The effect of temperature on the production rate of carbon dioxide in yeast.

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BIOLOGY COURSEWORK

The effect of temperature on the production rate of carbon dioxide in yeast.

Introduction:

We are using yeast balls to work out what affects the production of carbon dioxide. The reaction to be studied is as follows:

C6H12O6                         C2H5OH    +   2CO2    (+ 2 ATP)

There are four factors which affect the reaction rates : surface area, use of catalyst, concentration and temperature.

It is impossible to vary the surface area , as if the yeast balls were chopped up into small pieces, then the yeast inside would die, and so no reaction would occur. The use of catalysts is a hit-and-miss variable, as it is basically putting in random chemicals and seeing if they react. Both temperature and concentration are suitable for variation, but I have decided to change the temperature, as I do not think that varying concentration (i.e. amount of yeast balls), would be that effective.

Knowledge:

C6H12O6                         C2H5OH    +   2CO2    (+ 2 ATP)

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Since we are considering the effect of temperature on the reaction, all other variables (including number of yeast balls used and volume and concentration of the glucose solution) must be kept constant throughout.

                        Amount of precipitate formed

Reaction Rate =                        time

                              Extent of reaction

                 =                        time

When the glucose solution reacts with the yeast, carbon dioxide is formed. The amount of gas formed in a certain time can be used as an indicator ...

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