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

In my coursework I am investigating the rate of an enzyme action and what factors affect it. Enzymes are biological catalysts.

Extracts from this document...

Introduction

Factors affecting the rate of enzyme action (preliminary) In my coursework I am investigating the rate of an enzyme action and what factors affect it. Enzymes are biological catalysts. They speed up the chemical reactions which go on inside living things. Without them the reactions would be so slow that life would grind to a halt. The enzyme that we are going to use in the main experiment is called amylase. It is present in the following substances we used in the preliminary experiment: * Carrots * Potato * Apple In this experiment we are going to see which substance reacts better with hydrogen peroxide. Aim: To find out which substance which amylase reacts fastest with hydrogen peroxide. Key variables: As I have already explained above, I am going to change the variable of substance. However, I will keep all of the other variables at a constant level: * Temperature. * Stirring ( I will not stir any of the substances because it will be impossible to stir them exactly the same way) * Amount of substance (cm�) * Concentration of hydrogen peroxide. Prediction: I predict that the higher the concentration of hydrogen peroxide, the more froth will be produced. Scientific Knowledge: I know that the hydrogen peroxide will excite the amylase present in the substance, therefore giving them more energy to make more random collisions. The more random collisions there are, the faster the reaction will be. ...read more.

Middle

The amylase present in the potato reactions with hydrogen peroxide was far more than the carrots or the apples. Therefore, I am going to use potato in my main experiment. Factors affecting the rate of enzyme action (main) In my coursework I am investigating the rate of an enzyme action and what factors affect it. Enzymes are biological catalysts. They speed up the chemical reactions which go on inside living things. Without them the reactions would be so slow that life would grind life to a halt. The enzyme that we are going to use in the main experiment is called amylase. It is present in the following substances we used in the preliminary experiment: * Carrots * Pork( we didn't use this substance due to the fact we already know its capabilities). * Potato * Liver. ( We didn't use this substance due to the fact we already know its capabilities). We saw these substances react with a certain level of pH of hydrogen peroxide. To see the results see "preliminary experiment". However, in this experiment we are going to see the concentration of hydrogen peroxide. This is because we tested what kind of substance was added and we thought that it would be interesting to change the variable of pH. Key Variables: As I have already explained above, I am going to changes the variable of concentration. ...read more.

Conclusion

I will use goggles. To make sure I am safe from harm I will: * Stand up. * Tuck in my chair. * Remove loose clothing (i.e. blazer). * Tuck in my shirt and tie. To make sure that my investigation is a fair test I will not change of the variables only the one which I want to, which is to change the concentration of hydrogen peroxide. Results Concentration Trial 1 (mm) Trial 2 (mm) Trial 3 (mm) 20% 1 2 3 40% 4 4 6 60% 5 6 7 80% 7 6 8 100% 8 8 8 Analysis In my experiment I could have done five trials to make sure that ach of the results we got weren't rogue one's. I could have made better time keeping in the level of froth. I should have kept strict time keeping. Also, my potato could have been cut better. The potato wasn't cut exactly 1cm�. I should have done this because if I had done this, my results would be exact. Conclusion As we can see from my results the higher the concentration of hydrogen peroxide, the more froth is produced. This is because the amylase present in the potato reacts with hydrogen peroxide and reacts with the oxygen (which, in turn, causes frothing). The level of amylase present in potato is ideal because we can measure it with ease. The hydrogen peroxide gives energy to amylase molecules which makes them vibrate and get more collisions. This is what happens in a reaction. Barrett Downing 4CP Miss Pascal, 4S2 Miss Noone ...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

    Photosynthesis Coursework

    4 star(s)

    I am therefore going to perform the experiment at room temperature, checking the temperature frequently, in case the heat given off from the light should slightly raise the temperature, in which case I shall simply refill the beaker with more water after each experiment.

  2. Marked by a teacher

    Biology Coursework Enzymes

    4 star(s)

    * Fifthly I will add the measured amylase into the boiling tube with the starch solution and immediately start the digital stopwatch; also I will instantaneously add 2 drops of the amylase/starch solution into the second well of the spotting tile.

  1. Marked by a teacher

    Biology Coursework

    3 star(s)

    * Dry weight - weight of organism with no water, organisms have to be dead Continuous variation: gradual variation across population. Mitosis - cell division which produces genetically identical cells, is done for: * Growth * Replacement * Repair of older cells Steps: 1. Makes a copy of itself 2.

  2. Free essay

    Osmosis Coursework

    These cells will swell up and become turgid. This means osmosis will occur in these cells, and as a result the potato will increase in length and mass (weight). BEAKER B: In Beaker B there is 75% distilled and 25% salt solution.

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

    I then filled up a measuring cylinder and put my thumb on the top and placed it upside down in to the tub of water making sure the water in the measuring cylinder was full.

  2. HOW DOES TEMPERATURE AFFECT CATALASE ENZYMES?

    The action of a catalyst is called catalysis. Catalysts are used by chemists to speed up many chemical reactions that otherwise would take place too slowly to be practical. The exact mechanisms of catalytic actions are unknown, but some types of catalysis are thought to occur when reacting chemicals are adsorbed onto the surface of the catalyst.

  1. Osmosis Coursework

    This will cause water to pass out of the cell by osmosis. As the water passes out of the cell, the cell surface membrane starts to shrink away from the firm cell wall. The pressure potential is now 0 and the state of the cell is known as flaccid.

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

    PH PH is a very important factor in this experiment. If the solution is too acidic or alkaline, then the enzymes can automatically begin to denature. Eventually this will also stop the reaction from occurring, as the reactants will be unable to connect with the active sites in order to accomplish the products.

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