Sunday, January 31, 2010

Cloudy Bacteria

Almost all our food has preservatives added.  This is to stop food from going bad.  But do preservatives really stop the growth of bacteria?

You will need:  salt, white vinegar, clear drinking glasses, chicken bouillon cube, measuring cup, measuring spoon, masking tape, marker.
  1. Dissolve 1 chicken bouillon cube in 1 cup of hot tap water.
  2. Pour the mix into 3 glasses. Each glass must have the same amount.
  3. Add 1 teaspoon of salt to a glass. Use  the masking tape to label the glass "salt."
  4. Add 1 teaspoon of vinegar to the 2nd glass. Label it "vinegar."
  5. Label the 3rd glass "control", because it won't have a preservative.
  6. Place the 3 glasses in a warm place.  Leave them for 2 days.  Discover which glass is cloudier.
What Happens:  The glass with the vinegar is clearer than the others.  The "control" is the most cloudy. 

  • The cloudiness is made from large amounts of bacteria.
  • The other two glasses have preservatives: therefore, are clearer than the control.
  • This is because the preservatives slow  the growth of bacteria.
  • Vinegar stops the bacterial growth the best.
  • Food preservatives are important to help stop food from going bad.  They stop the growth of molds and bacteria.

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