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

To determine the relationship between surface area and rate of oxygen production when a potato is placed in hydrogen peroxide (H2O2) solution.

Extracts from this document...


Investigation To determine the relationship between surface area and rate of oxygen production when a potato is placed in hydrogen peroxide (H2O2) solution. Background Information Potato contains enzymes such as catalase. Catalase are protein molecules, which are found in animal and plant cells. Catalase speeds up specific reactions in the cells. They all have very specific duty, as each enzyme just performs one particular reaction. It is able to speed up the decomposition of Hydrogen Peroxide because the shape of its active site matches the shape of the Hydrogen Peroxide molecule. This type of reaction where a molecule is broken down into smaller pieces is called an anabolic reaction. Variables In my investigation I will have two types of variables:- a) Independent variables are variables that I can change. The independent variable for my investigation is: Surface area - the more surface area the more chance of collisions and therefore a quicker reaction. b) Dependent variable is the variable that is measured. In my investigation the dependent variable is: Volume of oxygen gas produced over a period of one minute Variables that I kept constant are: Temperature - the rate of reaction depends on the temperature as enzymes work best at certain temperatures. Concentration of Catalase (enzyme) - the more concentrated the quicker the reaction. ...read more.


I will then cut them into shapes with different surface are but the same volume. To be accurate I will cut the potato using a knife and a ruler. The dimensions of the potato I will be experimenting are (1 by 1 by 6), (1,1,3), (1,1,2), (1,1,1.5) and (1,1,1). Each of these shapes will be made by cutting the original potato size (1,1,6) into different sections. For example for the second dimension (1,1,3) I will cut the original potato size in half. Then I will put both the potatoes of dimension (1,1,3) into the chronicle flask. I will then measure 30cm3 of the hydrogen peroxide solution. Then I will pour the solution inside the chronicle flask and put the hydrogen peroxide in the test tube. Fill up the container with water and then fill the measuring cylinder up to the top with 20cm2 of water. Then I will join the delivery tube to the chronicle flask. Next I will put my hand over the top of the measuring cylinder and put it upside down in the container making sure that no air gets into the measuring cylinder. Then I will add the potato shapes to the 30cm3 of hydrogen peroxide. Then the reaction will start and I will put on the bung. ...read more.


There were some difficulties while I carried out this investigation which may have caused small anomles. It was very difficult to cut the potatoes into pieces, especially when it reached cutting the dimension 1 by 1 by 1. It was also hard to read the readings at exactly 1 minute because people have reaction time so this can delay the readings. Also when I was putting the potato chips into the chronicle flask, maybe two potato chips were sticking together, this would decreased the surface area which decreases the amount of oxygen produced. I need to keep the temperature constant throughout the whole experiment but it was difficult because this is an exothermic reaction, which means when its reacted, it gave out heat, so the temperature may have changed during the experiment. In order to improve my experiment, I can use an implement called thermostatically controlled water bath. This can keep the hydrogen peroxide in a constant temperature to make the experiment more fair and accurate. I can increase the size of the potato chip in order to help me to cut the chips into pieces more accurate and easier. Maybe I could increase the time to let the reaction react, so more oxygen will be produced, increasing the accuracy of the results. I could use a vernier calliper to measure the length of the chips instead of a ruler because this can provide measurements to 2 decimal places, therefore this would increase the accuracy of the results. ...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. find out if changing the surface area of a potato chip will have an ...

    This equation is correct up to the optimum temperature. After that temperature the number of bubbles produced halves itself each time 10oC is added, because the enzyme becomes too energetic and starts to denature. i.e. 40 = 8 = 2 i.e.2 60 = 3 = 0.5 30 4 50 6

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

    I predict that the more pieces or a bigger surface area of the potato that I use, the greater the amount of oxygen produced. The reason for this is because there is catalase on the surface of the potato; catalase is an extremely efficient enzyme, causing up to 200,000 reactions a second.

  1. Find out the volume of oxygen produced when placed in Hydrogen peroxide.

    Apparatus 1. Potato Crusher 2. Hydrogen Peroxide 3. Conical Flask 4. Stop Watch 5. Measuring Cylinder 6. strips of potato 7. syringe Method 1. Set up apparatus as shown on the previous page. 2. Draw out a results page, to mark on all of your results.

  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.

  1. An Investigation into the effect of substrate concentration (H2O2) on the rate of breakdown ...

    By using a water bath, the exothermic reaction's heat can be removed. Before the experiment I can make sure conical flask is completely clean, in order to ensure that there are as few other substances present within the experiment as possible, as well as making sure that the gas syringe moves smoothly.

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

    The pH of a potato is pH 7 as you can see from the graph below. As you can see from the graph above, if the pH of the experiment is between pH 1 and 6 (acidic), then the catalase enzyme can not work as fast compared to when the pH is 7, causing less products to be made.

  1. An Investigation into the effect of surface area on the activity of catalase in ...

    the hydrogen peroxide bubbling and foaming so much in the boiling tube that it started going up the delivery tube. As this would thereby affect my results in the collection of oxygen being released from the reaction taking place, I reduced the amount used.

  2. Examine how the concentration of the substrate Hydrogen Peroxide (H2O2) affects the rate of ...

    Measure the volume of oxygen evolved in a time of 5mins. 5. Repeat the procedure with the other Hydrogen Peroxide solutions. Be aware not to contaminate each solutions with one another, this will cause inaccurate results. 6. Repeat all he tests at least three times (Time dependent)

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