• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

An Investigation of the Effect of Temperature On the Reaction Rate of Yeast

Extracts from this document...

Introduction

An Investigation of the Effect of Temperature on the Reaction Rate of Yeast? Results I used the results of the previous years experiments, there were 10 sets of results for a range of temperatures from 10 - 90* C. I put all these results into a table and decided to average the results fro a more accurate picture. I added up all the values for each temperature and divided by how many results there were. For temperatures where no observations were made I did not take an average and when plotted on a graph there were no points to mark at these temperatures. First I plotted a graph using the average volumes, I noticed the correlation was not as strong as I would have expected. I plotted a graph using the actual values of CO2 then found the anomalous results and calculated a new average discounting the incorrect results. ...read more.

Middle

My line of best fit showed a sharp curved correlation, peaking at around 50* and falling to zero at around 90*. However it also showed several points which were quite a way from the line of best fit and 90* seemed to high an end point for a reaction involving enzymes. My second graph showed the actual volumes of CO2 against temperature. I found that the line of best fit still followed a similar course but the end point of my curve was at 80 rather than 90*. This graph showed anomalous results clearly as they stood out from the clusters of values around my line of best fit. From his graph I was able to pick out 7 anomalous results. My third graph showed the adjusted average CO2 volumes, calculated without the anomalous results. These results formed a much stronger correlation than in my previous graphs and my line of best fit was much more like the type of curve I would expect form a reaction involving enzymes, peaking at around 50* and finishing at around 80*. ...read more.

Conclusion

There are many possible reasons for the anomalous results that I found, for example the measurements of temperature or mass may have been incorrect for that observation. There may have been an error when the result was recorded or the equipment may have been set up inaccurately. I f I was doing this experiment I would explore all the variables which may affect this experiment, temperature, mass, measuring errors and recording errors and, by doing preliminary work on the process, find out how best to keep the key factors constant. Overall my analysis of this experiment was accurate, effective and informative however it would be improved by improving the reliability of the results themselves. I also found that my analysis matched my conclusion, the enzymes had behaved as I expected them to , showing that my experiment was successful in proving it's aim. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. THE EFFECT OF BILE SALT ON THE ACTION OF THE ENZYME LIPASE

    From graph 1 we can see that as the concentration of bile increase the pH decreases, supporting earlier prediction because as you can see in 5% bile the at 120 seconds the pH drops to 7.9 this then continues to drop until 300 seconds were it reaches 7.2 pH this

  2. How temperature affects the rate at which bread dough rises and find out the ...

    And when a catalyst is added the energy need for the collision to take place is reduced and the reaction is then more likely to take place and again it is faster. Increasing the amount of yeast brings more enzymes and more active sites are filled so more products are formed faster and this speeds the reaction.

  1. The effect of temperature on the rate of reaction

    and is unlikely to change between testing * Pressure: does not really affect this experiment, and is unlikely to change between testing * Catalysts: does not really affect this experiment, and is unlikely to change between testing In addition to these steps, I am being careful about the amount of

  2. Coursework: Effect of Temperature on the Rate of Reaction between

    Temperature is the factor that gives the molecules the energy to collide more frequently at fast rates. This basically means they will be less time between each collision so the frequency of collisions will increase. If the collision occurs more frequently and violently, it will immediately result in an effective collision.

  1. Determine the effect temperature has on the rate of reaction.

    Discontinuous experiments use many separate experiments with different starting concentrations. These obtain one reading per experiment, e.g. clock reactions: thiosulphate and acid. b) Continuous experiments use one experiment and many different readings can be taken as the experiment goes on, e.g.

  2. To investigate the effect of varying the masses of white sugar and yeast and ...

    This procedure was repeated again for this mass of sugar and then done twice for the repetitions using 0, 4000, 6000, 8000 and 10000mg of yeast but all the other masses kept constant and the temperature kept at 27oC. 3.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work