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Introduction

What Is the Optimum Temperature Of Respiration? Hypothesis I predict that the optimum temperature will be at 45c because the enzymes will be able to move around and collide together with the glucose, which causes a reaction that will cause carbon dioxide, energy and alcohol. If I was to use a cold temperature the enzymes wouldn't be able to have kinetic energy, it wouldn't cause a reaction between the enzymes and glucose so no carbon dioxide would be released. Background Information This experiment relates to respiration. Respiration is when food turns in to energy. Yeast=Living things. The process we are looking at is respiration. Yeast Glucose--->-->--> carbon dioxide + alcohol Dioxide + energy This is called ANAEROBIC REPIRATION but it does not involve oxygen. All enzymes are needed for a chemical reaction to take place. ...read more.

Middle

4. I will count the amount of bubbles which are let off in the time of one minute using the stop watch for each of the temperatures this is shown to be a fair test because the stopwatch is reliable. 5. These results will then be recorded in my results table . Safety Goggles have to be worn during the experiment just in case boiling water gets in to your eyes. Apparatus 1. Yeast 8.Water bath 2. Themometer 9.Troth 3. Stopwatch 4.5%glucose 5. Beaker 6. Spatula 7. Syringe Method At first all the apparatus were collected and set out ready to do the experiment. 1 spatula of yeast was taken and put in to beaker.5% glucose was added to the beaker and this was then stirred to perform a liquid. The liquid was then put in to the syringe and placed in to the troth of the water being at the temperature 30c.This water was taken out of the water bath because the water bath was set at that temperature. ...read more.

Conclusion

This is because the temperature is too hot so the enzymes alter shape so they wouldn't be able to collisions together to let off carbon dioxide. Evaluation My results show they are reliable as they follow a pattern. Therefore I didn't have any anomalous results this means that the method that I wrote must have been accurate and valid. If I was to do this experiment again I would make sure I tested it in the water bath and not in the troth as in the troth the water can always decrease in temperature but in the water bath the water stays the same temperature. Also if I was to do this experiment again I would also test it in the temperatures 61c 62c 63c 64c onwards as where as it has shown 60c was its maximum, we never tested the temperatures in between 60c and 70c so the pattern could have still increased. ...read more.

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