogen and oxygen atoms as the simulation for cheese sandwiches did.
What should be done to balance this equation?
Which chemicals are reactants?
Which best describes the products of a chemical equation?
Is the reaction portrayed in the image balanced?
2 separate pieces of bread 
2 loaves of bread 
2 separate pieces of bread
2 loaves of bread
The Café cook has a loaf which had 33 slices and a package of cheese that has 15 slices.
If he is makes sandwiches that have 2 slices of bread and 2 slides cheese, how many sandwiches can he make?
In the previous question, which was used up first?
Predictions (do not use the simulation to make your predictions):
a.) How many cheese sandwiches, as defined by the picture below, you can make if you have 6 slices of bread and 4 slices of cheese.
b.) What would change about your number of sandwiches and thinking if you had the same 6 slices of bread and 4 slices of cheese, but the sandwich is made like the picture below?
Testing the Predictions (use the simulation to test the predictions):
c.) Go to the simulation (below), click "Sandwiches" and test your predictions.
For a.) in the 'Before "Reaction"' side, add 6 slices of bread and 4 slides of cheese.
For b.) in the blue area above, click "custom" then change the sandwich formula to
2 slices of bread and 2 slices of cheese. Then repeat the instructions for "a.)".
d.) For prediction a. (2 slices of bread and 1 slice of cheese per sandwich):
How many sandwiches were produced
Which was used up, first
Which was left over
Which was the limiting reagent:
e.) For prediction b. (2 slices of bread and 2 slices of cheese):
How many sandwiches were produced
Which was used up, first
Which was left over
Which was the limiting reagent:
Think about the above cheese sandwich instructions, recall these were tested above in #11 using the simulation.
Why did the number of sandwiches change even though the same types of ingredients were used? Consider what "limiting reagent" means (see the hint) the write a description of that in your own words using what was shown in the simulation as evidence (see your results of the prediction tests in #11),
Prediction - Molecules:
Examine the three images below (labeled, "A," "B," and "C").
Each image displays different quantities of the reactants that produce H2O (water).
Predict which reactant amounts would produce the most water with the least amount of reactants leftover at the end. Explain how your understanding of limiting reagents helped you figure this out.
A B C