   # Basic Stoichiometry Phet Lab

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Basic Stoichiometry PhET Lab rvsd 2/2011
Let's make some sandviches!
_
Introduction:
When we bake/cook something, we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs, or not enough sugar. YUCK! In chemistry, reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts, the reaction will produce products. What happens if there are more or less of some of the reactants present?

Procedure: Load the "Reactants, Products, and Leftovers" simulation by going to http://phet.colorado.edu/ or googling "phet." You may have to download or update the version of Java on your computer.
Complete each exercise on your own. Remember to use proper units and labels.
PhET Simulations _ Play with the Sims _ Chemistry _ Reactants, Products, and Leftovers_
If a yellow bar drops down in your browser, click on it and select "Allow Blocked Content"

Part 1: Making Sandviches: _
The _ is a simulation of a two-reactant synthesis reaction. In this case, one reactant will be limiting, while the other will be in excess.
Take some time and familiarize yourself with the simulation.
Set the reaction to a simple mole ratio of 2:1:1_
Complete the table below while making tasty cheese sandwiches:
Cheese Used
Excess Cheese

5 slices
5 slices
2 sandwiches
1 slice
3 slices

4 slices
3slices
2 sandwiches
0 slices
1 slice

5 slices
2 slices
2 sandwiches
1 slice
0 slices

6 slices
7 slices
3 sandwiches
0 slices
4 slices

Part 2: Real Chemical Reactions: _
_Now let's work with real chemical reaction, one that creates a very entertaining BOOM!
What is the mole ratio for the reaction of hydrogen and oxygen to produce water? The mole ratio is 2 to1 to 1_
Complete the table below while making water H2O from hydrogen H2 and oxygen O2:
Hydrogen Molecules H2
Oxygen

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