The Effect of Temperature on the Rate of Respiration in Yeast
Preliminary Experiment
Aim
To investigate the time it takes for the yeast in glucose suspension
to reach the same temperature as the water it is placed in.
Apparatus
=========
· Stopwatch
· Plastercine
· 2 Thermometers
· Ice Cream Tub
· Kettle
· Syringe
Method
======
· First I will fill up the ice cream tub with water at one of the
temperatures I would be using for the main experiment (80degrees will
be tested)
· Next I will check the temperature of the yeast in the syringe and
record it. The end of the syringe will be covered with plastercine so
none of the yeast will come out.
· Then I will place the syringe with a thermometer in it into the
water. The stopwatch will then be started.
· Every 30seconds the temperature of the water and the temperature of
the yeast will be recorded.
· When the water and the yeast reach the same temperature the
stopwatch will be stopped and the time taken will be recorded.
Prediction/reasoning
====================
I predict that the higher the temperature of water the longer it will
take for the yeast to reach that temperature. As the time goes on the
temperature of the water will drop quicker. This is because the water
cannot stay at a high temperature for a long period of time.
Preliminary Experiment Results
==============================
Time Taken in seconds
Temp. of Water (in degrees)
Temp. of Yeast (in degrees)
20
80
41
50
78
44
80
78
47
110
75
50
140
72
54
170
70
55
200
70
56
230
68
57
2. A test tube was then filled with 35ml of yeast and placed in the
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· I predict that the enzyme will work at its best at 37c because that
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