======Yeast Fermentation======


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**Alternative titles:** Balloon Fermentation
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====Summary====                   
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====Procedure====  
  - Dissolve a packet of active dry yeast in warm water as directed on the package.  
  - Label three bottles: “White Sugar,” “Brown Sugar,” and “Honey.” Add one tablespoon of the corresponding sugar to each bottle.  
  - Pour equal amounts of the yeast solution into each bottle and mix gently.  
  - Stretch a balloon over the opening of each bottle, securing it tightly with a rubber band if necessary.  
  - Place the bottles in a warm location to encourage fermentation.  
  - Observe and measure balloon circumference at regular intervals (e.g., every 30 minutes) for 1–2 hours.  
  - Record results, compare the rates of inflation, and determine which sugar produced the most carbon dioxide.  
  - Analyze whether the results support the hypothesis and consider further experiments.



====Links==== 
Fermentation and Yeast Experiment - Beverly Biology: 
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VIDEO_TITLE2 - Fermentation of Yeast & Sugar - The Sci Guys: 
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📄 Yeast Fermentation Experiment - Sarah McClelland: [[https://littlebinsforlittlehands.com/yeast-fermentation-lab/]]\\

====Variations====
  * Test additional sweeteners such as artificial sugar substitutes, corn syrup, or fruit juice.  
  * Compare fermentation rates at different temperatures (cold, room temperature, warm).  
  * Change the amount of sugar added to see how concentration affects fermentation.



====Safety Precautions====
  * Use warm water, not hot, to avoid killing the yeast.  
  * Do not taste or drink the yeast mixtures, as they are not safe for consumption.  
  * Handle glass bottles with care to prevent breakage.




====Questions to Consider====
  * Why does the balloon inflate during fermentation? (The yeast consumes sugar and produces carbon dioxide gas, which fills the balloon.)  
  * Which type of sugar produced the most carbon dioxide, and why? (Sucrose in white sugar is readily broken down, while other sugars may take longer due to composition.)  
  * How is yeast fermentation important in everyday life? (It is used in baking bread, brewing beer, making wine, and producing biofuels.)  
  * What might happen if oxygen were present during fermentation? (The yeast would undergo aerobic respiration instead, producing more energy and less carbon dioxide.)