Smores Lab

Introduction: In this lab you will be finding the limiting reactant as well as the excess reactant. The reactant that is completely used up in the reaction is called the limiting reactant. The excess reactant is the reactant that is left over. Each group will be given C,M, and G2 to create an even amount of S’mores.

Materials: Chocolate

Marshmallows

Gram Crackers

A Scale

Plates

Heating Appliance

Procedure: 1. Count all the reactants

2. Divide the reactants evenly within the group

3. Mass the reactants

4. Mass the complete product

5. Mass the excess reactants

Data Collection: C+M+ G2 → CMG2

Chocolate

(C) Marshmallows

(M) Gram Crackers

(G2) Complete Product: CMG2

# of reactants given 2 8 4

# of reactants used to complete product 1 4 4 4 S’mores were made.

# of reactant to make 1 product 1 1 1 Each individual product had 1 chocolate piece, 1 marshmallow, and 1 gram cracker.

Mass of Reactants (g) 10.8 7.8 15.9 33.4

Mass of Excess Reactant 44.9 46.3 None left over

Data Analysis and Conclusion:

As shown in the table above the relationship between the single reactant mass and the product mass is that the single reactants added together equal to the product mass. In the experiment you needed 2 gram crackers, 1 chocolate and 4 marshmallow to make 1 complete product. There was 1 chocolate left over and 4 marshmallows. The limiting reactant is the reactant that is all used up. In this experiment the limiting reactant was the gram crackers because they were all used up and stopped each group from continuing to make more s’mores. The excess reactant in the experiment was both the chocolate and the marshmallows because they were still left over after the complete product

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