Difussion in Agar Cubes – Lab Report
Essay by Natsu Kakuren • September 27, 2016 • Lab Report • 529 Words (3 Pages) • 1,377 Views
DIFUSSION IN AGAR CUBES – LAB REPORT
Research question
What is the effect of temperature change on yeast fermentation?
Background
The rates of chemical reactions may affect by temperature. The purpose of this experiment was to test the effect of different temperatures on the rate of carbon dioxide production in yeast by measuring the fermentation rate. Yeast is good for this experiment because of its characteristic of alcohol fermentation.
Yeast fermentation:
C6H12O6---- 2CH3CH2OH + 2CO2 (+2ATP)
Hypothesis
If temperature has effect on yeast fermentation, the higher it is, the more CO2 produce will be produced. However, at some point the temperature can be too high and destroy yeast cells, causing gradually less carbon dioxide production.
Variables:
dependent: |
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independent: |
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controlled: |
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Controlling the variables
Type of solution | We put 1 spoon of sugar into 3 spoons of yeast and then add 3ml water. |
The solution temperature | We measure it with a thermometer and control it with achieve hot water from the lab office as soon as possible. The same amount of water in each beaker is also controlled. |
Time we start measuring | We measure this with a timer (± 0.5 s) |
The method of measuring the length of cube edges | We use the same ruler for all |
Apparatus and materials
- Yeast
- Sugar
- Ruler
- Beaker
- thermometer
- Timer
- Spoon
- Test tube
- water
Method
This is for one of the temperature.
- Add 3 spoons of yeast into test tube.
- Then add 1 spoon of sugar.
- Then add 3ml water
- Put the tube into the beaker with 20 degrees water.
- Immediately turn on the timer.
- Leave the tube in the solution for 1 minute.
- After the 1 minute had passed, take out the tube and measure the height of CO2 bubbles.
- Take notes.
Safety
Too much CO2 may lead the popping of the tube plug. The tube shouldn't point to people.
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