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

Investigation into the decomposition of hydrogen peroxide.

Extracts from this document...

Introduction

Biology Coursework-Investigating into the decomposition of hydrogen peroxide. Introduction I am investigating into how a certain factor alters the rate of decomposition in hydrogen peroxide. When yeast is mixed with hydrogen peroxide, bubbles of oxygen are produced. This is because hydrogen peroxide has been broken down into water and oxygen through a chemical reaction known as decomposition. The equation for this is: Hydrogen peroxide water and oxygen 2H2 O2 2H2O+O2 The rate of the reaction is determined by the enzyme in the yeast, catalase. This is an enzyme, which acts like a catalyst i.e. it speeds up what happens in the reaction; it is never used up in a reaction. In order to measure the speed of the reaction you apply the data to this formula: Speed of reaction=amount of oxygen made/time. Variables: * Temperature, * Concentration of enzymes, * Level of hydrogen peroxide. I will provide a brief explanation into each of the variables below: Temperature This variable will affect the rate of decomposition because, as the catalase enzymes in the yeast are heated, the molecules move around more, and collide into one another. Consequently, the hydrogen peroxide begins to decompose quicker. However, if you heat the enzymes beyond a certain point, the rate of decomposition in the hydrogen peroxide will slow to a halt. ...read more.

Middle

Method I will use the apparatus listed above in order to carry out my experiment. Firstly, I will prepare myself for the experiment so that I will be safe. I will tie my hair back, make sure there are no hazards around the workplace such as bags or stools and then I will put on my safety goggles. Then, I will proceed to set up my equipment by fixing up the sand and clasping the gas chamber and the separator in it. The separator is used so that no liquid will get inside the gas chamber, as the syringe would then stick and the results would be unreliable. I will then connect the separator to the bung which I will place in to my test tubes when carrying out the experiment. Then I will use the different measurements of yeast and hydrogen peroxide and place these into the test tube whilst quickly putting the bung in and starting the stopclock. The measurements I will use are from 1-10cm3.I I will then taking a reading off the gas chamber after a number of 10 second intervals i.e. at 10,20 and 30 seconds. However, in my pilot tests I will only collect my results after 30seconds. ...read more.

Conclusion

So, because the data all has quite strong positive correlation, this shows that the amount of oxygen produced is directly proportional to the amount of yeast enzymes. However, in every graph I can see that the very first result I took was considerably lower than the rest of the results. Each graph has this result as its single anomalous result. This anomaly was most likely to have been caused by a piece of the equipment. Perhaps it was the syringe that took a while to start moving, this could have been caused by a small amount of water getting trapped in the syringe making it stick. The only other thing in my method that could have caused unreliable or inaccurate data could be the fact that the timing of the experiment could not be absolutely accurate as I was using a stopclock to manually time it myself. Although, allowing for human error, I feel that my results, as shown, are overall very accurate. In order to improve my method in future I could use a data logger to time my results as this would be able to take a number of consistent more accurate readings. My graphs are clear and obvious, and give sufficient evidence to support my conclusion and prediction as everything in my method went as planned and I produced a set of plausible, accurate results. Biology Coursework Lauren Richardson 11G ...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. Factors Affecting the Rate of Catalytic Decomposition of Hydrogen Peroxide.

    Concentration: 10 VOL Volume: 10cm3 Catalyst: 0.5g Time (s) Mass of O2 gas given off (g) 5 0.12 10 0.16 15 0.15 20 0.16 25 0.16 30 0.16 35 0.16 40 0.16 45 0.16 50 0.16 55 0.16 60 0.16 Inference: catalyst amount more suitable but still needs to be

  2. The Decomposition of H2O2 using Catalase, in yeast as a catalyst.

    When the H2O2 has reached 20?C then the yeast is added. The bung is placed in boiling tube immediately and then timer must be started. A reading for the volume of O2 must then be taken every 15 seconds, and recorded.

  1. Effect Of Substrate Concentration On The Activity Of Catalase

    Boiling tubes are ideal for the reaction to take place in, as the volume of oxygen produced is quite small. Thus, it will be quicker for the oxygen produced to be able to displace the water in the measuring cylinder.

  2. In this investigation I will investigate the effect of the enzyme Catalase on Hydrogen ...

    so it is air tight when the reaction start (set up as above). I did some preliminary work on this experiment in order to find the best concentrations and best time range I could use for my own reactions. All the H2O2 that I used and I will use was and will be 100% solution 20 volume.

  1. To find out what factors affect the decomposition of Hydrogen Peroxide.

    These called the variables. These variables consist of the surface area, the concentration, and the use of a catalyst, the amount of the catalyst and also the temperature. Heat, light, or a catalyst can accelerate the reaction. * Surface area - If the Manganese Dioxide has a large surface area

  2. Investigation into the initial rate of hydrogen peroxide decomposition when the enzyme catalase is ...

    The idea that a substrate fits into the active site of an enzyme is called the 'lock and key' theory. As there is no inhibitor present I can presume that there will be nothing to obstruct the enzymes active site, as inhibitors, whether permanent or temporary, can slow a reaction

  1. The Effect of Catalase in the Breakdown of Hydrogen Peroxide

    Here is a table justifying my technique: Volume of H2O (ml): Volume of Concentration (ml): Percentage of Catalase (%): 0 10 100 1 9 90 2 8 80 3 7 70 4 6 60 5 5 50 6 4 40 7 3 30 8 2 20 9 1 10 10

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

    The heme group consists of a ring structure and a central iron atom. Catalase functions by the oxidation of iron without the heme group. The heme group is similar to those in the hemoglobin in the alveoli. The primary structure of catalase also contains an NADH molecule.

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