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

The data will be recorded by measuring the distance travelled by the first oxygen bubble after the set time of 10 seconds.

Extracts from this document...

Introduction

Data Recording: The data will be recorded by measuring the distance travelled by the first oxygen bubble after the set time of 10 seconds. There is a set time of 10 seconds because after this time of activity, the enzyme Catalase begins to degrade and therefore the rate of reaction becomes slower. The table will be set up in the following way: Test Number Concentration / % Distance Travelled / cm 1 100 2 100 Average 100 1 80 2 80 Average 80 1 60 2 60 Average 60 1 40 2 40 Average 40 1 20 2 20 Average 20 Volume must be kept the same of the overall solution otherwise different scaled will be presented i.e. more substrate than usual: the bubble will go further; the result is not reliable and cannot be used. Safety Precautions: H2O2 at 20 volume (100% for this experiment) is a significant irritant, if it contacts the eyes it could cause itching and could lead to eye damage, therefore goggles must be worn during all handlings of H2O2. ...read more.

Middle

So, a new set time of one minute was added before this limitation presented a problem. Results: Test Number Concentration / % Distance Travelled / cm 1 100 7.00 2 100 7.10 Average 100 7.05 1 80 5.00 2 80 5.40 Average 80 5.20 1 60 3.20 2 60 3.20 Average 60 3.20 1 40 2.50 2 40 1.70 Average 40 2.10 1 20 1.50 2 20 1.75 Average 20 1.63 The results were collected in the order suggested in the plan (100% descending to 20%, then 20% ascending to 100%) to eliminate the affects of room temperature change when an average was taken. As two results were taken for each concentration an average was calculated for the distance travelled, this will be analysed. Data Analysis: From the graphs it is possible to see the trend that, as predicted, as the concentration of substrate increases, the rate of reaction increases. The gradient for the graph of the first run of results is: 0.189 The gradient for the graph of the second run is: 0.198 The gradient of the graph showing the average distance is: 0.192 This shows a close similarity between the results. ...read more.

Conclusion

This was unavoidable because the rubber connector had to be tight to prevent further gas loss. Repeats were important here so that excess gas loss could be identified. An anomaly that relates to this limitation is in the 40% concentration test in the second run. It is possible that it may have taken longer here to attach the syringe. Due to uncontrollable gas escape the bubble would have gone less far if it took longer to attach the syringe and further if it took less time. In most cases the values for the first run and the second run do not vary by more than 0.2 around the average, so there is an uncertainty value on the distance travelled of ? 0.2cm, as shown by the error bars in the graph to show average. As all measurements were made by the guide on the syringe, there could have been an effect on the concentrations, if the syringe was not marked accurately there would be an inaccuracy in concentrations, therefore there is an uncertainty value of ? 0.1cm^3. This is shown as a horizontal error bar on the graph to show average. ...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. Free essay

    Close Your Eyes

    I closed my eyes and breathed in Danny's scent. *Dougie* Couldn't she see this was killing me? We'd just spent an amazing night together and now she was acting like it had never happened. Well, it had and it wasn't something that could just be forgotten.

  2. The effect of concentration on the activity of catalase.

    The structure of catalase is shown in figure 3. Hydrogen peroxide is decomposed by catalase. Hydrogen peroxide is a strong oxidising agent. Hydrogen peroxide is made up of the same elements as water and has a similar molecular formula to water except hydrogen peroxide has an extra oxygen atom and it is this factor that makes it a strong oxidising agent.

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