Bell Ringer
How does surface area affect a
chemical reaction?
Today’s Goal
I can apply my knowledge of
chemical reaction to the real world
experience of making fudge.
I can identify endothermic and
exothermic reactions in real world
situations.
Begin
Reactants
• 3 cups sugar
• 1 ½ sticks of country crock butter
• 2/3 cup of cream
• 1 (7 oz.) jar of marshmallow crème
• 1 (12 oz. package) of __________
chips.
• Energy
Recall that activation energy is
minimum amount of energy needed
to start a reaction.
The energy for today’s experiment
will come from the hot plate.
1. Explain how the energy gets from the
electrical outlet to the pan to heat the
reactants.
Next
In a pan
Mix the first 3 ingredients (reactants)
until they dissolve into one
(compound)
This will happen as the heat goes
into the pan (endothermic)
Look
Once they mix together to form a
compound OBSERVE the color of the
compound.
Record a description of your
observation.
At this point we observe for the
mixture to begin to boil. The mixture
must absorb enough energy to come
to a rolling boil. (It cannot be stirred
down) OBSERVE Record observation.
Now we begin to time. Time for 6
min. Then we will look at the color of
the compound.
Next
Time’s UP
We remove the compound from the
energy.
Add the (inhibitor) chips, and
marshmallow crème.
Mix thoroughly and immediately pour
in the pan.
This is where the exothermic part of
the reaction is taking place.
Feel the heat being released.
Let the majority of the heat be
released. When the fudge is cool we
can eat it.
While you are waiting!
Assignment
Write up this experiment.
Analysis
• Explain in detail how making fudge is
indeed a chemical reaction.
• Use the vocabulary words. (page 514)
or your homework (the vocabulary
model)
• The analysis must use science
vocabulary correctly.
• Terms to include: endothermic,
exothermic, reaction rate factors,
reactants, products, evidence of a
chemical change
• Be specific! Begin now while you wait to
eat your experiment.
• Analysis is due tomorrow. You may use your
notes, book, etc…
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