HW - 4/27/12 and Sample Data from the Yeast Respiration Experiment

The homework for the weekend is to complete Classwork 102.

Answer all of the following questions to the best of your ability on a separate sheet of looseleaf in complete sentences.

1. Restate your hypothesis clearly. Make sure it is specific and measurable.

2. Draw a clear data table complete with your observations from the experiment.

3. Draw conclusions based on your observations. Be thorough and use details.

4. Evaluate your hypothesis. Did the data support or refute your hypothesis? Support the evaluation of your hypothesis by referring to your observations.

5. Based on what you now know about factors that can affect fermentation in yeast, what recommendations can you make to ABC Bakery in order to maximize the doughiness of their bread products? (Remember, carbon dioxide and fermentation cause the doughiness.) Be thorough and use details.

6. Were there any changes that you would recommend to your procedure?  Explain.

Some sample data collected across classes...

- pH 4 - more CO2 in the balloon
- pH 7 - some CO2 in the balloon
- pH 10 - very little CO2 in the balloon

- 1 tsp. of sugar - some CO2 in the balloon 
- 1/2 tsp. of sugar - more CO2 in the balloon 
- 1/4 tsp. of sugar - more CO2 in the balloon 

- Temp. = 10 degrees C - very little CO2 in the balloon 
- Temp. = 24 degrees C - some CO2 in the balloon
- Temp. = 40 degrees C - more CO2 in the balloon  
- Temp. = 50 degrees C - more CO2 in the balloon
- Temp. = 60 degrees C - more CO2 in the balloon 
- Temp. = 70 degrees C - more CO2 in the balloon 
- Temp. = 80 degrees C - more CO2 in the balloon 
- Temp. = 90 degrees C - some CO2 in the balloon 
- Temp. = 100 degrees C - some CO2 in the balloon