• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10

How will whether the concentration of hydrogen peroxide when reacted with potato, determines the rate and volume of oxygen gas emitted?

Extracts from this document...


How will whether the concentration of hydrogen peroxide when reacted with potato, determines the rate and volume of oxygen gas emitted? Aim My task is to investigate whether the concentration of hydrogen peroxide when reacted with potato, determines the rate and volume of oxygen gas emitted. Background Knowledge Enzymes are complicated chemical substances found in all living things. They act as catalysts. A catalyst is a chemical substance, which speeds up a reaction but does not get used up during a reaction. Enzymes are made in cells and can be used up many times. Enzymes are specific, thus meaning that an enzyme, which acts on one substance, will not act on another one. Thus an enzyme, which breaks down proteins in to amino acids, will not break down starch into maltose. The shape of Enzyme A would determine which substance it would combine with, only a shape that exactly fits into enzyme A is adequate. Whereas it would not fit into enzyme B, therefore they are specific. Another reason is also a reaction occurs in stages: Starch > maltose (stage1) Maltose > glucose (stage 2) Each stage requires a different enzyme. The substance on which an enzyme reacts is called a substrate, which in our case is the hydrogen peroxide (H2O2). ...read more.


Remove bags from the area of experimentation. When using the scalpel, always take care, in cutting the chips. Always cut on a white tile, and hold them so that they will not move whilst cutting them. When using the cork borer, make sure your hand supporting the potato, is not in the way. Apparatus Stand, Boss, Clamp Test Tubes Scalpel White tile Stop Watch Delivery Tube Bung Measuring Cylinders Potato Hydrogen Peroxide Distilled Water Ruler (mm) Diagram Method 1. Set up experiment as in diagram 2. Place the potato on the white tile, and using a cork borer, extract 5 pieces of potato. 3. Place the 5 pieces of potato on the white tile, and measure their length. 4. Using a scalpel make each length 4cm. 5. Get 5 test tubes and label them 1-5, and using the table below, pour the correct amount of solution (using a measuring cylinder into them) regarding the test tube number. 6. Then start with test tube 1, and put a piece of potato in the test tube, start stopwatch, and replace the bung. After 30-second intervals, measure the volume of oxygen produced, by checking the amount of water in the measuring cylinder. 7. To test for oxygen, take a glowing splint and check if it relights when it meets oxygen from the measuring cylinder. ...read more.


Evaluation My graph and my results both agree with my prediction, however there are two anomalies, which show that my results and method were not accurate enough. But they both show that as concentration of hydrogen peroxide increases so does the rate of reaction. My prediction is correct. There may have been many experimental errors: Firstly, the length of all potatoes pieces may not have been accurate, due to the poor way in which I used the ruler, or the smaller less accurate scales. Another factor that could have affected the experiment is the time taken during replacing the bung, and the starting stopwatch. Also, the way in which the delivery t rube was held, made it bend and thus stop gas from To make the experiment a success, one could have used to people so that the process in replacing the cap is faster and thus less oxygen is loss. Another factor in which could have helped my experiment is the apparatus used, if a more accurate ruler, which measures in millimeters was used to give the length of potato. Also to improve my experiment, I would have taken more result, to improve the accuracy. To further my investigation, I would probably investigate the factors of surface area, and temperature. This would give me a wider perspective on enzymes and thus I could analyze it further. ...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. Marked by a teacher

    The aim of this investigation is to find out what effect pH has on ...

    4 star(s)

    * Grated Potato * Syringe * Paper * Pen * Spoon * Grater * Distilled water Method: * Gather the apparatus e.g. H2O2, pH solution 4.4, and potato etc * Grate the potato * Measure 3g of potato by putting the Petri dish on to the digital balance and setting

  2. The aim of this experiment is to demonstrate that the substrate Hydrogen Peroxide will ...

    Whilst using the scalpel, I also took care to hold this by the handle and not the blade, to prevent any accidents. I also ensured that any spillage on the surface was removed immediately by wiping up with paper towel and washing away with cold water.

  1. My hypothesis is that the higher the concentration of hydrogen peroxide the more catalase ...

    > Then I added the 0.2grams of yeast into the test tube containing the hydrogen peroxide and plugged the bung into the test tube. The oxygen gas produced would go through the delivery tube and into the measuring cylinder where I could measure the amount of water displaced.

  2. The aim of my experiment is to investigate how the mass of potato (concentration ...

    the experiment and they will not be able to be controlled with a lot of accuracy. Hydrogen peroxide is corrosive and irritant therefore, to ensure this experiment is carried out safely; I plan to wear goggles to protect my eyes from the hydrogen peroxide.

  1. Investigate how the surface area of the potato affects the amount of oxygen produced ...

    471 3 1413 5 5 5 5 392.5 4 1570 5 5 6 5.3 345.4 5 1727 7 7 6 6.6 314 6 1884 12 12 11 11.6 Fair testing: In order for the experiment to be as reliable and as accurate as possible, we must ensure that it is carried out in fair conditions.

  2. How does the concentration of hydrogen peroxide affect how the enzymes in potatoes work?

    Any water lost must be recorded. * Cut out all the potato chips that will be used for the experiment using a cork-borer and then use a scalpel to accurately measure the chips are all the same size. Record the size of the potato chip used so that future chips will also be that size.

  1. For my coursework I will be performing an investigation into an experiment using hydrogen ...

    At the bottom of the flask the reaction prematurely slows down Distorting the overall rate measurement and making the results uneven and Therefore inaccurate. Type of Potato: The type of potato used will affect the experiment because different types of Potato will contain different levels of Catalase, and may have different Ph Levels.

  2. For my coursework I had to study enzymes (catalysts) and the rate of reaction ...

    Aim My initial aim was to measure the volume of oxygen when the concentration of hydrogen peroxide is added to the enzyme (potato) and then subsequently decreased. Along with this I have many more aims which I wish to achieve they are as follows: - To identify the factors and variables and account for them.

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