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Purpose:
Understand how energy production and waste material can cause or add to water pollution. Understand function of BOD and how oxygen concentration varies with temperature.
Summary:
Students will use a methylene blue indicator to study the effects of placing yeast into an enriched nutrient environment and an environment with elevated temperature. The students will relate the availability of oxygen to these changes in the environment and the overall impact on living organisms.
Objectives Links:
C. Human activities and the environment
Process Skills Checklist
Materials:
- 500 mL beaker
- three 100 mL beakers
- marking pencil
- 10 mL graduated cylinder
- clock
- hot plate
- four 20 mL test tubes
- stirring rod
- test tube rack
- yeast
- milk
- methylene blue
- thermometer
Safety Concerns:
Hot plate is extremely hot. Methylene blue is toxic and stains skin and clothing.
Revision Date:
Summer 2001
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