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 * Exothermic Reactions

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Educational Outreach


EXOTHERMIC REACTIONS

 * Educational Outreach
 * STEM Lessons
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In this Section
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 * STEM Lessons
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LEARNING OUTCOMES

A chemical reaction is a process that leads to the chemical transformation of
one set of chemical substances to another.  Chemical reactions are an integral
part of technology, of culture, and indeed of life itself.  An exothermic
reaction is a chemical reaction that releases energy by light or heat. It is the
opposite of an endothermic reaction. Expressed in a chemical equation: reactants
→ products + energy. This exercise will allow you to understand chemical
reactions, explain what happens during an endothermic reaction, explain the role
of a catalyst and make both quantitative and qualitative scientific
observations.


MATERIALS

 * A clean 16-ounce plastic soda bottle or large cup
 * 1/4 cup 20-volume hydrogen peroxide liquid (20-volume is a 6% solution, ask
   an adult to get this from a beauty supply store or hair salon, can also be
   purchased on Amazon)
 * 1/2 Tablespoon (one packet) of dry yeast
 * 1 1/2 Tablespoons of warm water
 * 1 tbsp Liquid dish washing soap
 * Food coloring (optional)
 * Small bathroom cup (approx. 2 oz) cup
 * Safety goggles and gloves
 * High temperature thermometer (we use Vernier LabQuest 2 eith temperature
   sensor)


HOW IT WORKS

Caution: Hydrogen peroxide can irritate skin and eyes.  Wear goggles and gloves.

 1. Carefully pour the hydrogen peroxide into the bottle or large cup. Take the
    temperature of the hydrogen peroxide and record the initial temperature in
    the data table below.
 2. Add 8 drops of your favorite food coloring into the bottle.
 3. Add about 1 tablespoon of liquid dish soap into the bottle and gently swish
    the bottle around a bit to mix it. You do not want bubbles to form.
 4. In a separate small cup, combine the warm water and the yeast together and
    mix for about 30 seconds.
 5. Now the adventure starts! Pour the yeast water mixture into the bottle (a
    funnel helps here) and watch the foaminess begin!
 6. 6. Track the change in temperature as a function of time. Record the first
    meeting as 1 min, then continue recording the temperature in minute
    increments over 5 minutes.

Scroll Right Scroll Left

Time

Initial

1 min

2 min

3 min

4 min

5 min

Temperaturę

 

 

 

 

 

 

 

 7. Make observations.

How does it work?

The foam you made is special because each tiny foam bubble is filled with
oxygen. The yeast acted as a catalyst (a helper) to remove the oxygen from the
hydrogen peroxide. Since it did this very fast, it created lots and lots of
bubbles

 8. Clean up. The foam produced is just water, soap, and oxygen so you can clean
    it up with a sponge and pour any extra liquid left in the bottle down the
    drain.

 


ADDITIONAL RESOURCES

 * Chemical Reaction Lesson Plan

Location
Innovation, Science, and Technology Building Room 2034
4700 Research Way
Lakeland, FL 33805
Contact
863-333-0833
outreach@floridapoly.edu
Also of Interest:
 * Engineering Technologist
 * Endothermic Reactions
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