Physical and Chemical S'mores
(adapted from Amy Rowley and Jeremy Peacock - stoichiometry of S'mores)
 
 Chemical Change of the marshmallow
Purpose:  In this laboratory experiment
        1. to be able to identify a chemical change in the marshmallow
        2.  to be able to identify the chemical formula of a marshmallow and how the formula has changed  (chemical equation)
 
Materials: (per group)
     wax paper                     triple beam balance               bunsen burner
      One marshmallow       bamboo sticks

Procedure
     1. Use the triple beam balance to Find the mass of the marshmallow.
     2. Find the mass of the wax paper first then add the marshmallow

    1.  Mass of Marshmallow:  _________grams

   3.  Cause the reaction to go to completion by forming as much as the product as you possibly can.
    4.  Use the triple beam balance to Find the mass of the decomposed  marshmallow.
    5.   Find the mass of the wax paper first then add the decomposed marshmallow

    2.  decomposed marshmallow ___________grams
 
 

Analysis

        1.    Write a balanced equation for the decomposition of sugar
 
 

       2.  We learned that in a chemical reaction, all mass is conserved.  When you measured the mass of the marshmallow and the decomposed marshmallow, did you find that the mass was conserved?  Explain why or why not.
 

 Physical Change
Discussion:
    Each of the S'mores ingredients, chocolate square(C), marshmallow(M), and graham cracker(G)
represent an element on the periodic table.  Graham crackers represents a diatomic elements, always found in pairs, and should therefore be represented as G_2.

the formation of a S'more: Take 1G + 1G + 1C + 1M  = s'more

We would end up with 2G(still graham Crackers) + 1C(change of state-melted -amorphous) + 1 marshmallow (only part that undergoes a chemical change)
 
Materials: (per group)
    3-4 small pieces of chocolate       wax paper          triple beam balance    bunsen burner
    3 or 4 marshmallows                      6-8 graham crackers                            bamboo sticks

Procedure

Prepare for s'more

• 2 graham crackers open on the wax paper
• 1 small chocolate piece on one of the graph crackers

• attach marshmallow to bamboo stick
• add heat to the marshmallow (place high over the bunsen burner)
• slightly decompose the marshmallow

• slide the slightly decomposed marshmallow off the bamboo stick on  the graham cracker with the chocolate piece
• place the other graham cracker on top of the slightly decomposed marshmallow
• make observation regarding any physical and chemical changes.

Which ingredient underwent a chemical change ______________________________

Which ingredient made no change at all  ___________________________________