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

An investigation to show the effects of changing the concentration of hydrogen peroxide on the rate of catalyst

Extracts from this document...

Introduction

An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Title of investigation An investigation to show how the concentration of substrate affects the reactivity of hydrogen peroxide. Theory behind experiment The theory behind the experiment is to evaluate how our human bodies react with enzymes. They can be found in food products such as apple, yeast, liver. We used these products in our first preliminary experiment to see which ones would be most reliable for our further investigation. Prediction I predict that the results of this experiment will show that the higher the concentration of the hydrogen peroxide, the more gas will be produced from the reaction. This is because at higher concentration there are more molecules in the hydrogen peroxide, and there being more molecules in the substance means that the molecules are much more likely to collide. So the higher the concentration of the hydrogen peroxide the more gas will be given off, 20% concentration of hydrogen peroxide will give off the most gas and 5% concentration of hydrogen peroxide will give off the least gas is what I predict. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Aim The aim of my investigation is to find out if changing the concentration of substrate will affect the rate (speed) ...read more.

Middle

Yeast for the reaction. Scales to measure the amount of yeast on. A test tube holder for the test tube to stand on. A plastic measuring cylinder full of water to see how much water was lost from the oxygen being emitted. Delivery tube/bung for the oxygen to access through from the test tube to the measuring cylinder. A stop watch to time the experiment. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Method Weigh out 0.59g of yeast on the measuring balance. Add the yeast to a boiling tube. Measure out 4ml of hydrogen peroxide. Fill a measuring cylinder with cold water right to the brim. Get a piece of plain paper and slip it over the top of the measuring cylinder. Pick up a water trough. Fill it half full with cold water. Get some goggles to protect your eyes. Get a stop watch to time the length it takes to react. Get a bung and a delivery tube and attach them to each other. Get a pipette. Place your hand over the top of the measuring cylinder. Rotate it 180 degrees so it is upside down then place it in to the water trough. Carefully remove the paper from under the tube. Using the pipette measure out the hydrogen peroxide. ...read more.

Conclusion

If I had to make a change to do this investigation for the second time I would make sure the same person was putting the bung in the test tube and the delivery tube under the measuring cylinder so it was about the same time difference. I would measure the yeast more accurately as we may have added more or less at certain points which would have caused outliers. We would check that there were no air bubbles in the measuring cylinder. I think that to make my results more accurate and reliable the main thing that would have to be done is to cut down on human errors by making each test as similar as possible to make results more reliable .There isn?t anything else that would change the experiment drastically if it was altered. Time 10 20 30 40 10 20 30 40 Ml of h202 4ml 13 30 41 50 15 34 49 53 13 32 45 53 12 31 44 56 8ml 21 30 47 59 26 32 44 60 25 32 43 57 27 33 39 62 12ml 15 29 34 40 16 30 36 39 14 31 36 40 10 33 39 42 An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Lock & key hypothesis ...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 Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

3 star(s)

***
This account is only of average standard because not enough correct or specific scientific terminology is used.

Marked by teacher Adam Roberts 20/05/2013

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 Green Plants as Organisms essays

  1. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of ...

    5 star(s)

    when only its feet are touching the ground. As soon as other parts of the body touch a surface woodlice slow down and may even stop i. Thus it is important that I make sure that there are no objects in the plastic container that I intend to use for experiments.

  2. The effect of wind speed on the rate of transpiration.

    When the guard cells take in water, they become turgid but they cannot expand in diameter because the cellulose micro fibrils will not stretch. They therefore increase in length particularly along the thinner, outer walls. The outer walls stretch more than the inner walls, causing the cells to change shape and to form a gap between them.

  1. Factor affecting the rate of fermentation.

    * Use dropper pump some air into the cylinders, let all the cylinders are at the same water level. * Use another clam to hold the boiling tubes on the stand, and let the boiling tube surrounding by the warm water which has fill in the water bath.

  2. What effect does the sucrose concentration have on osmosis?

    towards it too quickly and the mass of the potato will increase too quickly. It should not be too low otherwise the potato will increase in size as the water molecules will move from the solution into the potato. I will control this variable by using the same concentration of sucrose in every experiment but will be changing the volume.

  1. An Investigation To Show What Different Factors Affect The Growth & Germination Of Cress ...

    I also noticed that the seedlings in the solution that lacked magnesium ended up with the darkest leaves. My research shows that a sign of a plant with a magnesium deficiency has yellow leaves.

  2. Effects of temperature on growth of yeast bread dough.

    into five different pieces (approx 60grams each). I will push these pieces to the bottom of five different measuring cylinders and will keep them at controlled temperatures in water baths. I will record the starting volume of the dough and will note how much the dough has risen after every five minutes.

  1. Investigating the Factors Affecting Respiration in Yeast.

    The syringe will contain 5cm of air and 5cm of the solution. The solution will be a mix of 2.5cm of the glucose solution and 2.5cm of the yeast suspension. Method 1st Part: Preliminaries Preliminaries are what I need to do before I carry out the actual experiment.

  2. Investigating the effect of concentration of sugar on the respiration rate of yeast

    in the sugar solution the water mixes with the sugar and so can not go back into the yeast through the tiny halls in the cell membrane as sugar particles are much larger than water ones. The apparatus used for this experiment is: � Water bath, to keep a constant temperature of yeast through out the tests.

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