Apologia General Science Experiment 10.1 Factors That Affect Bacterial Growth

Apologia General Science Experiment 10.1 

Factors That Affect Bacterial Growth 

We mixed hot tap water with a chicken bouillon square.  Then we divvied up that water into four glasses.

We added the salt to one glass, the vinegar to one glass, left one glass alone, put one glass in the refrigerator, and added yeast to one glass....that last one was a mistake.  Dd had mixed up the different experiments we were to do during the week, and thought one glass was to have yeast added to it.  So, we put it up on the window sill to see how it would do with the rest of the glasses.

As you can imagine the salt and yeast got VERY cloudy as each day went by.  The chicken bouillon "fed" the bacteria already present in our glasses (and through the dust settling in the air).  As the bacteria was being fed it reproduced and multiplied.  As the bacteria grew, so did the cloudiness of our water.

After a few days we took a piece of paper and wrote "HELLO."  Then we put the paper behind each glass to determine how clear or cloudy each glass had become.  The glasses in the window sill seemed more cloudy than the glass in the refrigerator.  Our house was particularly hot, since it is late June and no air conditioning being on.  

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