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

To determine if the increase of surface area of a potato will increase the amount of gas given off, when combined with hydro peroxide.

Extracts from this document...

Introduction

Biology coursework Aim To determine if the increase of surface area of a potato will increase the amount of gas given off, when combined with hydro peroxide. Hypothesis For this experiment I predicted that as the surface area is increased the amount of gas given off would increase. The reason for this prediction is because as more potato is exposed to the liquid around it there is more potato to react with. If it were whole with only around 4 sides for the hydro peroxide to come into contact with there would be less of a reaction because the inside of the potato can not be reacted with the liquid around it and therefore less gas, but by cutting the potato into more parts this gives more surface area to react with and if the experiment goes to plan this hypothesis should be correct. Scientific Background An enzyme is a large protein molecule that works by reacting with another compound called a substrate. In this case the enzyme is the potato and the substrate is the hydrogen peroxide. ...read more.

Middle

This was done every 60 seconds to see how much it increased by. These results were recorded by hand on paper. Analysis and Evaluation The results show an increase of oxygen every 60 seconds. This increase is by about 1 or 2 sometimes 3 cm3 per 60 seconds. This reflects on the graph as when a line of best fit is shown there is a straight shallow line increasing steadily as the surface area increases. This agrees with my hypothesis. As the surface area increases the more molecules of hydrogen peroxide can come into contact with the surface of the potato and therefore the more pieces of potato added to the hydrogen peroxide the faster the reaction will be and there for more oxygen will be released in a shorter space of time. The results are in my opinion very accurate as the experiment was repeated four times. The only minute inaccuracy in the measurements was the size of the potato chips measured only by a standard ruler. The experiment on the whole went well. ...read more.

Conclusion

Also there was a limited amount of time to complete the experiment and I feel more accurate results could have been obtained if more time was given. If I were to repeat this experiment the following changes would have been made. Firstly I would invest in more accurate equipment to get the results as clear as possible. Secondly more time would be made available, as the potato chips, if left, seemed to go on for a much longer period of time then the time available during the experiment and thirdly if enough time was given I would investigate the experiment further by adding more variables for example varying the temperature to see if it would speed up or slow down the reaction. Conclusion The experiment was a success as the results obtained were enough to prove my hypothesis and prove that the greater the surface area the more oxygen is released. This also proves how enzymes work as a catalyst and the more of the potato introduced the faster the reaction takes place. As any reaction the more of a catalyst you introduce the faster the result. I therefore conclude that the experiment has successfully completed my aim showing everything the practical was carried out for. ...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 Life Processes & Cells 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 Life Processes & Cells essays

  1. Investagating the Action of the Enzyme Catalase On the Surface Area of a Potato.

    the experiment did not affect the catalase enzyme, which could change the amount of oxygen collected. Also, I always made sure that each cube was cut into a shape of a proper cube and was 6cm3. Each cube was cut into 1cmx1cmx6cm, the surface area equalling 6cm3 so that it was fair on every experiment.

  2. Biology catalyst couursework

    around 4/5 cm3, then at the change from 0.8% concentration to 0.4% concentration it went down by 8 cm3. In my analysis of the results I must look back at my predications and test them against my results: My predictions I predicted that as the concentration of the Yeast solution decreases the amount of oxygen produced will also decrease.

  1. The Decomposition of Hydro Peroxide.

    Equipment: ~ Liver, cut into 1gram squares (use liver as it has a large amount of catalase) ~ Hydrogen peroxide ~ Hydrochloric acid (pH1) ~ pH 4 buffer ~ Distilled water (pH7)

  2. Hypothesis: Increasing the surface area of the potato cylinders will increase the number of ...

    These are: * pH * Temperature * Substrate concentration * Enzyme concentration Some of these will need to be either varied or kept constant to ensure that the experiment is a success. pH - Every enzyme has an optimum pH at which it works best at.

  1. find out if changing the surface area of a potato chip will have an ...

    Summary When the temperature is too warm the enzyme start to denature and loses its specific shape. This means it can no longer break down Hydrogen Peroxide because it no longer has its special shape therefore it can no longer react.

  2. Investigation to see how total surface area is related to oxygen given off.

    The cubes I will are 1cm x 1cm x 1cm. This gives a total Surface area of 6cm�. However since one of the sides is touching the bottom of the glass the total Surface Area is actually 5cm�. I will now explain why I am keeping some aspects of my experiment constant.

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