Name: _______________________ Pd: ______
Basic Stoichiometry PhET Lab
Let's make some sandwiches!
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?
Vocabulary: Before you begin, please define the following terms:
Limiting Reactant: ______________________________________________________________________
Excess Reactant: ______________________________________________________________________
Synthesis Reaction: ______________________________________________________________________
Combustion Reaction: ______________________________________________________________________
Mole Ratio: ______________________________________________________________________
Diatomic Molecule: ______________________________________________________________________
Mole: ______________________________________________________________________
Hydrocarbon: ______________________________________________________________________
Procedure: 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:
1. 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.
2. Take some time and familiarize yourself with the simulation.
3. Set the reaction to a simple mole ratio of 2:1:1
4. Complete the table below while making tasty cheese sandwiches:
Bread Used
Cheese Used
Sandwiches Made
Excess Bread
Excess Cheese
5 slices
5 slices
4 slices
3slices
2 sandwiches
1 slice
0 slices
6 slices
3 sandwiches
4 slices
